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Wednesday, July 30
 

8:59am CDT

Undergraduate Student Poster Competition - Session 1
Wednesday July 30, 2025 8:59am - 10:00am CDT
Please be at your poster at 9:00 AM.  Once the judges come to you to hear your presentation, please confirm with them that it is okay to leave.
Wednesday July 30, 2025 8:59am - 10:00am CDT
Empire AB

9:00am CDT

UG 1 - Effect of Temperature, Smoke, and Chemical Treatment on Germination of White Sage
Wednesday July 30, 2025 9:00am - 10:00am CDT
White sage, Salvia apiana, is native to coastal areas of southern California and northern Baja California. Leaves and stems of white sage are ceremonially burned in many indigenous communities, and the plant has additional culinary and medicinal importance. While white sage is not endangered, over-harvest of wild sage is of concern for conservation efforts. Propagation of white sage is generally accomplished by seed; however, germination is poor with rates ranging from 10 to 25 percent. This project evaluated application of heat and smoke treatment for their impact on germination. Temperature and time of exposure were found to significantly impact germination with treatment at 70C and 85C leading to increased germination at 21 days. Application of smoke originating from charcoal and burned sage did not impact rate of germination in seed not exposed to heat treatments.
Speakers
SS

Sam Sarratt

University of Nebraska-Lincoln
NA
Co-authors
CE

Christian Elowsky

University of Nebraska-Lincoln
NA
RS

Ronald Stephenson

Plant Sciences Hall
Wednesday July 30, 2025 9:00am - 10:00am CDT
Empire AB

9:00am CDT

UG 1 - Genome Size Estimation of Eight Thimbleberry (Rubus parviflorus) Populations Across the United States
Wednesday July 30, 2025 9:00am - 10:00am CDT
Thimbleberry (Rubus parviflorus) is a shrub native to the western temperate regions of North America, from Alaska to California and the Rocky Mountains. Despite its ecological importance and broad native range, genomic information for this species remains extremely limited. So far, only one flow cytometry data point is available for thimbleberry, reporting a haploid nuclear DNA content (C value) of 0.28 pg, which suggests a haploid genome size of approximately 270 Mb. The Rubus genus exhibits a broad range of ploidy levels, such as from diploid to dodecaploid (2n = 2x = 14 to 2n = 12x = 84) for blackberries (R. argutus). Genome size variation has also been documented in other shrub species. In plants such as Chrysanthemum indicum, Linum suffruticosum, and Lycoris radiata, changes in ploidy levels have been associated with environmental stress. Given the wide native distribution of thimbleberry, we hypothesized that genome size variation may exist among different thimbleberry populations. The aim of this study was to estimate the genome size of eight thimbleberry populations collected from various locations across the United States, including the Northwest, Midwest, Southwest, and Rocky Mountains, using a flow cytometer. The findings from this study provide baseline genomic data that can support future research efforts, such as the construction of a reference genome and investigations into ploidy variation and its potential relationship with environmental stress tolerance.
Speakers
ST

Stirling Todd

Utah Valley University
Co-authors
CH

Carl Hjelmen

Utah Valley University
NA
MR

Michael Rotter

Utah Valley University
NA
YL

Yuya Liang

Utah Valley University
NA
Wednesday July 30, 2025 9:00am - 10:00am CDT
Empire AB

9:00am CDT

UG 1 - Genomic exploration of WUS and BBM in challenging-to-culture blueberry varieties
Wednesday July 30, 2025 9:00am - 10:00am CDT
Blueberry breeding faces substantial challenges in efficiently producing plants with desired traits through traditional methods, limiting the industry's ability to meet increasing demands. Tissue culture (TC) and regeneration methods, while promising, are hindered by high costs, cultivar-specific outcomes, and unpredictability. Recent research has identified the significant roles of morphogenic genes such as WUSCHEL (WUS) and BABY BOOM (BBM) in shoot regeneration, early shoot formation, and transformation processes. This study investigates the gene morphology and function of native BBM and WUS genes in various Vaccinium corymbosum (highbush blueberry) varieties exhibiting different levels of tissue culture recalcitrance. Previously, we identified the locations of WUS and two BBM gene variants (BBM1 and BBM2) in blueberry transcriptome data, followed by primer design, PCR, and Sanger sequencing. BBM variants and WUS were analyzed in blueberry varieties ‘ONeal’ and ‘Legacy,’ which are capable of propagation via TC, and ‘Pinnacle,’ ‘NC 4499,’ and ‘NC5271,’ which lack transcriptome data and are known to be recalcitrant to TC. Initial WUS sequencing revealed a three-nucleotide deletion in the hard-to-culture varieties ‘NC4499,’ ‘NC5271,’ and ‘Pinnacle,’ resulting in the loss of a single amino acid. Additionally, two non-synonymous SNPs with high mutation rates were identified in ‘Pinnacle’ and ‘NC5271.’ To further investigate the impact of these genetic differences, we conducted protein sequence analysis to determine how the codon deletion in WUS affects protein structure. This could uncover potential alterations in protein folding or function, which may contribute to reduced regenerative capacity in recalcitrant varieties. We are currently working to extract RNA from the five blueberry varieties at different growth phases for cDNA synthesis and qPCR to investigate gene expression levels and copy number. This project aims to address a critical gap in blueberry cultivation by uncovering the genetic basis for propagation challenges in high-value varieties. By focusing on the WUS and BBM genes, the study seeks to identify genetic variations contributing to TC resistance, informing future genetic and breeding strategies.
Speakers
EW

Ellen White

North Carolina State University
NA
Co-authors
HA

Hudson Ashrafi

North Carolina State University
NA
Wednesday July 30, 2025 9:00am - 10:00am CDT
Empire AB
  Poster, Undergraduate Student 1
  • Poster # csv
  • Funding Source NCBiotech and NC State University Genetics and Genomics Academy

9:00am CDT

UG 1 - Horticulture-Based Organic Agroforestry to Prevent Soil Erosion and Forest Fire, and to Keep the Humans and Mother Earth Healthy
Wednesday July 30, 2025 9:00am - 10:00am CDT
Agroforestry is the intentional integration of trees and shrubs into crop and animal farming systems to create environmental, economic, and social benefits. It helps prevent soil erosion by stabilizing the soil with tree roots, reducing wind and water runoff, and protecting the soil. Trees also mitigate forest fire risks by creating buffer zones and improving soil health by adding organic matter, enhancing water retention, and promoting beneficial microbial activity, which boosts soil fertility and Soil erosion and forest fires are significant global conservation challenges. This sustainable approach fosters synergies between plant and animal species to enhance biodiversity, prevent soil erosion, improve soil health, and increase farm productivity. The objective of this research is to evaluate the effects of a horticulture-based agroforestry system in preventing wind erosion, enhancing soil nutrients, improving soil quality, and increasing crop yields. Horticulture-based agroforestry refers to land-use systems where herbs, shrubs, and trees are grown for food on the same land unit without livestock. It is a mixed cropping system with annuals, biennials, and perennials, providing financial, environmental, and health benefits. This long-lasting conservation farming system includes cereals, fruits, vegetables, tubers, nuts, legumes, spices, and condiments. This agroforestry system will provide carbohydrates, protein, minerals, vitamins, anthocyanins, and flavonoids to the farming community. It is practiced in Asia and Africa for the economic sustainability of small farmers and the provision of nutritious foods. In our farming system, annual and biennial vegetables, muscadines, blueberries, corn, legumes, cover crops, ginger, cocoyam, and turmeric are raised. This agroforestry research program is the first of its kind in the nation, focusing on horticultural crops where pecans are tree crops. Five acres of land on Memphis Silt Loam soil were divided into five blocks for pecans, vegetables, muscadines, blueberries, spices, and condiments. The tree rows are widely spaced, with a plant-to-plant distance of 13.7 meters and a row-to-row distance of 27.4 meters, to prevent forest fires. Inter-cropping, inter-planting, mixed cropping, and cover cropping are practiced with organic manures for nutrient management and soil erosion prevention. Randomized complete blocks (RCBD) and completely randomized designs (CRD) were used to raise perennial crops with organic treatments. The C-factor research technology, developed by Alcorn State University in collaboration with USDA scientists, evaluates growth parameters including upper and lower biomass development once every 15 to 20 days. Soil samples at 15cm deep are collected every year to assess soil health, promoting economic and environmental sustainability.
Speakers
ET

Ellis Terrett

Alcorn State University
Co-authors
GP

Girish Panicker

Alcorn State University
Dr. Girish Kumar Panicker, Professor of Plant and Soil Sciences and Director of Conservation Research, at Alcorn State University, Mississippi, is an authority on cover and management (C-factor) research on horticultural crops and is an internationally renowned agricultural scientist... Read More →
WM

Willis Mims

Alcorn State University
NA
Wednesday July 30, 2025 9:00am - 10:00am CDT
Empire AB
  Poster, Undergraduate Student 1
  • Poster # csv
  • Funding Source Alcorn State University

9:00am CDT

UG 1 - Seed Propagation of Blue Elderberry (Sambucus cerulea)
Wednesday July 30, 2025 9:00am - 10:00am CDT
Blue Elderberry (Sambucus cerulea) is a fruiting plant native to Western North America, ranging from British Columbia to Northern Mexico, and from Oklahoma to California. Like the black-fruited S. nigra and S. canadensis, it has the potential to be an important alternative crop. However, S. cerulea is more difficult to asexually propagate, and requirements for seed germination are not well understood. Seeds from 5 Utah selections and 2 commercial black-fruited cultivars were collected during the 2023 and 2024 harvests to determine optimum stratification requirements. No germination occurred before 12 weeks of stratification at 2°C for any genotypes tested. Optimum stratification period differed among genotypes and ranged from 18 to 24 weeks. Germination rates also varied by genotype ranging from 13% for a wild-collected population to 63% for a selection established in a common experimental orchard. Possible correlation between seed stratification requirement and other phenological development indicators (time of budbreak, bloom and fruit ripening) is still being determined. Information on propagation and climatic adaptation will be important in developing S. cerulea as an alternative crop and identifying suitable locations for commercial production.
Speakers
SS

Stephanie Spencer

Utah State University
Co-authors
BB

Brent Black

Utah State University
KK

Kaylee Kowallis

Utah State University
NA
LY

Lauren Yardley

Utah State University
NA
Wednesday July 30, 2025 9:00am - 10:00am CDT
Empire AB
  Poster, Undergraduate Student 1
  • Poster # csv
  • Funding Source Utah State University

9:00am CDT

UG 1 - Soil Composition Effects on Growth and Physiological Performance of Dragon Fruit (Selenicereus undatus) Under Greenhouse Conditions
Wednesday July 30, 2025 9:00am - 10:00am CDT
Selenicereus undatus (dragon fruit) is a high-value crop experiencing increasing global demand, yet limited research exists on how soil composition influences its growth and physiological performance. This study evaluated the effects of five distinct soil substrates on two dragon fruit varieties under controlled greenhouse conditions. 120 plants were arranged in a completely randomized design with five replications per treatment. The five soil treatments included Native South Texas Soil, 100% Sandy Soil, Sandy Soil 25% Sphagnum, Sandy Soil 50% Sphagnum, and 100% Sphagnum. Initial and final analyses of soil pH, salinity, texture, and nutrient content were conducted to monitor soil dynamics. Shoot length was measured at 0, 30, 60, and 90 days, while root biomass and architecture were assessed at harvest. Physiological traits, including chlorophyll concentration and total biomass, were also recorded at the conclusion of the experiment. Results revealed that soil composition influenced both above- and below-ground growth, with soils amended with sphagnum showing moderate increases in shoot elongation and chlorophyll content compared to unamended sandy and native soils. Root development varied across treatments, though no statistically significant differences in total biomass were detected. Variations in soil pH and organic matter content appeared to correlate with some physiological markers, suggesting a complex interaction between soil properties and plant response. While additional studies are needed to explore long-term productivity and fruit quality, these findings provide preliminary insights into how soil amendments may influence early-stage development of dragon fruit. This work contributes to ongoing efforts to optimize substrate management for dragon fruit cultivation, particularly in regions with poor native soils, such as South Texas.
Speakers Co-authors
LR

Lorenzo Rossi

Texas A
Dr. Rossi’s research program focuses on understanding the responses of horticultural crops to environmental stresses, with the goal of developing environmentally sound and effective management strategies. He is a horticulturist with expertise in plant stress physiology, plant biology... Read More →
Wednesday July 30, 2025 9:00am - 10:00am CDT
Empire AB

9:45am CDT

Coffee Break
Wednesday July 30, 2025 9:45am - 10:15am CDT
Wednesday July 30, 2025 9:45am - 10:15am CDT
Empire AB

10:00am CDT

Complimentary Seated Massage
Wednesday July 30, 2025 10:00am - 4:00pm CDT
Take a moment to relax and recharge with a complimentary seated massage in the exhibit hall! Offered exclusively to conference attendees, this refreshing experience is available on a first-come, first-served basis, so be sure to stop by early. Whether you need a quick escape from the hustle and bustle or a moment to unwind between sessions, our skilled massage therapists will help melt away tension—leaving you refreshed, reenergized, and ready to make the most of your time at the conference. Don't miss out on this perfect opportunity to treat yourself!
Wednesday July 30, 2025 10:00am - 4:00pm CDT
Empire AB

10:29am CDT

Undergraduate Student Poster Competition - Session 2
Wednesday July 30, 2025 10:29am - 11:40am CDT
Please be at your poster at 10:30 AM.  Once the judges come to you to hear your presentation, please confirm with them that it is okay to leave.
Wednesday July 30, 2025 10:29am - 11:40am CDT
Empire AB

10:30am CDT

UG 2 - Achieving Faster Pepper Hybridization Potential by Light Intensity and Duration Manipulation
Wednesday July 30, 2025 10:30am - 11:40am CDT
Chile peppers (Capsicum spp.) have traditional breeding cycles requiring hybridizations and then multiple generations of backcrossing and/or inbreeding, over several years, to establish genetically stable cultivars. Accelerating breeding cycles is essential to address global agricultural and industrial demands. Light conditions, specifically photoperiod length and luminous intensity, play a crucial role in plant development and serve as key factors in optimizing breeding efficiency. This study examines the effects of manipulating photoperiod and light intensity on four C. annuum genotypes: NuMex Lotalutein, NuMex Odyssey, NuMex Las Cruces, and Early Jalapeno. There were 5 plants per genotype per treatment, one treatment being normal greenhouse conditions and another a growth chamber with LED grow lights. Plants were monitored for key growth and developmental metrics, including germination speed and rates, and days to flowering. The measurements were recorded and analyzed using Tukey’s HSD in R (⍺ = 0.05). Results indicate that manipulating light duration and intensity promotes faster germination and earlier flowering, potentially expediting hybridization processes within breeding programs. By reducing generation time, these findings suggest that targeted light treatments can significantly accelerate cultivar development, facilitating more efficient breeding strategies for Capsicum improvement.
Speakers
UM

Uriel Martinez

New Mexico State University
Co-authors
AV

Amanda Velazco

New Mexico State University
NA
DN

Dennis Nicuh Lozada

New Mexico State University
SN

Shahab Nourbakhsh

New Mexico State University
Wednesday July 30, 2025 10:30am - 11:40am CDT
Empire AB

10:30am CDT

UG 2 - Comparative Observation of Trichome Type and Density in Solanum spp. Using Scanning Electron Microscopy
Wednesday July 30, 2025 10:30am - 11:40am CDT
Trichomes play vital roles in plant defense and environmental regulation, including protection from UV rays and herbivores, as well as helping to manage surface temperature and reduce water loss. There are two main types of trichomes, glandular, which produce secondary metabolites such as alkaloids, flavonoids, and terpenes, and non-glandular, which are primarily involved in physical protection and regulation. This study aims to document and compare trichome type, density, and morphology in both wild and cultivated Solanum (tomato) species. Two wild species and two cultivated varieties were grown in a greenhouse, and leaf samples are collected during the vegetative growth stage. Small circular cuttings from mature leaves are air dried and examined under a Tescan Vega3 scanning electron microscope (SEM). Data was collected on trichome type, ratio, density, and morphology for each variety. This comparative analysis provides foundational information about trichome structure across tomato species, which may relate to differences in environmental adaptability or natural pest resistance.
Speakers
DP

Dalton Palmer

Utah Valley University
Co-authors
JR

Jeremy Redd

Utah Valley University
NA
YL

Yu-YA Liang

Utah Valley
NA
Wednesday July 30, 2025 10:30am - 11:40am CDT
Empire AB

10:30am CDT

UG 2 - Evaluating the Effect of Selenium Biofortification on Beta-Carotene Accumulation in Upland Cress Grown in a Greenhouse
Wednesday July 30, 2025 10:30am - 11:40am CDT
Nutrient biofortification through micronutrient supplementation offers a practical approach to enhancing the nutritional profile of leafy vegetables while promoting sustainable food production. Selenium (Se), a vital trace element for human health, plays a significant role in plant metabolism and the synthesis of antioxidant compounds such as beta-carotene. However, just a few research has explored selenium's effect on beta-carotene accumulation in upland cress (Barbarea verna) under controlled greenhouse conditions. This ongoing study evaluates the effect of selenium biofortification on beta-carotene accumulation in upland cress using a deep-water hydroponic system. The experiment is laid out in a randomized complete design with a control and three selenium treatment levels (0, 1.0, 2.0, and 4.0 mg Se·L⁻¹), corresponding to control, low, medium, and high concentrations. Sodium selenate serves as the selenium source. Key growth parameters and environmental conditions such as pH and electrical conductivity (EC) of the nutrient solution are monitored throughout the cultivation period. Half Strength Hoagland solution is being used as a nutrient solution for this research. Plant samples will be analyzed to determine the relationship between selenium uptake and beta-carotene content using spectrophotometric analysis. This research aims to identify the optimal selenium concentration that enhances beta-carotene synthesis without compromising plant growth or yield. Preliminary observations suggest a dose-dependent physiological response to selenium supplementation, which may contribute to biofortification strategies for functional leafy greens. Findings from this study will inform controlled environment agriculture practices and support the development of nutrient-enriched crops for improved human health. Keywords: Selenium biofortification, Beta-carotene, Upland cress, Hydroponics, Controlled environment, Greenhouse production, Functional foods, Nutritional enhancement.
Speakers
AA

Adekunle Adeyeye

Kentucky State University, Frankfort, KY
Co-authors
TN

THEONESTE NZARAMYIMANA

Kentucky State University
Wednesday July 30, 2025 10:30am - 11:40am CDT
Empire AB

10:30am CDT

UG 2 - Identifying Heat Tolerant Root Stocks Out of Eight Different Tomato Cultivars Grown at Elevated Temperatures
Wednesday July 30, 2025 10:30am - 11:40am CDT
Identifying Heat Tolerant Root Stocks Out of Eight Different Tomato Cultivars Grown at Elevated Temperatures Samantha Buie, Courtney Dekalb-Myers, Shivani Kathi, Justin Moss Department of Horticulture and Landscape Architecture, Stillwater, Oklahoma, 74078 *Presenting author- Samantha.buie10@okstate.edu Heat stress is a common challenge when it comes to tomato production in Oklahoma. High temperatures affect different physiological and biochemical functions in tomato plants, thereby affecting plant growth, yield, and fruit development. The current study aims to identify the heat tolerant tomatoes and their potential for root stocks out of eight tomato varieties. Different varieties of tomatoes include ‘Celebrity’, ‘Florida 91’, and trial varieties ‘NC 2/270’, ‘NC 2/271’, and ‘NC 2/272’ which are considered heat tolerant, while ‘Homestead’ and ‘Rutgers’ are considered heat sensitive. These varieties were replicated four times in completely randomized design in two different growth chambers. One growth chamber was maintained at an optimum temperature (26 °C/ 19 °C Day/night) and the other growth chamber was maintained at elevated temperature conditions (36 °C/ 26 °C). Data was collected on plant height, number of leaves, side shoots, flowers, and fruits, and plant and root biomass at harvest. The heat tolerant tomato cultivars had better plant and root characteristics than that of heat sensitive tomatoes. Identification of superior root stocks will help researchers use them in combination with better performing scions in future studies to develop heat-tolerant grafted tomato plants with improved growth and yield.
Speakers
SB

Samantha Buie

Oklahoma State University
Co-authors
CD

Courtney DeKalb Myers

Oklahoma State University
JM

Justin Moss

Horticulture and Landscape Architecture
NA
SK

Shivani Kathi

Oklahoma State University
Wednesday July 30, 2025 10:30am - 11:40am CDT
Empire AB

10:30am CDT

UG 2 - Reducing leaching during short-cycle, plant production reduces phosphorus losses
Wednesday July 30, 2025 10:30am - 11:40am CDT
Short-cycle, plant production requires frequent irrigation and readily available nutrients to support plant growth. However, excess irrigation can lead to higher leach volumes and nutrient losses that can slow plant growth while increasing offsite nutrient movement into sensitive areas. The objective of this study was to evaluate the effect reducing leaching has on P losses during coleus (Plectranthus scutellarioides) production over a four-week production cycle. Coleus plugs were grown in 3-quart containers filled with a 3 pinebark:1 peat:1 vermiculite substrate amended with 0.3 kg m–3 N and P2O5 kg m-3. Irrigation was applied at 298 mL (1.05 cm) during a single two-minute cycle per day as a standard treatment versus coleus grown under a sensor-controlled irrigation system that ceased application once leaching occurred. Leachate was captured in one plant per replication for weekly measurement of pH, EC, and DRP. No differences in coleus growth index or shoot and root biomasses at 4 weeks after planting (WAP) occurred between coleus following either irrigation regimen. However, coleus subject to the sensor-controlled irrigation resulted in reductions in cumulative irrigation and leachate volumes of 40% and 69%, respectively, that led to a 45% reduction in cumulative DRP leached compared to coleus following the standard timed irrigation regimen. Limiting irrigation to reduce the incidence and volume of leaching can significantly decrease DRP losses without sacrificing coleus growth.
Speakers
EB

Evelyn Boakye

UNCP
I am an undergraduate student
Co-authors
BR

Braydann Revels

UNCP
I’m an undergraduate student majoring in biology with a biomedical emphasis.
Wednesday July 30, 2025 10:30am - 11:40am CDT
Empire AB

10:30am CDT

UG 2 - Solarization of substrate using a solar oven to reduce weed seed competition
Wednesday July 30, 2025 10:30am - 11:40am CDT
Weed seed contamination of substrates often leads to weeds competing with the desired plant species for essential resources. The objective of this research was to evaluate if a solar oven provides a simple sustainable, solarization method for reducing weed competition in small batches of contaminated pine-bark based substrate. In the laboratory, petri dishes containing 100 weed seeds per plate that were subjected to 15 or 30-min heat treatments at 45, 60, and 75°C using a electric oven. Non-heat-treated seeds served as controls. Heat treated seeds and controls were then germinated in a growth chamber over twenty-one days. Weed seeds that were heat treated at higher temperatures for 30-min resulted in declining germination rates, while weed seeds exposed to corresponding temperatures for 15-min exhibited less efficacy in reducing germination. Based on the laboratory results, a field experiment was setup to evaluate solarization of a weed seed contaminated substrate using a solar oven. Substrates were mixed with 100 weed seeds per replication and subjected to >65°C for 30-min. Substrates were placed under greenhouse conditions to measure seed emergence. Weed seed emergence declined after solarization, however, performance of the solar oven was dependent on environmental fluctuations.
Speakers
BR

Braydann Revels

UNC-Pembroke
I’m an undergraduate student majoring in biology with a biomedical emphasis.
Co-authors
EB

Evelyn Boakye

UNCP
I am an undergraduate student
Wednesday July 30, 2025 10:30am - 11:40am CDT
Empire AB

10:30am CDT

UG 2 - Variety Trial of Hydroponic Brassica oleracea (kale) Across Different Systems and Natural Light Exposure
Wednesday July 30, 2025 10:30am - 11:40am CDT
The aim of this project is to take seven different cultivars of Brassica oleracea (kale) and quantify their performance based on morphological and yield data and compare the results when planted in either west or east facing greenhouses and either Deep Water Culture (DWC) or Nutrient Film Technique (NFT) hydroponic systems. Two identical greenhouses were set up with both a DWC and NFT inside, one facing east and one west. Seedlings were started in rockwool under the same conditions for 21 days in both greenhouses, then moved to either the DWC or NFFT system and left to grow for 25 days in similar fertilizer and pH levels. When comparing consumable plant mass (leaves) across these variables, the plants in the east facing bay had a 38% increased size compared to the plants in the west facing, the plants in the DWC had a 29% increase compared to the NFT. The varieties KX-1 and Oldenbor were the top performers across several categories including low size, high weight, and uniformity.
Speakers
DV

Devin Vitello

University of Tennessee Knoxville
I am an undergraduate researcher under Dr. Carl Sams here at The University of Tennessee Knoxville. I am majoring in Plant Sciences with a concentration in Horticulture and Production, and I have a minor in Food and Agriculture Business.
Wednesday July 30, 2025 10:30am - 11:40am CDT
Empire AB
  Poster, Undergraduate Student 2
  • Poster # csv
  • Funding Source AURA

12:14pm CDT

Wednesday Poster Session - 3
Wednesday July 30, 2025 12:14pm - 1:00pm CDT
Wednesday July 30, 2025 12:14pm - 1:00pm CDT
Empire AB

12:15pm CDT

CE 2 - Active Aeration Increases Biomass by Enhancing Water Uptake in Greenhouse Hydroponic Lettuce and Influences Efficacy of a Calcium-Mobilizing Biostimulant
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Tipburn is a physiological disorder that compromises the appearance and marketability of lettuce (Lactuca sativa) by causing necrosis and curling at leaf margins. It is problematic in controlled-environment hydroponic systems, where calcium demand outpaces calcium supply. Previous research demonstrated that nutrient solution application of a calcium-mobilizing biostimulant curbed lettuce tipburn. However, it remained unclear whether its efficacy depended on nutrient solution dissolved oxygen (DO), which is crucial for water and nutrient uptake. We evaluated effects of this calcium-mobilizing biostimulant and the DO level on growth and tipburn severity of hydroponic butterhead lettuce ‘Nancy’. Seeds were planted in a temperature-controlled greenhouse under a 24-hour photoperiod with supplemental white red light-emitting diodes providing a mean photosynthetic photon flux density of 300 μmol⋅m–2⋅s–1. After 11 days, seedlings were transplanted into deep-water-culture trays in the same greenhouse at 22.7 ± 4.1 °C air temperature and 23.6% ± 5.1% relative humidity, with the same continuous supplemental lighting. In a randomized complete block design with three blocks, plants were grown in nine nutrient solution treatments per block, which were combinations of three biostimulant concentrations (0, 0.25, and 0.5 mL⋅L–1) and three DO levels (2.9, 3.5, and 4.0 mg⋅L–1). The low DO level was achieved without active aeration, whereas the medium and high DO levels were achieved with active aeration by adjusting airflow rates. Plants were evaluated on 21 and 28 days after transplant (DAT). On 21 DAT, plant growth benefited from active aeration but was unaffected by the biostimulant. Compared with no active aeration, active aeration increased shoot fresh mass by 127% to 139% and moisture content by 5% to 7%, but did not affect shoot dry mass. This indicates that growth promotion was attributed to increases in both relative and absolute water uptake, but not whole-plant photosynthesis, despite increased canopy size. The biostimulant decreased the percent of tipburn-affected leaves from 33% to 12% under the medium DO level. On 28 DAT, shoot fresh mass, shoot dry mass, moisture content, and canopy size had similar trends to those on 21 DAT. The high biostimulant concentration decreased the tipburn rating by 36% and the number of tipburn-affected leaves by 50% without active aeration, but not with it, indicating that the biostimulant was more efficacious under root hypoxia than under sufficient DO levels. We conclude that active aeration enhances lettuce water uptake and shoot fresh mass, whereas the biostimulant moderately controls tipburn at lower DO levels.
Speakers
JR

Jonathan Ries

University of Delaware
Co-authors
QM

Qingwu Meng

University of Delaware
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Growth Chambers and Controlled Environments 2
  • Poster # csv
  • Funding Source This work is supported by the Urban, Indoor, and Emerging Agriculture Program (project award no. 2023-70019-39371) from the U.S. Department of Agriculture’s National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and should not be construed to represent any official USDA or U.S. Government determination or policy.

12:15pm CDT

CE 2 - Effect of Constant Air Flow on Lettuce Morphology and Yield in Vertical Farming Systems
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Lettuce is the most cultivated leafy vegetable under vertical farming due to its short growth period and stable market demand. However, lettuce production in those systems often faces challenges such as unequal temperature inside cultivation room and benches, which causes uneven growth, leading to cultivation delays and yield loss. In this study, we investigated the effect of constant air flow on lettuce production in vertical farming to observe changes in morphology and yield. The aim of this study was to improve leaf lettuce production in vertical farms. Leaf lettuces were grown at Advanced Plant Factory Research Center, Meiji university under temperature of 22°C, relative humidity of 60%, under white LED light at a PPFD of 140–200 µmol·m⁻²·s⁻¹ for 16 hours. The hydroponic solution was supplied to the seedlings by the deep flow technique at an EC of 1.6 dS·cm⁻¹, pH of 6.0±0.5. For the air flow treatment, air tubes were placed above the seedlings, a constant wind speed of 0.1-0.2 m/s for 24 hours was supplied to seedlings. At 10, 20, and 30 days after transplanting (DAT), lettuces from both the control and air flow treatment groups were selected for stomata evaluation using a non-destructive equipment. At 30 DAT, yield evaluation, including fresh weight, leaf count, and morphology change such as leaf thickness, was also conducted. We found that the constant air flow treatment increased the fresh weight and leaf count of the lettuces. Furthermore, an increase in leaf hardness was observed. Moreover, we found that the number of stomata tended to be higher when the fresh weight was greater. This tendency was particularly strong in the air flow group which proved that it improved the growth and morphological characteristics of lettuce, suggesting its potential for enhancing vertical farming productivity.
Speakers
JS

Junjira Satitmunnaithum

Specially-appointed lecturer, Organization for the Strategic Coordination of Research and Intellectual Properties, Meiji University , Japan
Co-authors
CI

Chiharu Inoue

Daiwa house industry
NA
SO

Sakurako Otani

Meiji university
TO

Takao Otsuka

Daiwa house industry
NA
TI

Takashi Ikeda

Meiji university
NA
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB

12:15pm CDT

CE 2 - Exploring Hydroponic Head Lettuce Performance: Deep Water Culture vs. Vertical Production Systems
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Hydroponic farming has emerged as a promising solution to global food security challenges, with the market projected to reach $12 billion by 2025. Two commonly used systems are floating raft deep water culture (DWC) and vertical nutrient film technique (NFT) production systems. Despite their popularity, limited research exists comparing water use efficiency and Photosystem II (PSII) performance between these systems. This study begins to address this gap by evaluating the growth of Butterhead lettuce in both DWC and vertical NFT systems within a controlled greenhouse environment. PSII physiological parameters were assessed using a handheld fluorometer (MultispeQ Version 2 – PhotosynQ). Crop-level water use efficiency was also compared between systems. As expected, preliminary results indicated that the DWC system was more efficient in its water use than the vertical NFT system (p < 0.05), after adjusting for baseline water loss prior to plant introduction. More importantly, lettuce grown in the DWC system exhibited a higher mean PSII efficiency (Fv’/Fm’) and greater wet biomass compared to those grown in a vertical system. This study is among the first to directly compare PSII-related traits across hydroponic system designs, providing novel insights into how production method influences plant physiological performance. These findings suggest that DWC systems may offer superior performance, improved water use efficiency, and higher yields, making them a more sustainable and effective alternative for hydroponic lettuce production compared to vertical NFT systems.
Speakers
IS

Isaiah Spiegelberg

University of Wyoming
Co-authors
CG

Carmela Guadagno

University of Wyoming
NA
SD

Sarah Doyle

University of Wyoming
NA
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Growth Chambers and Controlled Environments 2
  • Poster # csv
  • Funding Source NSF

12:15pm CDT

CE 2 - Growth and Nutrient Dynamics in Salanova Lettuce: Evaluating Biofortification Potential in Field and Deep-Water Systems
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Enhancing the nutritional quality of leafy greens is a key goal in horticultural research, with biofortification strategies offering potential benefits for human health. This study examines the effects of foliar ascorbic acid (vitamin C) applications on the growth and nutrient composition of Salanova lettuce (Lactuca sativa) in both deep-water hydroponic and field production systems. Lettuce plants were subjected to four treatment concentrations (0, 500, 750, and 1000 ppm ascorbic acid), applied as foliar sprays at two and four days before harvest. Growth parameters, including biomass accumulation over time and final fresh weight, were recorded for both systems. Chlorophyll content before and after treatment applications were compared to assess potential physiological responses. Vitamin C content analysis is ongoing to determine potential biofortification effects. Results indicated no significant negative impacts on plant width among treatments in both field and deep-water systems, or on final biomass among treatments in the field. A block effect was observed in the final weight for the deep-water system, suggesting environmental or positional influences within the setup. Chlorophyll content in the deep-water system was higher in the 0 and1000 ppm treatments and lowest in the 750ppm treatment, showing that there may be slight impacts on lettuce quality. However, no impacts of treatment on chlorophylls were seen in field trials. These results show that ascorbic acid sprays up to 1000 ppm do not negatively impact lettuce quality. Further analysis will determine whether short-term nutrient enhancement through biofortification is viable. These findings contribute to understanding nutrient management strategies for hydroponic and field-grown lettuce and their potential role in sustainable production systems.
Speakers
KS

Kaitlyn Stubbs

Texas Tech University
Co-authors
AR

Abishkar Regmi

Texas Tech University
CC

Carlos Carpio

New Mexico State University
NA
CS

Catherine Simpson

Texas Tech University
CW

Chenggang Wang

Texas Tech University
NA
KV

Katerina Vargas

Texas Tech University
LT

Leslie Thompson

Texas Tech University
NA
NM

Naima Moustaid-Moussa

Texas Tech University
NA
SS

Sukhbir Singh

Texas Tech University
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Growth Chambers and Controlled Environments 2
  • Poster # csv
  • Funding Source Texas Tech University Pursuit of Prime

12:15pm CDT

CE 2 - The Water Vapor-pressure Deficit Regulates Growth of Culinary Herbs and Lettuce in Controlled Environments
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
This experiment aims to quantify the effects of the water vapor-pressure deficit (VPD) on growth and quality of culinary herbs and lettuce grown inside controlled environments. We postulated that growth will be inhibited at very low and very high VPDs when all other environmental factors are kept constant. We sowed seeds of holy basil (Ocimum tenuiflorum), chamomile (Matricaria chamomilla), lettuce (Lactuca sativa ‘Rex’), mint (Mentha spicata), and lemon balm (Melissa officinalis) in plug trays containing a peat-based soilless substrate. Seedlings grew inside refrigerated chambers at 23°C, with 24-h photoperiod at a photosynthetic photon flux density of 160 µmol∙m–2∙s–1, at five VPD setpoints (kPa): 0.3, 0.7, 1.1, 1.5, and 1.9. We fertigated plants with reverse-osmosis water at a constant fertility of 60 mg N∙L–1. We measured the total leaf area, leaf number, stem length, fresh shoot biomass, and dry shoot biomass, and monitored leaves for tip-burn symptoms. Preliminary results indicate that leaf area and fresh mass of most species were lower at a VPD of 0.3 kPa than at ≥0.7 kPa. In some species (e.g., mint), plants were shortest at the lowest VPD tested, whereas in others (e.g., chamomile), stem length decreased as the VPD increased. These results indicate the importance of managing VPD in controlled environments and especially the potential decreases in growth under low a VPD (i.e., high relative humidity).
Speakers
AT

Avery Tucker

Michigan State University
Co-authors
ER

Erik Runkle

Michigan State University
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB

12:15pm CDT

MKEC - Beyond Plastic: Consumer Awareness as a Catalyst for Biodegradable Plastic Acceptance in Agriculture
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Soil-biodegradable plastic mulches (BDMs) are an alternative to non-biodegradable plastic mulch films. BDMs reduce agricultural plastic waste generation while maintaining many of the horticultural benefits of traditional mulch film. Yet, many farmers are reluctant to adopt BDMs. Previous research suggests that this hesitancy stems, in part, from farmers’ belief that consumers may be concerned about the unsightly plastic fragments left behind as BDMs biodegrade. Some farmers fear these remnants could be viewed by consumers as indicative of “bad farming” practices. However, consumers’ actual perceptions have not been evaluated. The objective of this research was to explore consumers’ perceptions of BDM fragments in farm fields. A rapid market assessment (RMA) paired with exploratory interviews were conducted with consumers at a farmer’s market in Northwest Washington State in Winter 2024. Of the 50 people who completed the farmers’ market RMA, 51% and 14% disagreed or strongly disagreed, respectively, that growing produce is associated with plastic use. Moreover, approximately 80% of the respondents indicated they did not think plastic use was essential to modern agriculture. Most respondents agreed (51%) or strongly agreed (12%) that farm visual cleanliness is important and influences their willingness to support a farm with their business. All respondents (100%) did not like seeing plastic waste on farms. Nearly all (96%) expressed a preference for biodegradable alternatives to non-biodegradable agricultural plastics, which is noteworthy given that 66% of consumers had prior experience or knowledge of biodegradable plastics. These findings, along with the exploratory interview results, suggest that consumers are more accepting of soil-biodegradable plastic scraps in farm fields, especially when they are aware the material is biodegradable and used as an eco-friendly alternative to non-biodegradable plastics.
Speakers
AW

Aidan Williams

Washington State University
Co-authors
JG

Jessica Goldberger

Washington State University
NA
LW

Lisa Wasko DeVetter

Washington State University
Lisa Wasko DeVetter joined Washington State University in 2014 and leads the small fruit horticulture program at the Northwestern Washington Research and Extension Center in Mount Vernon, Washington. She has developed a diverse research and extension program with an emphasis on maximizing... Read More →
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Marketing and Economics
  • Subject Marketing and Economics
  • Poster # csv
  • Funding Source USDA Agriculture and Food Research Initiative Competitive Grants Program Foundational and Applied Science Program

12:15pm CDT

MKEC - Comparing Conventional In-ground Tomato Production to Hydroponic Tomato Systems.
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
The rapid increase in the global population has led to a decline in land availability for agricultural production, resulting in food insecurity and exacerbating environmental challenges such as soil degradation, deforestation, and biodiversity loss. In-ground farming faces growing challenges, including declining soil fertility, water scarcity, and vulnerability to climate change, along with issues like soil erosion, nutrient depletion, and heavy reliance on chemical inputs. In response, hydroponics has emerged as a sustainable alternative, enabling year-round production, efficient resource utilization, and cultivation in non-arable areas. This study compares the growth performance, fruit quality and production costs of tomato grown hydroponically and in a in-ground system. For the inground system, there is a total of 20 tomato plants per plot, each of size 10 × 10ft, with three replications arranged in a completely randomized design. For hydroponic system, 30 tomato plants will be grown on bags filled with three different substrates (coconut coir, perlite, and pro mix), and bags were randomly placed inside one tunnel of size 32ft × 8ft, with three replications. Two indeterminate tomato varieties Early Girl Hybrid and Fourth of July Hybrid will be grown one after another using open drip hydroponic system and in in-ground system. Throughout the experiment, morphological traits such as plant height, leaf number, leaf area, relative chlorophyll content, fresh and dry biomass, stem diameter, and overall plant yield will be evaluated. Phytochemical parameters including total soluble solids, titratable acidity, lycopene content, phenolic compounds, and vitamin C levels will be assessed, economic parameters such as cost of labor, input supplies and net profit will be analyzed, and consumers acceptance testing by sensory analysis will be performed. This research aims to provide insights into the economic and agronomic viability of hydroponics compared to in-ground production. It is hypothesized that hydroponically grown tomatoes will exhibit comparable or superior nutritional quality while offering advantages such as higher yields, uniform fruit size, economically and sustainable sound production. The findings will support stakeholders in selecting optimal cultivation systems to enhance food production efficiency in response to global agricultural challenges.
Speakers
MJ

Mona Joshi

Kentucky State University
Co-authors
JH

James Howard

Kentucky State University
NA
MC

Milon chowdhury

Kentucky State University
SD

Siddhartha Dasgupta

Kentucky State University
NA
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Marketing and Economics

12:15pm CDT

MKEC - Comparing Production And Market Acceptance Of Salad Greens And Cruciferous Vegetables Grown In Hydroponics Versus Tradit
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Hydroponic farming has gained increasing attention as a sustainable alternative to conventional soil-based agriculture, offering efficient resource utilization and enhanced crop production. This study evaluates the agronomic performance, economic viability, and market acceptance of hydroponic versus traditional in-ground cultivation for salad greens and cruciferous vegetables. The research examines key factors including crop yield, nutrient uptake efficiency, water consumption, production costs, and consumer preferences. Growth parameters such as biomass accumulation, nutrient absorption rates, and plant health indicators were assessed to compare the effectiveness of each system. Economic analysis includes production expenditures, labor requirements, and potential profitability, while market acceptance is evaluated through consumer surveys and purchasing trends. Results indicate that hydroponic systems demonstrate advantages in resource efficiency, faster growth rates, and potential for year-round production, making them a viable option for beginning and limited-resource farmers. However, challenges such as initial investment costs and market adaptation remain significant barriers to widespread adoption. Consumer perception studies reveal varying levels of acceptance based on factors such as taste, texture, and sustainability awareness. This research provides crucial insights into optimizing hydroponic farming strategies to enhance productivity, economic sustainability, and consumer engagement. Findings contribute to the broader discourse on sustainable agriculture, addressing the challenges faced by emerging farmers and exploring innovative solutions for improving food security and environmental stewardship. The study underscores the importance of integrating market-driven approaches with technological advancements to support the transition towards efficient and economically viable hydroponic production systems.
Speakers
AA

Amer Adawi

Kentucky State University
Co-authors
SD

Siddhartha Dasgupta

Kentucky State University
NA
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Marketing and Economics

12:15pm CDT

MKEC - Consumer Willingness to Pay and Sensory Evaluation of Organic and Conventional Strawberries Grown in a Substrate-Based Tabletop Hydroponic System
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
The consumer demand has largely promoted organic strawberry production in the U.S. over the past two decades. The farm gate value of organic strawberries increased from $80 million in 2008 to $300 million in 2019, and organic strawberries accounted for about 25% of the 2022 U.S. strawberry sales. While Florida represents a smaller share than California, its organic acreage grew from less than 20 acres in 2008 to over 600 acres in 2019. Recent advances in agricultural technology have played an important role in improving strawberry yields and quality. The tabletop hydroponic system is among the new systems introduced to strawberry production with the aim of reducing labor requirements, enhancing input efficiency, and improving disease, pest, and weed management. However, no study has examined its impact on strawberry fruit regarding sensory attributes and consumer attitudes toward such a system for organic and conventional strawberry production. This study was conducted to assess consumers’ willingness to pay (WTP) for conventional and organic strawberries harvested from the tabletop hydroponic system under two scenarios, i.e., based on the blind sensory evaluation vs. after revealing the production method information (organic or conventional and tabletop hydroponic system). The consumer sensory evaluation was conducted at the University of Florida campus, with 61 participants. Participants first blind tasted four strawberry samples, including two organically grown and the other two conventionally produced, all from a tabletop growing system established for an on-farm trial. They evaluated sensory attributes using a just-about-right (JAR) scale and a hedonic scale, and reported their WTP before and after tasting the strawberry samples. Subsequently, participants were informed about organic and tabletop production methods used to produce the strawberries and asked to re-evaluate their WTP. Results indicate that consumers had a higher WTP for organic strawberries than their conventional counterparts, both before and after tasting. After being informed about which samples were organic, 28% of participants reported no additional WTP, 47% were willing to pay up to $1 more, and 22% were willing to pay $1 to $2 more, with an average premium of $0.79. These findings remained consistent after controlling for sensory attributes and demographics. When knowing the berries were produced in a tabletop system, the average WTP for organic strawberries increased by $0.73, while it increased by $0.56 for conventional strawberries. In addition, participants tended to associate organic strawberry samples with higher sensory evaluation scores and link lower sensory scores to conventional strawberry samples.
Speakers
XZ

Xin Zhao

University of Florida
Co-authors
CS

Charles Sims

University of Florida
NA
CH

Chenxi Hu

University of Florida
NA
WE

Wael Elwakil

Extension Agent II, University of Florida
YJ

Yifan Jing

University of Florida
NA
ZG

Zhifeng Gao

University of Florida
NA
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Marketing and Economics

12:15pm CDT

MKEC - Decoding Consumer Preferences: The Impact of Wine Label Design and Packaging
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
This research investigates consumer perceptions and attitudes towards disease-resistant wine varieties, focusing on labeling, communication strategies, and barriers to adoption. Utilizing qualitative data from 500 participants, the study identifies key motivations for wine purchasing using the combination of latent Dirichlet allocation and thematic analysis. The findings reveal that consumers generally welcome the concept of disease-resistant wines, yet express concerns about terminology and the potential impact on wine quality. Effective communication strategies, emphasizing positive attributes and transparent information on labels, are crucial for fostering consumer trust. Additionally, barriers such as choice overload and fear of unfamiliar products highlight the need for targeted marketing initiatives. This study provides valuable insights for marketers in the wine industry, facilitating the introduction of sustainable wine varieties in a competitive marketplace.
Speakers
CY

Chengyan Yue

University of Minnesota-Twin Cities (Minneapolis, MN)
Co-authors
GS

Garrett Steede

University of Minnesota
NA
KG

Karina Gallardo

Washington State University
NA
MC

Matthew Clark

University of Minnesota
NA
UP

Uma Parasuram

University of Minnesota
NA
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Marketing and Economics
  • Subject Marketing and Economics
  • Poster # csv
  • Funding Option SCRI funded all or part of the research associated with this abstract

12:15pm CDT

O/LT - Characterizing Phenotypic Variation in Ratibida columnifera Through Field and Greenhouse Studies
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Characterizing phenotypic variation in Ratibida columnifera (Nutt.) Woot.
Speakers Co-authors
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Ornamentals/Landscape and Turf

12:15pm CDT

O/LT - Evaluating Drought Responses in Four Native Ornamental Species from High-Elevation Desert Regions
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Due to low annual precipitation and high elevation, many residential areas in the Intermountain West region are classified as high-elevation deserts, necessitating the incorporation of drought-tolerant plants in residential landscapes. However, due to the short growing season and low winter temperatures, many commercial water-wise plants often fail to thrive in this region. Native plants from the Intermountain West could serve as low-water-use landscaping alternatives, but their drought tolerance remains unclear. The objectives of this study were to determine the effects of decreased medium volumetric water contents on the plant growth and physiology of four native ornamental plant species, including Asclepias speciosa (showy milkweed), Hedysarum boreale (Utah sweetvetch), Penstemon eriantherus (fuzzytongue penstemon), and Penstemon grandiflorus (shell-leaf beardtongue), in a greenhouse. Twenty-four plants of each species were randomly assigned to an automated irrigation system, and the substrate volumetric water content was maintained at 0.40 (control) or 0.20 m3⋅m−3 (drought) for 50 days. The decrease in substrate volumetric water content resulted in increased proportion of leaves visibly wilted across the four plant species and also impaired their visual quality. However, H. boreale, P. eriantherus, and P. grandiflorus receiving drought treatment where the substrate volumetric water content was 0.20 m³·m⁻³ still showed acceptable visual quality, while A. speciosa exhibited an unacceptable visual quality. However, the reduction in substrate volumetric water content from 0.40 to 0.20 m³·m⁻³ decreased relative plant growth index of A. speciosa and H. boreale by 19% and 17%, respectively, at the termination of the experiment. In addition, the total leaf area of H. boreale, P. eriantherus, and P. grandiflorus decreased from the control to the drought treatment, while the drought treatments reduced the dry weight of leaves of A. speciosa, H. boreale, and P. grandiflorus. To acclimate to the drought stress, A. speciosa and H. boreale modified their specific leaf area. In addition, H. boreale also increased its root to shoot ratio to adapt to water stress. Drought stress impaired the visual quality and growth of all four high-elevation desert ornamental species in this research. Penstemon eriantherus and P. grandiflorus maintained better visual quality and growth, making them more suitable for low water-use landscaping. Asclepias speciosa showed greater sensitivity to reduced water content despite its morphological adaptations to drought.
Speakers
DC

David Claypool

University of Wyoming
Co-authors
JC

Ji-Jhong Chen

University of Wyoming
RG

Robert Greenwald

Eastern Wyoming College
NA
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Ornamentals/Landscape and Turf
  • Subject Ornamentals Landscape and Turf
  • Poster # csv
  • Funding Source University of Wyoming University of Wyoming College of Agriculture, Life Sciences, & Natural Resources, Office of Research and Economic Development Designated, Department of Plant Sciences. United States Department of Agriculture National Institute of Food and Agriculture (NIFA) Plant Sciences Hatch Funds (WYO-631-22)

12:15pm CDT

O/LT - Evaluating the Suitability of Bermudagrass and Zoysiagrass for Golf Tee Use in the Chicago Area
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Warm-season (C₄) turfgrass species such as bermudagrass (Cynodon spp.) and zoysiagrass (Zoysia spp.) exhibit superior recuperative potential compared to cool-season species. Excessive divot injury on cool-season turfgrass tees during peak golf play in summer can be problematic in Chicago, IL. Newer bermudagrasses and zoysiagrass are adaptable to northern climates, given improved cold tolerance. Improved cold tolerance and recuperative potential of newer bermudagrass and zoysiagrass suggest their possible use as a golf tee surface in temperate regions. This study evaluated newer cold-tolerant warm-season cultivars for use on golf course tees and was conducted in Lemont, IL. The RCBD study utilized eight treatments with five replications. Treatments included four bermudagrass cultivars (Tahoma 31, OKC3920, OSU15x9, OSU1629) and four zoysiagrass cultivars (Meyer, Innovation, DALZ1701, DALZ1808). Area Under the Progress Curve (AUPC) was used to integrate seasonal performance across timepoints. Bermudagrass entries Tahoma 31, OKC3920, and OSU1629 demonstrated significantly superior establishment rates, lateral spread, and turfgrass cover. In 2024, average turfgrass cover for the four bermudagrasses was 60% versus 21.1% for the four zoysiagrasses. All bermudagrasses retained acceptable green color ratings (≥6) by mid-October, with OSU15x9 showing extended fall green color retention. Meyer and DALZ1808 zoysiagrass were the earliest to break dormancy on Apr 29, 2025. Continued evaluation of cold-tolerant warm-season turfgrasses for winter survival is necessary prior to their use in northern climates.
Speakers
SS

Shehbaz Singh

Manager of Turfgrass research, Chicago District Golf Association
Co-authors
DS

Derek Settle

Chicago District Golf Association
NA
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB

12:15pm CDT

O/LT - Influence of mulch application and planting depth on growth of Magnolia grandiflora 'Kay Parris'.
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
The effects of planting trees at improper depths have been clearly identified for many species. Improper planting often leads to reduced growth, reduced aesthetic value and increased mortality. Magnolia grandiflora is an evergreen species native to coastal states from North Carolina, south to Florida and west to Texas. The cultivar 'Kay Parris' is gaining popularity and is widely cultivated in the southeastern U.S. for its compact form and beauty in the landscape. On 18 December, 2023, asexually propagated 'Kay Parris' magnolia in 8.7L containers were transplanted to a field in Nacogdoches, TX. Plants were randomly assigned one of four planting depths (crown 5 cm above grade, crown planted at grade, crown 5 cm below grade and crown planted 10 cm below grade) and one of two mulching treatments (7.6cm of mulch applied or no mulch). Plants were randomly arranged in a modified complete block design comprised of 3 blocks with 2 plants of each treatment combination in a block. Dimensions of each plant (including height and width in two directions) were recorded at planting and ornamental ratings were assigned. After one year of establishment, the only statistically significant difference among the treatments was that those plants that received a mulch application grew taller than those with no mulch by over 7cm. No other statistical differences appeared in year one of the study. Year two of the study is ongoing.
Speakers
AK

Andrew King

Texas A&M AgriLife
Co-authors
DC

David Creech

SFA Gardens
NA
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB

12:15pm CDT

O/LT - Public Perception of Diverse Seed Mixes for Urban Landscape Use
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
High diversity seed mixes have potential for providing ecological benefits including improvement of soil health, support of pollinator populations, and providing low maintenance landscaping. The focus of this research is to evaluate perception of the general public on the aesthetic value and desirability of diverse seed mixes in various settings. An online survey was deployed which included imagery of diverse seed mixes and conventional landscapes. Respondents were asked to rate desirability of the use of diverse seed mixes in various potential areas including home gardens, low traffic public spaces, and vacant lots. Respondents were also asked to evaluate the perceived ecological services associated with diverse seed mixes. Of respondents, 42 percent found diverse seed mix plantings appealing, compared to 52 percent who expressed that a conventional landscape was appealing. Greatest support for application of diverse seed mixes was for use in private gardens, vacant lots, and community garden spaces. Among respondents, enhancing appearance and support for pollinator populations were rates of highest importance in terms of landscaping benefits.
Speakers
MB

Molly Boyd

University of Nebraska-Lincoln
NA
Co-authors
CE

Christian Elowsky

University of Nebraska-Lincoln
NA
LL

Louise Lynch-O'Brien

University of Nebraska-Lincoln
NA
RS

Ronald Stephenson

Plant Sciences Hall
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB

12:15pm CDT

O/LT - Responses of Ornamental Groundcovers and Turfgrass Species to Drought Stress
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Water use in the landscape has become a more prevalent issue as the demand increases for more residential and commercial areas to be irrigated. This increase in water use indicates a need for drought tolerant plant species. Ornamental ground covers may provide an alternative to traditional turfgrass and provide water savings. Several studies have evaluated drought tolerance of turfgrass species, including Poa pratensis and Festuca arundinacea. Ground cover species, however, have less research available regarding drought tolerance. In this study, we analyzed six ground cover species (Dianthus caryophyllus, Lysimachia nummularia, Phlox subulata ‘Emerald Blue’, Sedum album, Stachys byzantina, and Vinca major) and three turfgrass species (Bouteloua dactyloides, Festuca arundinacea, and Poa pratensis) to evaluate their performance during drought and recovery. We conducted two studies to simulate drought-like conditions in a greenhouse at Kansas State University from April 2024 to November 2024 and May 2024 to January 2025. During the dry downs, plants were not watered until they reached a quality rating of one (1-9 scale, 1=dead/dormant and 9=best quality). Following the dry downs, normal watering resumed for 60 d to simulate a recovery period. Data collected three times per week during the drought period included quality rating (1-9), pot weight (g), and volumetric water content (θv); and one time per week we collected leaf water potential (ΨLeaf) and stomatal conductance (gs) readings. Results show S. album performed the best lasting an average of 157 d until reaching a quality rating of one. S. byzantina, B. dactyloides, V. major, D. Caryophyllus also performed well averaging 92, 51, 46, and 40 d, respectively, to a quality of one. P. subulate, P. pratensis, F. arundinacea, and L. nummularia performed the worst, averaging 35 d to decline to a quality rating of one. Following the dry down, the 60 d recovery period showed the following species recovered: B. dactyloides [58% Percent Green Cover (PGC)], F. arundinacea (45% PGC), L. nummularia (14% PGC), S. album (11% PGC), P. pratensis (10% PGC), and V. major (5% PGC). None of the other species recovered through the recovery period. Results indicate S. album, B. dactyloides, and V.major may perform the best in landscapes experiencing drought. F. arundinacea, L. nummularia, and P. pratensis may be good options as well if rain events or irrigation resumes following a dry or dormancy period.
Speakers
JC

Jacob Cody Domenghini

Assistant Professor, Kansas State University
Co-authors
LD

Levi Dreiling

Kansas State University
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB

12:15pm CDT

O/LT - The American Rose Trials for Sustainability® (A.R.T.S.®) Program Announces Fourteen Winning Roses for 2026
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
The American Rose Trials for Sustainability® (A.R.T.S.®) program trials roses throughout the US and is in its ninth year of announcing winning roses. Roses are evaluated monthly during the growing season for floral attributes (42.5% of score), foliar health and quality (45% of score), and growth habit (12.5% of score). Over the two-year trial, roses are grown using minimal inputs (i.e. no pesticides, no deadheading, moderate irrigation, etc.). Entries that score equal to or higher than the regional average of the control cultivars (Double Knock Out® [‘RADtko’] and Sunrise Sunset™ [‘BAIset’]) and have >50% survival by the end of the trial period, earn Local Artist awards based on Köppen climate region. Roses winning in four or more regions earn the added distinction of the Master Rose award. The 2026 award winning roses were trialed in 2023 and 2024. Six US Köppen climate regions were represented (Cfa, Cfb, Csa, Dfa, Dfb, and H) . Three roses won 2026 A.R.T.S.® Master Rose awards: Dessert First™ ('DD987-1'; Csa, Dfa, Dfb, and H), Ruby Red™ ('MEIzilena'; Csa, Dfa, Dfb, and H), and Blushing Drift® ('MEIfranjin'; Cfa, Cfb, Dfa, Dfb, and H). Eleven roses won 2026 A.R.T.S.® Local Artist awards: Celeste BlueSky™ ('P2046L'; Csa and Dfa), Easy Spirit™ ('WEKmereadoit'; Csa and H), Elizabeth® (AUSMajesty'; Cfa and Csa), Julie Andrews ('DELfluros'; Dfa), Maurice Utrillo™ ('DELstavo'; Csa), Patriot Dream™ ('BAIdre'; Dfa), Reminiscent® Coral ('BOZfra221'; Dfa), Ringo® Double Pink ('CHEWDelight', Csa abd Dfa), True Confidence™ ('FS118T'; Dfa), True Crush™ ('ESR015T'; Dfb), and White Lies™ ('POT3', H). Performance data will be provided by region for the two control and fourteen winning rose cultivars.
Speakers
avatar for Jeff Wilson

Jeff Wilson

Mississippi State University Extension
Co-authors
AB

Ashley Barkow

Green Bay Botanical Garden
NA
CS

Chris Schlenker

South Dakota State University
NA
CK

Crystal Kim

Red Butte Gardens-University of Utah
NA
DZ

David Zlesak

University of Wisconsin-River Falls
NA
GH

Gaye Hammond

Houston Rose Society
NA
GP

Gregory Pongetti

Arboretum and Botanical Garden at Cal State Fullerton
NA
JS

Jeff S. Kuehny

LSU AgCenter Botanic Gardens at Burden
NA
KM

Kristine M. Lang

South Dakota State University
MK

Mark Konlock

Green Bay Botanical Garden
NA
PD

Patrick Dahl

Chicago Botanic Garden
NA
RB

Rachel Burlington

Portland Parks
NA
RN

Randy Nelson

University of Minnesota-Crookston
NA
RH

Richard Hawke

Chicago Botanic Garden
NA
SG

Steve George

Texas A
NA
SW

Susan Worthey

Mississippi State University
NA
WE

Wanda Ellis

LSU AgCenter Botanic Gardens at Burden
NA
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB

12:15pm CDT

O/LT - Transitioning bentgrass to subsurface drip irrigation during establishment in sand-based systems
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Establishment of bentgrass (Agrostis stolonifera) from seed in sand-based systems using subsurface drip irrigation (SDI) presents a challenge due to limited capillary rise of water from the drip emitter. An experiment was designed to evaluate bentgrass seed irrigated overhead at establishment and then transitioned to SDI once roots reach specific depths. Treatments consisted of a control (overhead irrigation only) and SDI irrigated overhead till roots reached 0, 5, 10 and 15 cm depth. Nineteen-liter (5 gallon) buckets (lysimeters) were filled with 5 cm of pea-gravel and then 30 cm mix of sand 90% and peatmoss 10%. Each bucket had a single drip emitter (gallon/hour) in the center of the bucket at a 15 cm depth. Data consisted of days to reach transition depth, percent cover, soil moisture and nitrogen. The SDI at 0 cm rooting depth treatment never established any bentgrass as irrigation from the emitter never reached the surface. The 5, 10 and 15 cm SDI treatments transition from overhead to drip 18, 27 and 38 days after seeding, respectively. The percent cover was 100, 82, 85 and 95% for the control 5, 10 and 15 cm treatments, respectively at 90 days after seeding. Volumetric water content was highest in the control and lower in the SDI treatments regardless of treatment. The SDI irrigation treatments developed tissue desiccation on the perimeter of the bucket after transitioning as the lateral capillary movement of water failed to reach the width of the bucket. Further research is needed to evaluate SDI spacing during transitioning that produce a high quality turfgrass in sand-based systems.
Speakers
MM

Michael Maurer

Stephen F. Austin State University
Co-authors
AS

Aakriti Sharma

Stephen F. Austin State University
NA
LK

Luke Keene

Stephen F. Austin State University
NA
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB

12:15pm CDT

O/LT - Updating Fertilizer Best Management Practices for Sod Producers in Florida
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
This project is focused on improving nutrient management recommendations for sod producers as part of Florida’s best management practices (BMPs) program. The goal of this project is to evaluate nitrogen (N) fertilizer rate recommendations for Florida sod growers to achieve yield goals (shorten time to harvest) without negatively impacting water quality. The project was initiated in October 2023 and was conducted at four sod farms across the state and at the West Florida Research and Education Center (WFREC). At each farm, the project was conducted on two grass species. The N fertilizer (70% soluble plus 30% slow release) rates included 0, 120, 190, 260, and 330 lbs N/acre/year, which includes the range of current University of Florida, Institute of Food and Agricultural Sciences (UF/IFAS) recommendations. The annual N rate was split into monthly applications throughout the growing season. At the WFREC location, N applications were also being combined with phosphorus (P) fertilizer applications at 0 and 44 lbs P/acre/year to determine both N and P leaching. The treatments were arranged in a randomized complete block design with four replications. All other normal agronomic practices (irrigation, pesticides, etc.) were followed. Data collection included monthly visual turfgrass quality ratings, visual estimated percent cover, percent green cover via digital image analysis, and normalized difference vegetation index (NDVI). Soil cores and tissue samples were collected at the beginning and end of each growing season to determine soil chemical properties and nutrient concentrations. At harvest, sod samples were also collected to measure nutrient exports from fields. At WFREC, leachate was collected weekly and as needed based on rainfall events. Leachate volumes were measured at each water sampling event and subsamples from the leachate were analyzed for N and P concentrations. Preliminary results indicate that there are treatment differences in percent cover for all grasses. When grass species was combined across sod farms, the N rates of 260 and 330 lbs N/acre/year increased St. Augustinegrass [Stenotaphrum secundatum (Walter) Kuntze] percent cover. Additionally, the yearly rate of 330 lbs N/acre resulted in the greatest bermudagrass percent cover [Cynodon dactylon (L.) Pers. x C. transvaalensis Burtt-Davy]. This experiment is being repeated, and additional analysis will occur after the second harvest cycle has been completed.
Speakers
VA

VICTOR ABARCA

University of Florida
Co-authors
AL

Alex Lindsey

University of Florida
BU

Bryan Unruh

University of Florida
NA
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB

12:15pm CDT

PGR - Asynchrony in blueberries: use of ABA and MeJas to promote earlier coloration under in-vitro conditions
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Blueberries (Vaccinium spp.) exhibit a high degree of asynchrony during flowering, fruit set, and ripening. Fruit pigmentation is highly dependent on direct solar radiation, resulting in significant differences between sun-exposed and shaded berries within the same cluster. This study evaluated the effect of two plant growth regulators (PGRs), abscisic acid (ABA) and methyl jasmonate (MeJas), on fruit coloration and firmness under in vitro conditions. Clusters from two cultivars, ‘Duke’ and ‘Brigitta’, were collected at the green berry stage, two weeks before the expected start of commercial harvest in the 2024–25 season. Half of the clusters were taken from the outer canopy (sun-exposed) and half from the inner canopy (shaded). In the laboratory, clusters were placed in Falcon tubes with their twigs immersed in one of six solutions: (1) water (Control 1), (2) sucrose (Control 2), (3) ABA 500 ppm sucrose, (4) ABA 1000 ppm sucrose, (5) MeJas 0.1 mM sucrose, and (6) MeJas 1 mM sucrose. The samples were maintained in a growth chamber under controlled temperature (22 °C) and photoperiod (16 h light at 70 µmol/m²/sec). Fruit were evaluated at 3, 6, and 9 days post-treatment for coloration (percentage of blue fruit) and firmness (g mm⁻¹). ABA treatments significantly accelerated fruit coloration in both cultivars. In ‘Duke’, ABA-500 and ABA-1000 reached 80% and 100% blue fruit by day 6, respectively, compared to
Speakers
CM

Claudia Moggia

Universidad de Talca
Co-authors
CF

Carlos Figueroa

Universidad de Talca
NA
DS

Daniel Sepulveda

Universidad de Talca
NA
FL

Felipe Laurie

Universidad de Talca
NA
GA

Gustavo A. Lobos

Universidad de Talca
MV

Marcelo Valdes

Universidad de Talca
NA
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Plant Growth Regulation

12:15pm CDT

PGR - Managing Cider Apple Yield and Quality through Crop Load Management
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Many traditional European cider cultivars are known to have biennial bearing tendencies and growers have reported that conventional thinners such as 1-naphthaleneacetic acid (NAA) and 6-benzylaminopurine (6-BA) are ineffective. The goal of this two-year study is to determine the efficacy of plant growth regulators (PGRs) on traditional European cider cultivars in reducing biennial bearing and improving juice and cider quality, while also maintaining sufficient yield to ensure profitability. The chemical thinners used in this study were applied with a backpack sprayer and consisted of the lowest and highest labelled rates of NAA (PoMaxa; Valent BioSciences LLC, Libertyville, IL) and 6-BA (MaxCel; Valent BioSciences LLC, Libertyville, IL) mixed with 1-naphthyl methylcarbamate (Carbaryl; Sevin SL; Loveland Products Inc, Greeley, CO). The chemical thinners were applied to the high-tannin cider cultivars, ‘Binet Rouge’, ‘Chisel Jersey’, ‘Dabinett’, ‘Harry Masters Jersey’, and ‘Porter’s Perfection’. The experiment was conducted at the Cornell research orchards in Ithaca and Lansing, NY, as well as commercial orchards in Walden, Lyndonville, and Trumansburg, NY. Each site was a fully replicated (n = 5) randomized complete block design. Preliminary data found that chemical thinning reduced crop load between 24% and 62% (measured as the total number of fruit per tree) and increased individual fruit weight (measured in grams) between 24% and 70%. Additionally, chemical thinning increased soluble solids concentration in the juice (measured in degrees Brix) between 6% and 29% and increased titratable acidity (measured in grams/liter) between 9% and 29%. These results demonstrate that PGRs can be effectively used to manage crop load for European cider cultivars. A second field season is planned for 2025.
Speakers
OB

Oksana Bihun

Cornell University
Co-authors
GP

Gregory Peck

Cornell University
MB

Michael Brown

Cornell University
NA
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Plant Growth Regulation
  • Subject Plant Growth Regulation
  • Poster # csv
  • Funding Source New York State Department of Agriculture and Markets and the USDA National Institute of Food and Agriculture

12:15pm CDT

PGR - Modification of core phosphorylation in photosystem II assembly using chloroplast transformation.
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Photosynthesis, the process by which light is converted into chemical energy, occurs in chloroplasts and involves two photosystems (PS II and PS I) connected by the cytochrome b6f complex. PS II is responsible for water splitting in oxygenic photosynthesis and is composed of a dimeric core and peripheral antennae. These antennae regulate excitation pressure under varying light conditions, preventing damage to PS II. In high-light environments, dissociation of the antennae is crucial for optimizing light harvesting and enabling self-repair of PS II. Phosphorylation of core proteins, particularly at the Thr2 residue in PsbA (D1) and PsbD (D2), plays a key role in antenna regulation and PS II repair. However, the mechanisms underlying phosphorylation-dependent disassembly of PS II are not well understood. In this study, we generated mutated PsbA and PsbD genes with alanine substitutions at the Thr2 phosphorylation site. These mutated genes were introduced into the chloroplast genome via particle bombardment, and homologous recombination was used to replace the native genes. Characterizing plants with these mutations will provide insight into the role of phosphorylation in the disassembly of PS II, a process crucial for light-harvesting efficiency and repair. This work aims to enhance our understanding of photosynthetic regulation and inform strategies for improving crop efficiency.
Speakers Co-authors
SP

Sujith Puthiyaveetil

Purdue University
NA
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Plant Growth Regulation
  • Subject Plant Growth Regulation
  • Poster # csv
  • Funding Source This work was supported in part by a DOE-Office of Science Grant to SP & AD; Texas A&M AgriLife Hatch Project #TEX0-9950-0, and startup funds from Texas A&M AgriLife Research and Texas A&M University to AD.

12:15pm CDT

PGR - Response of Gillenia stipulata to Ethephon and Far-red Light
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Gillenia stipulata, commonly known as Wester Indian Physic, is an ornamental herbaceous perennial in the Rosaceae family native to the Midwest and Eastern North America. Ethephon has been previously shown to affect plant growth, development and early flowering in apple seedlings. In the present study, interaction of ethephon and light quality on G. stipulata plant growth and development was examined. Plants were grown from seed purchased from Prairie Moon Nursery (Winona, MN) and when 4-5 leaves had been initiated, seedlings were treated with 0 (Control), 500 ppm, 1000 ppm, or 2000 ppm Florel (Monterey Lan
Speakers
SM

Sonja Maki

University of Wisconsin-River Falls
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB

12:15pm CDT

POM 1 - Effect of Cellulose Nanofiber (CNF) as a Potential Cryoprotectant to Reduce Spring Frost Damage in Pear and Apple Cultiv
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Ongoing climate change has resulted in unusually high winter temperatures and earlier spring warming, which have caused major fruit trees to bloom earlier than in previous years. This shift is increasing the risk of spring frost damage, emphasizing the urgent need for eco-friendly, sustainable and cost-effective protective strategies. Considering these, this present study, cellulose nanofiber (CNF), a nanomaterial extracted from plant cell wall cellulose from wood and pulp via mechanical (RE) and chemical (TEMPO) processes, was combined with sodium alginate (AG), a natural substance extracted from seaweed. It was applied as a coating material to provide thermal insulation and assess its effectiveness in protecting pear cultivars ‘Niitaka’ and ‘Wonhwang’ and apple cultivars ‘Hongro’ and ‘Fuji’. As frost damage was forecasted to occur on March 30, 2025, cryoprotectants were applied to apples on March 28, 2025, and pears on March 29, 2025. In pears, treatments were applied to ‘Niitaka’ and ‘Wonhwang’ trees in an orchard in Jinju, Gyeongsangnam-do, South Korea. Five treatments (control, 1.0% RE-CNF, 1.1% TEMPO-CNF, RE:AG=8:2, and TEMPO:AG=8:2) were applied to five trees per cultivar. Spraying was conducted once at the early flower cluster visibility stage (Stage 4) for ‘Niitaka’ and at the half-inch green stage (Stage 3) for ‘Wonhwang’. For apples, treatments were applied to 15 trees each of ‘Hongro’ and ‘Fuji’ cultivars located in an orchard in Hamyang-gun, Gyeongsangnam-do, South Korea. The flower bud stage for both ‘Hongro’ and ‘Fuji’ was at the half-inch green (Stage 4) when a single spray was applied. The study established that in ‘Niitaka’ pears the TEMPO:AG=8:2 treatment achieved the lowest pistil and stamen damage rates at 64% and 83%, respectively, reducing damage by 17% and 11% compared to the control. In ‘Wonhwang’ pears, the pistil damage rate was lowest as 11% with RE-CNF, and the combined pistil and stamen damage rate was lowest as 56% with TEMPO-CNF, showing reductions of 14% and 9% compared to the control. In both ‘Hongro’ and ‘Fuji’ apples, the combined pistil and stamen damage rate was 18% and 7%, respectively, with the TEMPO:AG = 8:2 treatment, showing 12% and 21% reductions compared to the control. In conclusion, the CNF mixtures revealed effective frost protection by significantly reducing frost damage rates in pears and apples. Thus, it is considered the most suitable material for developing cryoprotectants to mitigate spring frost damage in these major fruit crops.
Speakers
avatar for HYUNSUK SHIN

HYUNSUK SHIN

Gyeongsang National University
Co-authors
HJ

HYO JEONG KIM

Gyeongsang National University
NA
PM

PANDIYAN MUTHURAMALINGAM

Gyeongsang National University
NA
SP

SUJEONG PARK

Gyeongsang National University
NA
YP

YEONJU PARK

Gyeongsang National University
NA
YR

YERIM RYU

Gyeongsang National University
NA
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Pomology 2
  • Subject Pomology
  • Poster # csv
  • Funding Source The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This work was carried out with the support of the “Cooperative Research Program for Agricultural Science and Technology Development (Project No. RS-2025-02183070)” funded by the Rural Development Administration, Republic of Korea.
  • Funding Option OREl or ORG funded all or part of the research associated with this abstract

12:15pm CDT

POM 1 - Evaluation of Select Plant Growth Regulators on Improving Fruit Set in Apricot (Prunus armeniaca)
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Apricot (Prunus armeniaca L.) production in Texas is limited by inconsistent and overall poor yields due to spring frost and loss of hardiness in buds associated with erratic temperature swings in late winter/early spring. Several plant growth regulators (PGRs) were evaluated for improving yields. PGRs were applied in the fall and spring to assess their potential for mitigating floral bud injury, improving bud hardiness, enhancing fruit set, and improving fruit retention rates. Two-year-old ‘Wenatchee Moorpark’ trees on ‘KRYMSK-1’ rootstock, spaced at 1.33 by 3.33 meters were used with a randomized complete block design with five single-plant replications. Fall applications were made at approximately 50% natural leaf fall of Ethephon at rates of 100, 200, and 300 mg/L-1, Accede (ACC) at rates of 500, 1000, and 1500 mg/L-1, and ProTone (S-ABA) at rates of 500 and 1000 mg/L-1. Following defoliation of the trees, white latex paint was also applied as a treatment to the entire canopy and trunk of dormant trees. Spring treatments aimed at improving fruit set were applied during full bloom and included Promalin (GA4+7, 6-BA) at rates of 1.17 and 2.34 L/ha-1, and ReTain (AVG) at rates of 889 and 1,778 mg/L-1. Additionally, evaluations were conducted on combination treatments of fall and spring applications. These treatments included Ethephon+Promalin+Latex; Ethephon+ReTain+Latex; Accede+Promalin+Latex, and Accede+ReTain+Latex, which were applied at the highest concentrations for each product evaluated individually in this study. Differential Thermal Analysis (DTA) was carried out on the 15th and 16th of February 2025 using 5 floral buds per tree as sub-samples. LT50 found Accede at 1500 mg/L-1 significantly improved bud hardiness by 4.67°C relative to the control. Additionally, treatments of Accede+Latex, Accede+Promalin+Latex, and all three combination treatments of Ethephon delayed floral bud development relative to control. However, Ethephon produced significant gummosis and visible injuries, whereas Accede produced negligible gummosis. Fruit set, as assessed by counting fruit on 50.8cm lengths of standard sample shoots, was improved using the highest concentration of ReTain (AVG). The mean fruit number increased from 1.2 for the control, to 5.0 for AVG, at P= 0.0002, occurring after exposure to temperatures below -4°C on March 19th. The results from this and future years of this trial are anticipated to assist in improving the feasibility of commercial apricot production within Texas and similar environments.

Speakers Co-authors
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Pomology 2
  • Subject Pomology
  • Poster # csv
  • Funding Source USDA Specialty Crop Block Grant Program
  • Funding Option SCRI funded all or part of the research associated with this abstract

12:15pm CDT

POM 1 - Fruit Weights, Percent Seed, and Soluble Solids Content of Six Advanced Selections from Kentucky State University’s Pawp
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
The North American Pawpaw (Asimina triloba) is a tree fruit native to the Eastern U.S. which is being produced in commercial orchards across the U.S. and internationally, with an increasing market and interest. There are approximately 50 pawpaw cultivars available, but many of these varieties have low yields with fruit sizes below the threshold of 120 grams needed for commercial sale and processing. New high yielding cultivars with excellent fruit quality would further assist in the development of the pawpaw industry. Kentucky State University serves as the National Clonal Germplasm Repository for Pawpaw. Two goals of the Repository research efforts are germplasm acquisition and evaluation. The repository contains over 2000 accessions from 16 different states; additionally, both open pollinated seedlings from superior genotypes and crosses of superior selections have been incorporated into the repository collection. Fruit weights, percent seed by weight, and soluble solids content from six of KSU’s advanced selections (Hi 1-4, Hi 7-1, G4-25, G6-120, G9-109, and G9-111) were compared to the cultivars ‘KSU-Atwood’, ‘KSU-Chappell’, and ‘Ralph’s Whopper’. All advanced selections had average fruit weights over 120 grams with Hi 1-4 having the highest fruit weight (229.8 g). ‘KSU-Chappell’ had the lowest percent seed (4.7%), with Hi 1-4 having the second lowest (5.9%). Hi 1-4 had the highest soluble solids content at 25.9 Brix and all selections examined were above 21 Brix. Several selections including Hi 1-4 and Hi 7-1 show potential to be promising new releases and have been budded onto seedling rootstock for further evaluation.
Speakers
JL

Jeremy Lowe

Kentucky State University
Co-authors
KB

Kirie Broberg

Kentucky State University
NA
KP

Kirk Pomper

Kentucky State University
Dr. Kirk W. Pomper is the Professor of Horticulture in the College of Agriculture, Community, and the Sciences at Kentucky State University in Frankfort, Kentucky. As Horticulture Research Leader, his program is focused on research and Extension efforts toward developing pawpaw as... Read More →
PB

Page Barker

Kentucky State University
NA
SC

Sheri Crabtree

Kentucky State University
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Pomology 2
  • Subject Pomology
  • Poster # csv
  • Funding Source Evans Allen

12:15pm CDT

POM 1 - Hawk238: A Unique Pawpaw Selection for Kentucky Production?
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
The North American pawpaw (Asimina triloba (L.) Dunal) is a native tree fruit that is in the early stages of commercial production. According to the 2022 Census of Agriculture, there are over 90 commercial pawpaw growers in Kentucky. Pawpaw fruit has fresh market appeal for farmers' markets, community-supported agriculture, and organic markets, as well as processing potential for frozen pulp production. There are approximately 50 pawpaw cultivars commercially available. Kentucky State University has already released three pawpaw cultivars: KSU-Atwood™ in 2009, KSU-Benson™ in 2016, and KSU-Chappell™ in 2018. However, additional high-quality cultivars are needed. Pawpaw varieties with fruit weights over 120 g per fruit are considered to have a large enough fruit size for commercial sale and processing. New high-yielding cultivars with excellent fruit quality would further assist in the development of the pawpaw industry. Kentucky State University serves as the National Clonal Germplasm Repository for Pawpaw. Two goals of the Repository’s research efforts are germplasm acquisition and evaluation. The selection Hawk238 was identified by a private grower as having a unique fruit type and promising characteristics as a potential new cultivar. In 2024, the fruit size and quality of the pawpaw cultivars Susquehanna and Shenandoah were compared to Hawk238. Fruit size was similar among ‘Susquehanna,’ ‘Shenandoah,’ and Hawk238, averaging 190 g, 155 g, and 154 g, respectively. The Brix of ripe fruit pulp was significantly lower in ‘Shenandoah’ (17.7 Brix) compared to ‘Susquehanna’ (25.4 Brix) and Hawk238 (24.3 Brix). The selection Hawk238 has a pleasing orange flesh with a mild banana-mango flavor and a large fruit size that would be excellent for processing. This selection, Hawk238, will be included in additional trials.
Speakers
avatar for Kirk Pomper

Kirk Pomper

Professor-College of Agriculture, Kentucky State University
Co-authors
JL

Jeremy Lowe

Kentucky State University
SC

Sheri Crabtree

Kentucky State University
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Pomology 2
  • Subject Pomology
  • Poster # csv
  • Funding Source USDA Evans Allen Capacity Funding

12:15pm CDT

POM 1 - Hi1-4 and Hi7-1: Yield Data on Two Promising New Selections from Kentucky State University’s Pawpaw Breeding Program
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
The North American pawpaw (Asimina triloba) is a tree fruit native to North America, and is being produced on a small scale commercially across the U.S. and internationally, with over 90 pawpaw growers in Kentucky alone. There are approximately 50 pawpaw cultivars available, but some of these varieties tend to be poor quality, low yielding, have small fruit size, or exhibit poor flavors. Kentucky State University’s pawpaw breeding program is striving to develop new improved pawpaw cultivars with good flavor and high yields. A pawpaw variety trial was established at the Kentucky State University Harold R. Benson Research and Demonstration Farm in Frankfort, KY, in 2017 consisting of two commercially available cultivars (‘KSU-Benson’ and ‘KSU-Chappell’) and two KSU advanced selections (Hi1-4 and Hi7-1). Data on number of fruit and clusters per tree and fruit weights were collected to compare advanced selections Hi1-4 and Hi7-1 to KSU-Benson and KSU-Chappell. The advanced selections Hi1-4 and Hi7-1 had large average fruit weights of 213 g (Hi1-4) and 167 g (Hi7-1). The cultivars KSU-Benson (179 g) and KSU-Chappell (234 g) also had large marketable fruit. Pawpaw fruit over 120 g are generally considered to be large enough for commercial sale and processing. Hi1-4 and Hi7-1 had an average yield of 12.8 kg and 12.0 kg per tree respectively in 2024, compared to KSU-Benson and KSU-Chappell with average yields of 16.9 kg and 27.2 kg respectively. Advanced selection Hi1-4 (1.7) and cultivar KSU-Benson (1.8) averaged under 2 fruit per cluster, while Hi7-1 (2.1) and KSU-Chappell (2.5) averaged slightly over 2 fruit per cluster. It is desirable for pawpaws to have fewer fruit per cluster and more single fruit, for ease of harvesting. Hi1-4 and Hi7-1 have large, flavorful fruit and high yields, and are planned to be released as new cultivars from the KYSU pawpaw breeding program in Fall 2025.
Speakers
SC

Sheri Crabtree

Horticulture Research and Extension Associate, Kentucky State University
Co-authors
JL

Jeremy Lowe

Kentucky State University
KP

Kirk Pomper

Kentucky State University
Dr. Kirk W. Pomper is the Professor of Horticulture in the College of Agriculture, Community, and the Sciences at Kentucky State University in Frankfort, Kentucky. As Horticulture Research Leader, his program is focused on research and Extension efforts toward developing pawpaw as... Read More →
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Pomology 2
  • Subject Pomology
  • Poster # csv
  • Funding Source USDA Evans-Allen Research

12:15pm CDT

POM 1 - Influence of propagation method and irrigation level on coarse root system architecture of Prunus rootstocks
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Root system development in perennial crops is critical for the long-term survival of trees. Long lived coarse roots form the rigid structure that supports the dynamics of the absorptive fine root system. The woody root scaffold developed early in a tree’s life can shape lasting aspects of mature root system structure and function, including the extent of soil exploration. Research on early root scaffold development under different propagation and field management conditions has untapped potential for orchard system improvement. Rootstock propagation method significantly influences root system architecture (RSA). Seed propagation in Prunus species produces a vertically oriented taproot at germination, with lateral roots developing along this main axis. In contrast, clonally propagated rootstocks (e.g., cuttings, tissue culture) develop adventitious roots from a wound site or callus, often resulting in shallower, clustered root systems emerging from a concentrated point of origin. While clonal propagation exhibits trait uniformity and a high rate of initial root production, excessive root crowding and limited vertical distribution could lead to structural deformities, increased susceptibility to soil-borne disease, and reduced soil exploration for water and nutrients as trees mature. Studies have shown that a greater number of roots increases initial transplanting success, but a profusion of scaffold roots may result in competition for space, leading to permanent changes in RSA detrimental to long-term tree health. This study examines RSA traits (the spatial configuration of roots, including distribution, morphology, and topology) for coarse roots in commercial almond rootstock cultivars that were either seed or clonally propagated and subjected to full or deficit irrigation regimes. We evaluate how propagation method influences root angle (deep water access), scion growth (survival and vigor), root crowding (potential disease risk), and root distribution (soil exploration) in this 3-year common garden experiment. We found that rootstock significantly influenced traits like mean root diameter and convex hull (p < 0.05), suggesting genotypic differences in root vigor and extension into the soil profile. Propagation method did not significantly affect root angle after the first season, but prolonged exposure to deficit irrigation conditions in succeeding years will be important to understanding the adaptive capacity of these traits over time. As climate variability intensifies, understanding how rootstock propagation impacts RSA traits–particularly those relevant for accessing water stores, such as deeper root systems, elevated root vigor, and greater root length density at depth–will be essential for improving almond production in drought conditions, suboptimal soils, and other marginal environments.
Speakers
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB
  Poster, Pomology 2

12:15pm CDT

POM 1 - Phenological Modeling of Pollinizing Crabapple Cultivars (Malus spp.) and Commercial Apple Cultivars (Malus X domestica Borkh.) in Kentucky
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Apple (Malus X domestica Borkh.) cultivars require a pollinizer for cross-pollination to ensure fruit set when planted in contiguous blocks found in modern apple orchards. The overlap of bloom time between pollinizing crabapples (Malus spp.) and commercial cultivars is a critical component for adequate fruit set to occur. Bloom time and duration is correlated with temperature, suggesting this relationship could be influenced by climate change. Understanding the influence temperature has on bloom phenology of these pollinizing crabapples is important to ensure proper cultivar and pollinizer combinations are made by growers. 4 commercially available pollinizing crabapple cultivars (‘Indian Summer’, ‘Mt. Blanc™’, ‘Mt. Evereste™’, ‘Snow Drift’) were replicated 5 times in completely randomized design. In spring of 2024 and 2025, pollinizers were analyzed 1-2 times per week for developmental stages from silver tip to petal fall. These two years represented one of the warmest and then coldest springs on record in Kentucky, respectively. Commercial apple cultivars were also analyzed for comparison. The stage progression data for each pollinizer cultivar was modeled using growing degrees days (GDD) base 6.6°C. In both observed years, the first crabapple to bloom was ‘Indian Summer’ and the final crabapple to bloom was ‘Mt. Blanc™’. In the first year, ‘Indian Summer’ bloomed on Julian Day (JD) 88 at 166.4 GGD and in the second year bloomed on JD 92 at 179.8 GDD. 'Mt. Blanc™’ bloomed on JD 104 at 250.1 GDD and 244.9 GDD in years one and two, respectively. In year one, ‘Gold Rush’ began bloom on JD 97 at 199.4 GDD, which overlapped with ‘Mt. Evereste™’ and ‘Snow Drift’, whereas in the second year ‘Gold Rush’ began bloom on JD 93 at 179.4 GDD and stopped blooming on JD 108 at 279.8 GDD, which overlapped with ‘Mt. Evereste™’, ‘Snow Drift’, and ‘Mt. Blanc™’. There was little bloom overlap in 2024, with the earliest crabapples blooming earlier and more rapidly than the cultivars. In 2025, bloom overlap improved but little overlap occurred with more than two pollinizers at a time. These results show bloom overlap can be influenced by different temperature patterns during winter and spring, and pollinizer selection needs to be carefully considered. It can be concluded that using growing degree-days can help predict bloom time for pollinizers. In Kentucky, limited bloom overlap of apples and pollinizers could indicate a concern for northern apple growing regions as spring temperatures become more variable with climate change.
Speakers
ES

Elayna Stirn

University of Kentucky
Co-authors
BA

Brent Arnoldussen

University of Kentucky
NA
MW

Miranda Woodcock

University of Kentucky
Wednesday July 30, 2025 12:15pm - 1:00pm CDT
Empire AB

12:59pm CDT

Wednesday Poster Session - 4
Wednesday July 30, 2025 12:59pm - 1:45pm CDT
Wednesday July 30, 2025 12:59pm - 1:45pm CDT
Empire AB

1:00pm CDT

OPB - Visual color of redbud flowers depends on key anthocyanins
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Redbud (Cercis spp.) trees provide colorful spring bloom in much of North America. Although most genotypes are green-leaved, some cultivars have been developed with yellow, red, or purple leaves. Depending on genotype, flowers can be white, pink, purple, or red. Previously we found that leaf petioles from red or purple flowered redbuds contain peonidin-3-glucoside, purple-flowered redbuds also contain malvidin-3-glucoside, red-flowered redbuds lack appreciable malvidin-3-glucoside, and white flower types lack either pigment. In the current study, we followed the anthocyanins present in the calyx, petal, and pedicel of flowers in purple, red, yellow and green leaved genotypes to determine pigment profile continuity and possible leaf color influence on pigments. A total of 30 cultivar/genotypes of redbud flowers were used, including C. chinensis, C. glabra, C. canadensis, and C. canadensis ssp. texensis, mexicana. Calyx, petal, and pedicel of 20 cultivars were also subjected to extraction of pigments with acidified methanol and identification of anthocyanins using HPLC and PDA. Overall, visual categorization of flowers as red or purple and flower components correlated with the presence (purple) or absence (red) of malvidin 3-glucoside. Purple flowers from red or purple-leaved redbuds had a more diverse anthocyanin profile and were 1.5 to 3 fold higher in total anthocyanin than those from green-leaved redbuds. Red flowers were dominant in peonidin-3,5-diglucoside. These studies demonstrate that multiple flower tissues will yield similar anthocyanin profiles in redbud flowers, and that the genetics affecting leaf color can also influence the amount of pigment in redbud flowers. Additionally, the redbud species and genotypes used in this study appear to exhibit a pattern of flower pigmentation controlled by synthesis of malvidin-3-glucoside and peonidin-3-glucoside.
Speakers Co-authors
GM

Guoying Ma

North Carolina State University
NA
HC

Hsuan Chen

North Carolina State University
NA
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB

1:00pm CDT

OPB - ‘Sunshine’, ‘Lemondrop’, ‘Chico’, and ‘Sundrop’, Four New Ornamental Rhizoma Perennial Peanut Cultivars (Arachis glabrat
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Arachis glabrata is a drought resistant, low maintenance, pest resistant, nitrogen fixer, ornamental ground cover used in tropical and subtropical climates. Although popular in landscapes in the State of Florida for its attractive leaf color, low maintenance needs, orange flowers, and low mowing requirements, there is only one A. glabrata ornamental cultivar available in the market: ‘EcoTurf’. ‘EcoTurf’ is dual purpose cultivar (ornamental/hay) due to its low height (15-20 cm), compared to the many hay cultivars available. The University of Florida/IFAS Ornamental Perennial Peanut Breeding Program has been developing, trialing, and selecting lines with unique or improved ornamental characteristic, all developed by single rhizome descent at the UF/IFAS North Florida Research and Education Center. ‘Sunshine’ is a profuse bloomer with flowers almost double the size than ‘EcoTurf’, bright orange flowers, and waxy leaves. ‘Lemondrop’ is the only A. glabrata cultivar with yellow flowers, compact and dense foliage, and waxy leaves. ‘Chico’ has glaucous, dark-green leaves, and a dense and compact foliage. And ‘Sundrop’ with yellow-orange flowers, a long flowering period, and dark-green, glaucous, dense and compact foliage. All these new cultivars have a lower grower habit (10-15 cm) than the current industry standard ‘EcoTurf’. These new cultivars of Ornamental Rhizoma Perennial Peanut bring a new pallet of leaf types, flower size, flower color, and growth habit to the ornamental market, with great potential to be used in landscapes across the southeastern US.
Speakers
avatar for Leynar Leyton

Leynar Leyton

Assistant Professor, University of Florida
Co-authors
AB

Ann Blount

UF/IFAS North Florida Research and Education Center
NA
BU

Bryan Unruh

UF/IFAS West Florida Research and Education Center
NA
CM

Cheryl Mackowiak

UF/IFAS North Florida Research and Education Center
NA
GK

Gary Knox

UF/IFAS North Florida Research and Education Center
NA
KT

Kelly Thomas

Chicago Botanical Garden
NA
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB

1:00pm CDT

ORGH 2 - Biofumigation Blast: Battling Soil-Borne Bacteria Organically
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Soil-borne bacterial pathogens pose a significant threat to organic onion production as there is a lack of effective pathogen control practices for both conventional and organic systems. Burkholderia cepacia (causal agent of sour skin) and B. gladioli pv. alliicola (causal agent of slippery skin) are prevalent throughout the onion growing regions of the U.S., including Georgia. Organic growers rely on cultural practices to combat soil-borne diseases, pests, and weeds. Plants in the Brassica family contain glucosinolates which undergo hydrolysis and produce isothiocyanate volatiles serving as a biofumigant. Biofumigation has shown to be successful at reducing diseases, but efficacy is dependent on pathogen, environmental conditions, cover crop biomass, and soil conditions. The objective of this study aims to determine biofumigation effect on soil-borne bacterial pathogens associated with Burkholderia spp. This study was conducted on organic certified land using B. juncea ‘Pacific Gold’ for mustards and A. cepa ‘Sweet Tule’ for short-day onion crop. Mustards were grown and terminated at flower initiation with biofumigation treatments including mustard incorporated into soil, mustard incorporated into soil and covered with polyethylene mulch, and a no mustard control. To evaluate effectiveness of biofumigation, measurements on weed seed germination and biomass, disease incidence/severity in bulbs, and onion yield were measured. Weed seed germination was evaluated before and after the incorporation of the mustards. Weed biomass was measured at multiple time points throughout the onion growing season. At harvest, onions were graded according to the USDA standards (Colossal, Jumbo, Medium, and Cull). Bulbs were evaluated for the presence of both diseases at harvest. Post-harvest evaluation of bulbs was also conducted. A 50 bulb sub-sample/plot/treatment was placed in storage (-2 °C, 70% RH) for a period of 90 days. After storage, bulbs were sliced, and disease incidence/severity was recorded. At mustard termination, dry biomass among all treatments averaged 4,540.5 lbs/acre. Eleven weeks after mustard incorporation, treatments with plastic mulch following mustard incorporation had significantly less weeds than the control treatments.
Speakers
JP

James Pulliam

University of Georgia
Co-authors
KC

Kate Cassity-Duffey

University of Georgia
TC

Timothy Coolong

University of Georgia
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Organic Horticulture 1

1:00pm CDT

ORGH 2 - Effect of water-soluble organic fertilizer on the growth and development of highwire cucumbers grown in controlled envir
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Organic produce sales have increased over time as many consumers are willing to pay a higher price for organically-grown produce compared to conventionally-grown. Previous research has shown that liquid organic fertilizers outperform substrate-incorporated organic fertilizers in containerized production with soilless substrates. Therefore, developing new production protocols with water soluble organic fertilizers may increase yield and provide easier nutrient management. The objective of the current study was to identify water-soluble organic fertilizer combinations for growth and development of cucumber, Cucumis sativus ‘Picolino F1’, grown in a 40:60 wood fiber : coir substrate for ten weeks. Five fertilizer treatments were: molasses-based Pre-Empt (PE) at either 120 or 170 mg.L-1 nitrogen (N) in combination with 100 mg.L-1 calcium (Ca) from either calcium chloride (CaCl2) or FoxFarm’s Cal-Mag. A synthetic fertilizer treatment (Hydro-Gro Vine; N: 4.40% - P: 13.00% - K: 34.00% and calcium nitrate) was included as a control. The Cal-Mag 170 mg.L-1 N treatment had a similar yield to the control. However, there was no significant difference between all organic treatments for growth parameters measured. Additionally, leaf tissue analyses revealed boron increased by 22% to 37% and manganese by 37% above the sufficiency range for most of the organic fertilizer treatments. Meanwhile, N and potassium (K) concentration dropped below the required range by 45% and 49%, respectively, in all organic treatments. Future experiments will identify sources of supplemental N and K with the goal of supplying sufficient levels of all macro and micronutrients using water soluble organic fertilizers.
Speakers
JM

JOANNA MOINE

The Ohio State University
Co-authors
AT

Anna Testen

USDA-ARS
NA
MK

Matthew Kleinhenz

The Ohio State University
NA
US

Uttara Samarakoon

The Ohio State University
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Organic Horticulture 1
  • Subject Organic
  • Poster # csv
  • Funding Source USDA-NIFA NCR-SARE

1:00pm CDT

ORGH 2 - Enhancing Mineralization Pattern of Organic Nutrient Sources Through Natural Amendments
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Organic materials such as meat and bone meal (MBM; rendering product) and treated manure products can be excellent fertilizers due to balanced availability of nutrients. In this study, we investigated the influence of natural amendments (NAs), specifically sulfur and neem oil, on nitrogen (N) mineralization dynamics from MBM and treated manure solids upto 63 days of incubation under controlled environment at 4 different time points (7th, 21st, 35th and 63rd days). Soil incubation experiments revealed distinct mineralization patterns between MBM and treated manure solids. MBM exhibited a faster N mineralization rate compared to treated manure solids. MBM treated with sulfur (25% of N) showed the highest net N mineralization rate (49.83%) as compared to untreated MBM (40.91%) by day 21. However, when MBM was amended with Neem oil (10% of N), the net N mineralization decreased significantly to 36.68% by day 21. There was no statistical difference observed between MBM, MBM with sulfur (25% of N), MBM with neem oil (10% of N) for net N mineralization at day 7. Similarly, treated manure solids with sulfur (25% N) non significantly reduced net N mineralization to 8.86% and 2.13% at 21 day and 7 days respectively. Further, we will be evaluating the effect of these treatments on soil biological health and C, N and P enzymatic activity. This comprehensive evaluation aims to provide insights into optimizing the use of natural amendments for strengthening nutrient management in organic agricultural systems.
Speakers
avatar for Ashok Sah

Ashok Sah

Clemson University
I am a Ph.D. student working on anaerobic soil disinfestation (ASD) technique, its application for nutrient and weed management in horticultural crops (watermelon).
Co-authors
BJ

Bhupinder Jatana

Clemson University
TG

Tom Grayson Sanders III

Clemson University
NA
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Organic Horticulture 1
  • Subject Organic
  • Poster # csv
  • Funding Source USDA

1:00pm CDT

ORGH 2 - Role of Chlorella Application on Yield and Phytochemical Composition of Mustard Greens
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Role of Chlorella Application on Yield and Phytochemical Composition of Mustard Greens Sam Pratt1*, Shivani Kathi1, Steve Phillips2, and Justin Moss1 1Department of Horticulture and Landscape Architecture, Oklahoma State University, Stillwater, OK, 74078 2Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK, 74078 *Presenting author- Samatha.pratt@okstate.edu Organic nitrogen fertilizers have lower percentage of nitrogen than their chemical counterparts. Furthermore, nitrogen from organic fertilizers tend to be less readily available. Chlorella (Chlorella vulgaris) has been used as a biofertilizer in horticultural crop production in controlled environment production systems due to its role in nitrogen fixation. However, research gaps exist in the application of chlorella biofertilizer in open-field production systems. The goal of this research is to assess the impact of microalgae biofertilizers on crop productivity and nutritional quality of mustard green grown in open-field conditions under 100% nitrogen and nitrogen-deficit (50%) conditions. Treatments included chlorella applied through foliar spray, soil application, and a combination of foliar and soil arranged randomized complete block design in four blocks. Data was collected on yield (i.e., marketable and total yield) and nutrient composition of leafy greens (chlorophyll, carotenoids, and mineral nutrients composition). Soil application of chlorella under 100% fertilizer rate was more effective application method for the overall impact on yield. The crops that received lower amount of fertilizer and chlorella treatment had the lowest yield. Future research should focus on addition of Chlorella in different crop production systems with different organic fertilizers for additional nitrogen sources in low chemical input and organic based production systems.
Speakers
SP

Samantha Pratt

Oklahoma State University
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Organic Horticulture 1

1:00pm CDT

ORGH 2 - Root to Shoot: Strawberry Cultivar Growth Responses to Anaerobic Soil Disinfestation
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
With the goal of elucidating the influence of anaerobic soil disinfestation (ASD) on organic strawberry production, plant growth responses of strawberry cultivars to ASD treatments under Florida sandy soil conditions were evaluated in this study across two locations. In both locations (Balm and Citra), a split-plot design with four replications was used in the field trial with the ASD treatment as the whole plot factor and the strawberry cultivar as the subplot factor. The three-week ASD treatments consisted of 13.9 m³/ha molasses combined with Everlizer 3-3-3 (a heat-processed poultry manure organic fertilizer) at either 9.5 (ASD1) or 14.25 Mg/ha (ASD2) in comparison with the no ASD control, while the strawberry cultivars included ‘Ember’, ‘Encore’, ‘Florida Brilliance’, ‘Florida Medallion’, ‘Florida Pearl’, and ‘Florida127’. Destructive sampling was conducted at mid-season and final harvest. Significant effects of ASD treatment and strawberry cultivar were observed for most measured traits, with no significant interaction observed. Across locations and plant stages, ASD treatments significantly enhanced shoot fresh weight and dry weight, crown diameter and number, and leaf number relative to the no ASD control. At Balm, ASD2 increased shoot fresh weight and dry weight by 21% and 9%, respectively, compared with the no ASD control at final harvest. Similar trends were observed at Citra, where ASD2 resulted in higher shoot fresh weight and dry weight by 29% and 31%, respectively, in comparison with the control. In contrast to the no ASD control, both ASD treatments led to greater crown diameters and leaf numbers. At Balm, ‘Florida127’ produced the highest shoot biomass and leaf count, while ‘Florida Brilliance’ maintained the largest crown diameter and high shoot biomass across plant stages. At Citra, ‘Encore’ and ‘Florida Brilliance’ exhibited the highest shoot biomass at final harvest. The relationship between plant growth measurements and fruit yield components will be further examined in the follow-up analysis. Collectively, these results provide a physiological basis for selecting strawberry cultivars for organic systems and understanding genotype by soil treatment interactions toward exploring the linkage between soil health, plant health, and crop productivity.
Speakers
BA

Bikash Adhikari

University of Florida
NA
Co-authors
DM

David Moreira

University of Florida
NA
ER

Erin Rosskopf

USDA-ARS U.S. Horticultural Research Laboratory
NA
IV

Isaac Vincent

University of Florida
NA
JH

Jason Hong

USDA Agricultural Research Service
NA
JD

Johan Desaeger

University of Florda
NA
NX

Nan Xu

University of Florida
NA
XZ

Xin Zhao

University of Florida
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Organic Horticulture 1
  • Subject Organic
  • Poster # csv
  • Funding Source This work is supported by the Organic Agriculture Research and Extension Initiative program, project award no. 2021-51300-34914, from the U.S. Department of Agriculture’s National Institute of Food and Agriculture
  • Funding Option OREl or ORG funded all or part of the research associated with this abstract

1:00pm CDT

ORGH 2 - The Performance of Three Cabbage Varieties Grown Organically with Clover Living Mulches and Reduced Tillage Methods
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Cabbage (Brassica oleraceae var. capitata) is a cool-season cash crop impacted by changing climates and hot summers. Fall-planted cabbage is a common practice hindered by warm-season weed competition during transplanting. This 2023 and 2024 study at the SDSU Southeast Research Farm, Beresford, SD, USA, investigated the impact of established clover living mulch on growth and yield of three fall cabbage varieties with different maturity periods. The varieties selected were Farao (65 DTM), Famosa (81 DTM), and Deadon (105 DTM). One year prior to cabbage planting, three clover cultivars were established: ‘Domino’ white clover (Trifolium repens), ‘Aberlasting’ white x kura clover (T. repens x ambiguum), and ‘Dynamite’ red clover (Trifolium pratense) which were compared to bare-ground control plots. Within each clover whole plot there were four in-row soil management subplots (till, till landscape fabric, no-till, no-till landscape fabric). Combinations of clover, soil management, and cabbage variety were compared for cabbage health, weed suppression, and marketable yield. Harvested cabbage heads were graded in accordance with the USDA Marketable Standard for cabbage cash crop production. Weed biomass decreased as the season progressed and mid-season drought conditions decreased clover growth. The in-row soil treatments demonstrated significant differences for clover and weed biomass accumulation (p < 0.0001). Regardless of variety, cabbage yield and transplant survival decreased within all no-till treatments; this was often due to very small and soft heads. ‘Fararo’ and ‘Famosa’ varieties matured faster than ‘Deadon’, resulting in the cash crop outcompeting weed and clover competition. Clover treatments had the highest impact on the yield of US Number 1 marketable heads (p = 0.02). Cabbage yield within the US Commercial and Unmarketable categories were not impacted by the clover treatments (p = 0.4 and p = 0.06, respectively). The impact of soil management treatments varied depending on the clover variety and cabbage variety combinations. The findings of this study suggest that clover living mulch systems reduce weed competition, minimizing farmers’ workload throughout the season. Within the planting beds, utilization of landscape fabric within no-till treatments is recommended to guard against yield loss. Use of tillage produced marketable crops for all cabbage varieties, yet yield depended on the clover and cabbage variety combination. Organic farmers who grow cabbage within a living mulch system could utilize the living mulch as a benefit for weed suppression in pathways but need supplementary strategies to optimize yield production within the crop row.
Speakers
KH

Kristina Harms

South Dakota State University
Co-authors
JF

Joslyn Fousert

South Dakota State University
NA
KL

Kristine Lang

South Dakota State University
TN

Thandiwe Nleya

South Dakota State University
NA
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Organic Horticulture 1

1:00pm CDT

ORGH 2 - Using No-till Summer Cover Crops for Transitioning Organic Broccoli Production.
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
As the demand for organic products increases so does the need of organically managed land. In the southeast, where affordable and arable land has become scarcer and more expensive, organic farmers can choose to transition derelict farmland and old pastureland systems to expand current or begin new operations. However, this marginal land is commonly in need of fertility inputs and dominated by perennial weed species. The transition process can prove to be very time and effort consuming. Through the use of no-till drill seeded cover crops, poultry litter applications, and organic fertilizer applications farmers could reduce the thresholds for transitions while potentially reducing weeds, adding instant fertility, and helping build soils for quick turnaround of vegetable cash-crops. Therefore, the objective of this field study was to determine the effects of no-till drill seeded summer cover crops (Sorghum-Sudangrass and Vigna unguiculata) and tarping, with and without the addition of poultry litter, on subsequent fall broccoli production in Georgia. This was a two-year field study on broccoli with the first implementation taking place in the fall of 2023 and the second in the fall of 2024. No-till drilled cover crops and tarps were applied/planted in early May both years with and without the application of poultry litter in a randomized complete split block design. Cover crops were then flail mowed and incorporated in early August both years. Plots were rototilled the first week of September and Brassica oleracea var. italica cv. Belstar was planted with 0.45-m in row spacing in two rows on 0.18-m beds. Broccoli was harvested, counted, and separated into marketable yield or unmarketable yield. Soil cores were taken throughout both the cover crop and cash crop season with measurements of soil nutrients, inorganic nitrogen, and nitrogen mineralization potential being outlined. In 2023 and in 2024 plots that received the combined treatments of silage tarps, poultry litter, and organic fertilizer had the highest marketable yield average of 10013 kg/ha and 8623kg/ha. In 2023 the plots that received the treatments of sudex, no poultry litter, and no fertilizer preformed the poorest in terms of marketable yield, garnishing an average of 2429 kg/ha; while in 2024 the plots that received a silage tarp, no poultry litter, and no fertilizer preformed the poorest with an average marketable yield of 5614 kg/ha.
Speakers
ZH

Zachary Hirsch-Santagata

University of Georgia
Graduate student in the Horticulutre Dept. at the University of Georgia working in organic vegetable production
Co-authors
CS

Charles Smith

University of Georgia
NA
JP

Johnathan Pulliam

University of Georgia
KC

Kate Cassity-Duffey

University of Georgia
NB

Nick Basinger

University of Georgia
NA
TC

Timothy Coolong

University of Georgia
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Organic Horticulture 1

1:00pm CDT

PBIG - Developing Efficient Biotechnological Approaches for Sweetpotato Virus Detection and Removal.
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
As a member of Convolvulaceae family, sweetpotato (Ipomoea batatas L.) is an important crop for food security. As one of the top three vegetable crops grown in Mississippi, one major limitation to sweetpotato production is the cumulative effect of virus infection leading to cultivar decline and yield losses. To produce virus-tested sweetpotato seedlings, we developed meristem-tip culture technology combined with heat treatment to provide farmers with healthy propagating materials that are free of detectable viruses. In this study, totally 30 lines of sweetpotato have been collected in Mississippi and beyond. The plants were first examined with the infection of five of the most prevalent viruses by using nucleic acid-based polymerase chain reaction (PCR) and reverse-transcription PCR (RT-PCR) techniques, which showed high sensitivity and confirmation at the genomic level of viral species and strains. Primers targeting to conserved regions of the know sweetpotato viruses were used for this nucleic acid based detection. The effective protocols for sweetpotato viral detection and viral removal were well developed in this study. The optimized protocols have been used for the purpose of viral detection and eradicating from elite sweetpotato lines in Mississippi. Virus-free planting material has been propagated in Agriculture Research Station of Alcorn State University for performance evaluation.
Speakers
YM

Yan Meng

Alcorn State University
Co-authors
CZ

Chunquan Zhang

Alcorn State University
NA
SB

Sandra Barnes

Alcorn State University
NA
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Plant Biotechnology

1:00pm CDT

PBIG - Development of an inoculation system for powdery mildew of Hydrangea macrophylla
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Bigleaf hydrangea, Hydrangea macrophylla, is a popular ornamental shrub beloved worldwide for its large colorful inflorescences. As of 2019, bigleaf hydrangea topped $155 million in total sales in the United States. However, diseases impact the health, appearance and ultimately the salability of bigleaf hydrangea. One such disease is powdery mildew, caused by the fungus Golovinomyces orontii. Powdery mildew is a biotrophic obligate, which means that it will only grow on a living host, making it particularly hard to investigate. Inoculating plants via tapping infected leaves against clean leaves is the most common inoculation method; however, this method results in an unknown amount of inoculum and inconsistent infection. Quantifiable and consistent methods are needed to accurately and reproducibly study powdery mildew disease of bigleaf hydrangea. The purpose of this experiment was to compare two inoculation methods, an inoculation box and spray inoculation method, for inducing powdery mildew disease in bigleaf hydrangea. For the box inoculation, 6 infected leaves per plant were tapped above a 48-micron mesh and gently dusted through to land on the plant surface. A still air chamber was designed to be set over the box so that powdery mildew does not get disturbed by air currents. For the spray inoculation, 6 infected leaves per plant were combined into a spray by rinsing the leaves with deionized water, adding Tween 20 to aid with even dispersion and applied to the plant using a spray bottle. Powdery mildew was then evaluated on a scale of 0-100% and the area under disease progress curve (AUDPC) was calculated. The final disease severity of hydrangea inoculated via the box and spray method after 4 weeks of observation were 10.0 and 20.0%, respectively. These results will provide valuable information on more consistent inoculation methods using powdery mildew.
Speakers
CJ

Christina Jennings

Tennessee State University
NA
Co-authors
FB

Fulya Baysal-Gurel

Tennessee State University
NA
LA

Lisa Alexander

USDA-ARS U.S. National Arboretum
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB

1:00pm CDT

PBIG - Genome editing for enhancing blueberry fruit quality
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Blueberry (Vaccinium spp.) is one of the most economically important woody plant species because its fruit is rich in antioxidants such as anthocyanin, which offer beneficial effects on human health. Thus, the demand for blueberry production and for the development of novel elite cultivars has been continuously increasing. Although new blueberry cultivars have been developed by cross breeding for more than a century, the conventional breeding approaches are time-consuming and labor-intensive due to the associated characteristics that hinder efficient breeding such as long juvenile phase, polyploidy, and heterozygosity. Genetic engineering offers a promising approach to confer a desirable trait to elite cultivars. In particular, the recently developed genome editing technology enables precise modifications of plant genomes. We aim to apply genome editing to improve agronomically important traits in blueberry, specifically anthocyanin and sugar content. Towards the development of high anthocyanin blueberry, we targeted an anthocyanin repressor gene, VcMYBC2. So far, we successfully obtained 3 lines with all-alleles of VcMYBC2 were mutated. An increase in anthocyanin content in fruit is expected in the mybc2 mutants. Regarding sugar content, we targeted invertase inhibitor (INVINH) gene that is involved in sugar metabolism. Invertase promotes sucrose unloading in the fruit by maintaining a gradient of sucrose concentration between source leaves and fruits, while INVINH represses this process. Thus, higher sugar accumulation is expected in invinh mutants. Three transgenic lines harboring CRISPR-Cas9 vectors targeting VcINVINH genes that are highly expressed in fruit tissue, were obtained. The mutated allele frequencies of the mutants ranged from 21-67%. Additionally, we generated transgenic blueberries overexpressing FLOWERING LOCUS T (FT), a mobile florigen signal gene that induces flowering. A previous study demonstrated that blueberry scions grafted to FT-overexpressing lines could show early flowering. We thus assume that the mybc2 and invinh mutants may flower earlier when they are grafted onto the FT overexpressing rootstock, which will accelerate our fruit phenotype evaluations. The FT-overexpressing rootstock may also be utilized to facilitate the production of null-segregant mutants.
Speakers
MO

Masafumi Omori

Kyoto University
Co-authors
HY

Hisayo Yamane

Kyoto University
NA
RT

Ryutaro Tao

Kyoto University
NA
SF

Shuma Fujiyama

Kyoto University
NA
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB

1:00pm CDT

PBIG - Genome-wide Mining and Characterization of the SULTR Gene Family in Tomato (S. lycopersicum)
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Sulfur (S) is an essential nutrient present in nearly all proteins as well as numerous secondary metabolites and critical biochemical intermediates. Research across many crop species has demonstrated that post-stress S fertilization can improve plant recovery from various abiotic and biotic stresses. Furthermore, reported findings from these studies suggest that, in the absence of stress, enhanced S fertilization improves the expression of enzymes and metabolites with known stress-defense functions. As part of a new project seeking to test the impact of pre-stress tomato S status on heat stress resilience, we conducted a genome-wide mining and characterization study of the tomato sulfate transporter (SULTR) gene family. Following the typical steps in similar genome mining studies, we identified 14 putative SlSULTR genes through a BLASTp search of known A. thaliana SULTR proteins in the Phytozome database. Then, phylogenetic relationships between the putative SlSULTR genes were characterized using a neighbor-joining tree method after aligning the sequences with the MUSCLE algorithm in MEGA v12. The putative genes were also characterized for their exon-intron structure and intron cycle, which were retrieved from Phytozome and the GSDS server, respectively. Characterization of the putative SlSULTR proteins included transmembrane topology prediction using the SCAMPI2 server and motif analysis using MEME Suite v5.5.7. De novo motif discovery using the MEME algorithm produced 10 amino acid motifs with E-values under 1E-164. These de novo motifs were scanned against Ensembl’s A. thaliana protein database using the MAST algorithm which returned 27 A. thaliana transcripts, each from an AtSULTR gene and with highly significant motif similarities. To characterize the regulation of the putative SlSULTR genes, we searched for SlSULTR-targeted miRNAs in the psRNATarget database as well as identified cis-regulatory motifs in the 1000 bp upstream region of each genomic sequence through the PlantCARE server. Predicted miRNA were from various miRNA families known for their responses to biotic and abiotic stresses and their regulation of nutrient uptake and distribution, plant development, disease resistance, and signal transduction. Lastly, the identified cis-regulatory motifs were largely associated with plant light response but also included motifs associated with general stress and hormone signal response. This work represents the first genomic mining study of tomato SULTR genes. Our phylogenetic and amino acid motif results provide strong evidence that the selected sequences operate as SULTR genes in tomatoes, and the identified miRNA targets and cis-regulatory sequences reflect established research demonstrating the role of S in plant stress response.
Speakers Co-authors
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Plant Biotechnology
  • Poster # csv
  • Funding Source Specialty Crop Multi-State Program

1:00pm CDT

PBIG - Investigation of genotype-dependent in vitro shoot regeneration in highbush blueberry
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Agrobacterium-mediated transformation is widely used in plant genetic engineering. This method involves both Agrobacterium infection and plant regeneration. In this context, establishing an efficient plant regeneration system is a critical prerequisite for genetic engineering in plants. This study aims to identify highbush blueberry (Vaccinium corymbosum L.) cultivars suitable for genetic transformation. Furthermore, we seek to elucidate the molecular and genetic factors that determine genotype-dependent shoot regeneration capacity by utilizing the diverse genetic background in highbush blueberries. Additionally, this study explores cultivar-specific differences in Agrobacterium susceptibility, which remain unexplored in highbush blueberries. Regeneration from leaf explants of 15 highbush blueberry cultivars was investigated on media containing 1.0 mg/L TDZ or 1.0 mg/L TDZ and 0.5 mg/L NAA. There was considerable variation in callus formation and regeneration rates, the number of regenerated shoots, the time required for regeneration, indicating that regeneration in highbush blueberry is highly genotype-dependent. The regeneration rate was high (>75%) in ‘Blue Muffin’, ‘Legacy’, ‘Gulfcoast’ and ‘Georgiagem’. However, ‘Georgiagem’ required three additional weeks for shoot regeneration from the time of meristem formation compared to the other three high regeneration cultivars. All four northern highbush cultivars exhibited low regeneration rates (
Speakers
AT

Arisa Tsuyama

Kyoto university
Co-authors
MO

Masafumi Omori

Kyoto University
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB

1:00pm CDT

PBIG - The genome-wide identification and expression analysis of protein phosphatase 2C (PP2C) genes in sweet potato (Ipomoea b
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Protein phosphatases, particularly PP2C families, are vital regulators of cellular activity through the removal of phosphate groups from proteins. Numerous biological processes, such as hormone signaling, reactions to heat and drought stress, and abiotic stress tolerance, are impacted by this dephosphorylation process. This study presents comprehensive genomic analysis, evolutionary assessment and transcript profiling of the PP2C gene family in sweet potato, a crop of major agricultural and nutritional importance. A total of 74 PP2C genes have been identified in sweet potato. Among them, 7 gene pairs were identified as segmental duplication while 5 pairs as tandem duplications. Phylogenetic analysis grouped them into distinct clusters, indicating potential functional divergence. Gene structure analysis provided insights into the arrangement of coding and non-coding regions. Motif and domain analysis highlighted conserved protein sequences aiding functional predictions. Synteny analysis compared genomic regions across species identifying homologous genes and tracing genome evolution. The study of cis-regulatory elements in promoters helped map gene regulations. Gene expression analysis is currently being conducted to determine the transcript levels of PP2C during salinity and drought stress. The results provide a basis for additional validation of the roles of the PP2C gene in sweet potatoes and advance our knowledge of the evolutionary background and functional significance of PP2C in biotic and abiotic stress response.
Speakers
MA

Muhammad Azad

University of Arkansas at Pine Bluff
Co-authors
AG

Ajit Ghosh

Shahjalal University of Science and Technology
NA
MA

Md. Afser Rabbi

Shahjalal University of Science and Technology
NA
SI

Shahidul Islam

University of Arkansas at Pine Bluff
NA
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Plant Biotechnology

1:00pm CDT

PH 1 - Alternative Oxidase Interacts with SNF1 Kinase to Modulate Energy Metabolism During Pear Fruit Ripening
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Alternative Oxidase Interacts with SNF1 Kinase to Modulate Energy Metabolism During Pear Fruit Ripening Adwaita Prasad Parida and Amit Dhingra1 Correspondence: Amit Dhingra, Professor, Department of horticultural sciences, A
Speakers Co-authors
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Postharvest 1
  • Subject Postharvest
  • Funding Source Texas A&M University and Texas A&M AgriLife Startup Funding to the Dhingra Genomics and Biotechnology Lab

1:00pm CDT

PH 1 - Effect of Atmospheric Modification on the Postharvest Shelf-Life of Pawpaw (Asimina triloba)
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Pawpaw (Asimina triloba), a North American tree fruit, belongs to the Annonaceae family and is the only temperate member of this family. Pawpaw is emerging as an alternative high-value niche crop for small farms in Kentucky and surrounding states; however, due to its highly perishable nature, the marketing window for fresh fruit is currently limited. Pawpaw fruit can only be stored for 3-5 days at room temperature or for about 1 month under cold storage at 4 °C. The objective of this study was to examine the efficiency of modified atmosphere with plastic packaging in cold storage to increase the shelf-life of pawpaw fruit and its impact on the quality attributes of fruit. This experiment was conducted with fruit from the pawpaw cultivar Sunflower. Fruits were harvested and stored in three treatments of modified atmosphere in 2.5-gallon plastic container bags, with the treatments of 1) plastic bag with ambient air (Control), 2) plastic bag with an additional ethylene absorber, and 3) plastic bag with modified atmosphere of low oxygen and high carbon dioxide gas mix (12% O2 and 10% CO2 and balance nitrogen). There were three replicate bags per treatment with each bag containing three fruits. Fruits were stored at 6 °C. Data on gas composition in bags and quality parameters of fruit such as firmness, brix, color (L*, a*, b*), and weight were taken on 5, 10, 20, 40, and 80 days of storage. The ethylene absorber and gas mix treatments maintained lower ethylene concentrations inside the bags as compared to the control. The gas mix treatment resulted in reduced fruit weight loss and maintained the lightness of fruit pulp significantly. However, firmness in all fruits significantly declined after 20 days of storage in all treatments. These data suggest that the ethylene absorber and gas mix treatments during cold storage have at least some potential for extending shelf-life of pawpaw, with additional modifications or harvest times.
Speakers
KS

Kshitij Shahi

Kentucky State University
Co-authors
BA

Brent Arnoldussen

University of Kentucky
NA
JL

Jeremy Lowe

Kentucky State University
KP

Kirk Pomper

Kentucky State University
Dr. Kirk W. Pomper is the Professor of Horticulture in the College of Agriculture, Community, and the Sciences at Kentucky State University in Frankfort, Kentucky. As Horticulture Research Leader, his program is focused on research and Extension efforts toward developing pawpaw as... Read More →
SC

Sheri Crabtree

Kentucky State University
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Postharvest 1
  • Subject Postharvest
  • Funding Source USDA Evans Allen Grant Number KYX--10-17- 63P

1:00pm CDT

PH 1 - Investigations of apple lenticel breakdown and other superficial disorders
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Several apple cultivars are susceptible to lenticel breakdown including but not limited to ‘Honeycrisp’, ‘Red Delicious’, ‘Gala’, and ‘SweeTango’. ‘Honeycrisp’ in particular has received considerable scrutiny by apple growers and packers due to its low percentage of packable fruit. ‘Honeycrisp’ in Michigan are put into storage with little to no disorders and, in 3-5 months, are pulled out of storage achieving less than 50% pack-outs of quality fruit in severe cases. These low pack-outs are a result of internal disorders, a physiological disorder ‘bitter pit’, lenticel breakdown, advanced decay, and some unknown light brown spotting that can be similar or smaller in size than lenticels. Investigations into the mechanisms behind these various ‘spots’ and discriminating between them is an essential first step in understanding the disorders and the discovery of solutions for growers and storage operators. In this study, three preliminary assessments were made to resolve the ambiguity behind lenticel breakdown and associated ‘spots’: 1) apple lenticels were imaged by light and scanning electron microscopy and characterized, 2) ‘Honeycrisp’ and ‘SweeTango’ apples were wrapped in paper and mesh bags on the tree as a field chemical spray exclusion assessment, and 3) a preliminary look at the microbiome of healthy and unhealthy lenticels. The latter effort revealed that ‘Alternaria’ species dominate the fungal community of unhealthy lenticels.
Speakers
AE

Alexander Engelsma

Michigan State University
Co-authors
EL

Emily Lavely

Michigan State University Extension
NA
NR

Nikki Rothwell

Michigan State University Extension
NA
NS

Nobuko Sugimoto

Michigan State University
OH

Ozge Horzum

Michigan State University
NA
RB

Randolph Beaudry

Michigan State University
Dr. Randolph Beaudry, Professor, MSU Department of Horticulture (MSc, PhD, University of Georgia). His appointment is 50% MSU Extension and 50% AgBioResearch. His research program includes both regional and international projects and focuses on the physiology of plant responses to... Read More →
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Postharvest 1
  • Subject Postharvest
  • Funding Source Michigan Apple Committee and Project GREEEN

1:00pm CDT

PH 1 - Physiological And Metabolic Responses Of Maturity Levels And Postharvest Treatments In Cold-stored Interspecific ‘Greens
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
The interspecific pear cultivar ‘Greensis’ has become a highly demanded pear cultivar due to its unique flavor of sweetness, crispness and juiciness. This study evaluated the postharvest storage quality of ‘Greensis’ pear at two maturity levels, treated with the 1 µL L-1 1-methylcyclopropene (1-MCP), pre-storage conditioning (PSC), and the combination treatment of 1-MCP and PSC before long term cold storage at 0.5 °C for 6 months. Both the incidence and severity of physiological disorders, such as cortex and core browning, were significantly reduced in PSC treatments, meanwhile, the severity levels of cavity were notably lower in treated fruit compared to untreated (control) fruit. Among the targeted metabolites, soluble carbohydrates and organic acids particularly, sucrose and shikimic acid were lower in mature fruit than immature fruit. Moreover, the contents of glucose, fructose, malic acid and shikimic acids were higher in PSC treated fruit than the other treatments especially in mature fruit. The branched-chain amino acids, including isoleucine and leucine, glutamic acid and phenylalanine, in all treatments were lower in immature fruit, meanwhile, methionine was higher in mature fruit. Additionally, in immature fruit, the contents of asparagine, serine, threonine and proline in the combination treatment of 1-MCP and PSC were higher than the other treatments. In addition, the phenolic contents of all treated fruit were higher in immature than mature fruit especially in chlorogenic acid, arbutin, caffeic, p-coumaric acid, and gallic acid after long term cold storage. Overall, these results suggested that the higher accumulation of phenolic compounds and specific amino acid contents in immature fruit play as a defense mechanism and enhances cold stress tolerance during long-term cold storage. Furthermore, PSC treatments effectively maintain the postharvest fruit quality by reducing the physiological disorders in cold stored ‘Greensis’ pear.
Speakers
TL

Theintthandar Latt

Chung Ang University
PhD candidate at Postharvest Physiology Laboratory, Chung-Ang University.
Co-authors
HP

Hyowon Park

Chung-Ang University
JL

Jinhee Lee

National Institute of Horticultural and Herbal Science
NA
JL

Jinwook Lee

Chung Ang University
NA
JP

Jiwon Park

Chung Ang University
NA
JJ

Joohyuk Jo

Chung Ang University
NA
SB

Si-Eun Byeon

Chung-Ang University
NA
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Postharvest 1

1:00pm CDT

PH 1 - Postharvest Handling and Shelf-Life Evaluation of Three Blackberry Cultivars Under Controlled Storage Conditions
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Blackberry berries are highly perishable fruits, requiring effective postharvest management to maintain quality during storage. This study investigates the shelf-life and postharvest physiology of three blackberry cultivars ‘Ponca’, ‘Freedom’, and ‘Osage’—stored at 0°C for 0 to 7 days and 5°C for 8 to 16 days. Key parameters measured include red drupelet reversion, leakiness, weight loss, acidity (citric, malic, tartaric acid), pH, Brix content, anthocyanin, and antioxidant content. Fresh blackberry fruits of three different cultivars were collected from a commercial garden and stored in 6 oz clamshell boxes under controlled conditions. Physiological parameters such as weight loss, red drupelet reversion, and leakiness were evaluated at 0, 7, 12, and 16 days of storage. For chemical analysis, an additional 6 oz clamshell box for every sample was stored at -40°C at 0, 7, 12, and 16 days to assess acidity, Brix content, anthocyanin, and antioxidant. Results indicate significant varietal differences in postharvest stability. ‘Freedom’ exhibited the highest red drupelet reversion and leakiness, with a steady decline in acidity over time, suggesting rapid deterioration. ‘Osage’ maintained the most stable postharvest quality, showing the lowest red drupelet reversion and highest acidity, which may contribute to improved storage potential. ‘Ponca’ demonstrated moderate stability but exhibited a sharp increase in leakiness and red drupelet reversion at later stages, indicating postharvest instability. Weight loss data revealed that ‘Freedom’ experienced the highest weight reduction, while ‘Ponca’ and ‘Osage’ exhibited greater stability over the storage period. Acidity levels varied significantly among cultivars, with ‘Osage’ retaining the greatest citric, malic, and tartaric acid concentrations, potentially enhancing shelf stability. ‘Freedom’ exhibited the lowest acidity, affecting taste and preservation. pH trends revealed that ‘Freedom’ lost acidity fastest, while ‘Ponca’ maintained stable acidity, making it more suitable for extended storage. These findings highlight the need for cultivar-specific postharvest strategies. While ‘Osage’ appears to have better natural postharvest qualities, ‘Ponca’ and ‘Freedom’ may require optimized storage conditions to minimize quality loss. This study provides valuable insights for improving blackberry storage, reducing postharvest losses, and extending marketability.
Speakers
NS

Nurjahan Sriti

University of Florida
Co-authors
GL

Guodong Liu

University of Florida
JW

Jeffrey Williamson

University of Florida
SS

Steven Sargent

University of Florida/IFAS
Professor and Extension Postharvest Specialist
ZD

Zhanao Deng

University of Florida
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Postharvest 1

1:00pm CDT

PH 1 - Preharvest Ethylene Regulators and their Impact on Postharvest Fruit Quality of ‘Honeycrisp’ Apples Grown in the Mid-Atl
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Reduced fruit quality throughout cold storage is a major stakeholder-identified factor limiting production and marketability of the profitable apple ‘Honeycrisp’ in the Mid-Atlantic. ‘Honeycrisp’ is known to be a chilling sensitive cultivar when cooled immediately after harvest, therefore fruits are submitted to a postharvest conditioning treatment (10ºC for 7 days) prior to cold storage (3ºC). However, conditioning exacerbates the expression of bitter pit, rendering the fruit unmarketable. Moreover, maturity at harvest is a critical factor affecting apple fruit quality as well as susceptibility to chilling stress. Ethylene, the primary hormone related to hastening fruit maturity, can be regulated via the use of preharvest ethylene regulators. We aimed to characterize and compare the effects of different preharvest ethylene regulators on ‘Honeycrisp’ fruit maturity, quality and chilling sensitivity during postharvest. Three preharvest ethylene regulators with different modes of action were applied based on manufacturer’s recommendations, including 1- methylcyclopropene (1-MCP, Harvista), aminoethoxyvinylglycine (AVG, Retain), Ethephon (Ethrel) and a control. Fruits were harvested at two maturity stages: at the anticipated commercial harvest (CH) and one week after CH (CH 1). After harvest, in each case, fruit were submitted to conditioning (10ºC for 7 days) and then stored at 3ºC. Fruit from all 8 treatments were evaluated at harvest, and after 8, 16 and 24 weeks of storage at 3ºC, followed by a shelf-life period (7 days at 20ºC). Our results show that preharvest ethylene regulator treatments impacted fruit maturity and quality of ‘Honeycrisp’ apples during storage. Ethylene production was reduced in 1-MCP and AVG treated fruit, with the latter showing the lowest values throughout storage during both harvest dates. Concurrently, 1-MCP and AVG treated fruits displayed a higher flesh firmness as well as a greener background color (as indicated by higher IAD values) compared to Ethephon- treated and control fruit. Skin blush was negatively affected by 1-MCP and AVG applications, which were maintained throughout postharvest, with AVG-treated fruit exhibiting the significantly lower values. Effects on starch pattern indices and soluble solids contents were inconsistent. Chilling sensitivity, through the presence of soft scald, was not observed, but 1-MCP treated fruit presented the highest bitter pit incidence, followed by AVG-treated fruit, while Ethephon and control fruit displayed the lowest. This study contributes to understand how preharvest ethylene modulation influences ‘Honeycrisp’ apple maturity and quality throughout storage.
Speakers
MS

Md Shipon Miah

University of Maryland - College Park
Co-authors
MF

Macarena Farcuh

University of Maryland
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Postharvest 1
  • Subject Postharvest
  • Funding Source USDA NIFA AFRI GRANT13712074

1:00pm CDT

PH 1 - Red Drupelet Reversion and Consumer Preference of Four Blackberry Cultivars Grown in Georgia
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Blackberry (Rubus spp.) production in Georgia is valued at $19.9 million annually with approximately 1,900 planted acres, mostly concentrated in the southern part of the state. Blackberries have been increasingly planted in Georgia as a dynamic alternative crop that can diversify and support blueberry growers’ income. The harvest season is short, starting in mid-May and ending mid-July. The planted genotypes are mainly from other Southeastern breeding programs often with little to no testing on their suitability for the local growing conditions. Four University of Arkansas-bred cultivars – ‘Caddo,’ ‘Osage,’ ‘Ouachita,’ and ‘Ponca,’ were selected with a goal to identify the most appropriate cultivar for production in Georgia climatic conditions. Blackberries were hand-harvested, field-packed, placed in cold storage for up to 21 days, and evaluated over a two-year harvest period from a commercial field in Holt, GA (31.5957˚N, 83.1507˚W). Red Drupelet Reversion (RDR) is a major postharvest disorder where fully ripe, black drupelets revert to red color after harvest. Assessments for RDR incidence were conducted immediately after harvest and every seven days, along with measurements of berry physicochemical traits. Consumers' taste panels were conducted a day after harvest. A high incidence of RDR was quantified at harvest and after storage for ‘Ouachita,’ followed by ‘Ponca,’ ‘Caddo’ and ‘Osage.’ In addition, the panelists favored ‘Caddo’ blackberries, while ‘Ouachita’ was the least preferred cultivar. Appropriate preharvest and postharvest practices, in combination with timely, gentle harvests should be employed to decrease RDR incidence and maintain fruit quality.
Speakers
VF

Vinicius Fernandes Araujo

University of Georgia
Co-authors
AD

Angelos Deltsidis

University of Georgia
RC

Ramsey Corn

University of Georgia
ZR

Zilfina Rubio

University of Georgia
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Postharvest 1

1:00pm CDT

PH 1 - Sweetpotato Peel Nanoparticle Coatings Reduce Postharvest Deterioration
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Edible nanoparticle coating materials were developed from sweetpotato peel tissue combined with sodium alginate and tested for their efficacy in reducing sweetpotato and potato postharvest deterioration. The bio-based nanoparticle coatings applied as thin films to the surface of sweetpotato roots and potato tubers reduced postharvest weight loss and respiration rate. The sweetpotato peel-based nanoparticle coating formulations included 1% and 2% sodium alginate. To enhance the structural integrity of the coatings, they were cross-linked by immersion in a 1% calcium chloride solution. The crosslinked formulations significantly outperformed non-crosslinked coatings and uncoated samples by minimizing weight loss (to below 2.0%–4.0% versus 3.5%–6.5% in controls) and decreasing respiration rates (to 5-13 mL CO₂/kg·h versus 7-20 mL CO₂/kg·h in controls) over extended storage periods. The enhanced performance is attributed to the formation of a dense, mechanically robust coating matrix. Sweetpotato peel tissue nanoparticles combined with sodium alginate and crosslinked with calcium chloride offer promise as sustainable coating materials for reducing fresh produce postharvest deterioration
Speakers
RA

Ragab Abouzeid

Louisiana State University
Co-authors
DP

David Picha

Louisiana State University
QW

Qinglin Wu

Louisiana State University
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB

1:00pm CDT

PH 1 - The Difficulty of Degreening Florida Grapefruit with the “Greasy Green” Disorder
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Fresh grapefruit consumers are trained to expect vivid yellow-orange peel color, depending on the variety, even though peel color has little to do with internal maturity or quality. The greasy spot rind blotch disease has been in Florida for many years, ascribed to a fungal pathogen called Zasmidium citri-griseum (previously named Mycosphaerella citri). Besides causing defoliation, it also mars the peel with tiny black specks that cause the rind to remain green, even after degreening. The spots can coalesce into black patches in extreme cases, sometimes called “pink pitting” or greasy spot rind blotch. Growers had this disease under good management, but within the past five years, fruit with similar symptoms started appearing as early as November, when nighttime temperatures are low, and peel color should improve instead of regreening. The symptoms are like greasy spot rind blotch, but there are few to no symptoms on the leaves of the same trees. Thus, the industry generally refers to the disorder as “greasy green” until a more definitive identification of the causal agent and disease development is determined. In a 2021 grower survey, 89% of respondents experienced the disorder to some extent, with packers reporting losses ranging between $20,000 and $1.7 million. There was no consensus among growers and packers regarding the cause of greasy green or the factors contributing to the problem. While studies are underway to determine if the disorder is indeed related to greasy spot rind blotch, studies were initiated to determine if affected fruit could be degreened effectively, as many packers often ended up abandoning degreening attempts on affected fruit and not using them for the fresh market. Our tests found that even after degreening (5 ppm ethylene at 27oC) red and white grapefruit for up to 5 days, their peel color still was not acceptable (
Speakers
MR

Mark Ritenour

University of Florida - Indian River REC
NA
Co-authors
CH

Cuifeng Hu

University of Florida
NA
EM

Eva Mulandesa

University of Florida
NA
LC

Liliana Cano

University of Florida
NA
MD

Megan Dewdney

University of Florida
NA
MM

Monty Myers

University of Florida
NA
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Postharvest 1
  • Subject Postharvest
  • Funding Source Citrus Research and Development Foundation, Inc.

1:00pm CDT

PLAST - Evaluation of Mulch Types on Soil Microclimate and Health for Tomato and Lettuce Production in the Central United States
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Maintaining soil health for open field and high tunnel (HT) production of vegetables has become prioritized by growers in recent years. In particular, there have been growing concerns about the sustainability of HT systems. Their hot and dry conditions, compounded by intensive practices, lead to challenges with soil temperature and moisture management, compaction, salinity, and ecosystem health. This report investigates how established and novel mulch types can help growers manage soil temperature, moisture, and health conditions across growing systems and climatic conditions. Tomato and lettuce trials were conducted from 2022 to 2024 in HTs and open-field plots to determine the effect of various mulch treatments (bareground, black plastic film, black woven fabric, paper mulch, white silage tarp and black silage tarp) on soil temperature, moisture, and health. Gravimetric and volumetric soil moisture content were determined weekly and bi-weekly in the lettuce and tomato trials, respectively. Soil temperatures were recorded at 10.2 cm depth throughout the growing seasons for both crops. EC, bulk density, and respiration data were collected at termination of all trials to assess soil health. In tomato, the application of black plastic mulch, fabric mulch, and black silage tarp was associated with higher average soil temperatures (23.7°C-28.9°C), compared to (22.4°C-26.8°C) under white tarp and paper mulch. In the lettuce trials, all mulch types retained soil heat in the early season (0.7°C-2.2°C) compared to bareground. The use of silage tarp maintained up to 21% more soil moisture than the bareground treatment for tomato and all mulches were effective at managing moisture loss. Limited effects on soil health criteria were observed, though higher measurements of bulk density and EC may be associated with increases in soil moisture. Results indicdate that mulch color and material affect soil temperatures and soil moisture in the summer, whereas in fall all mulches may reduce heat loss in the early period of the growing season and soil moisture (5-7%) in the late season. As growers address soil health concerns, an integrated approach will need to be adopted that utilizes multiple practices. This study shows that mulch color and type/material can be selected to alter the microclimate of the soil environment across production systems. More research is needed to determine how these impacts affect long-term soil health. The development of regional growing practices that ensure soil health will be instrumental to support a growing population and using mulches for vegetable production can help achieve this goal.
Speakers
CB

Claire Barnhart

Kansas State University
Co-authors
CR

Cary Rivard

Kansas State University
EP

Eleni Pliakoni

Kansas State University
PT

Peter Tomlinson

Kansas State University
NA
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Plasticulture
  • Subject Plasticulture
  • Poster # csv
  • Funding Source K-State Research and Extension Center for Sustainable Agriculture and Alternative Crops 2023 and Kansas State University GRIP Project

1:00pm CDT

PLAST - Evaluation of Soil Biodegradable Mulches used in Plasticulture System Under Different Climatic Regions of North Carolina
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Evaluation of Soil Biodegradable Mulches used in Plasticulture System Under Different Climatic Regions of North Carolina With Tomato as A Model Crop E. Atley, G. Yang, and T. McGee, Department of Natural Resources and Environmental Design, North Carolina A
Speakers
EA

Elijah Atley

North Carolina A
NA
Co-authors
GY

Guochen Yang

North Carolina A
TM

Trequan McGee

North Carolina A
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Plasticulture
  • Subject Plasticulture
  • Poster # csv
  • Funding Source USDA-NIFA-CBGP-011395

1:00pm CDT

PLAST - Microplastics In Agriculture, A Silent Threat To Ecosystem: Why Biodegradable Pots Are The Future Of Agriculture?
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
The widespread use of plastics in agriculture (plasticulture), including greenhouse films, plastic mulches, plastic pots, seedling trays, pesticide containers and drip irrigation systems, although contributing to short-term productivity, has long-term detrimental consequences for the ecosystem and human health. The accumulation of plastics in soil, chemical leaching from plastics and their degradation into microplastics (particles smaller than 5 mm) is one of the most serious environmental challenges, affecting soil fertility, plant health, and the human food chain. Micro- and nanoplastics and the additives used to enhance the performance and appearance of these plastics can potentially damage tissues and cellular systems by activating various chains of tissue function. Thus, various types of micro- and nanoplastics lead to inflammation, cytotoxicity, genotoxicity and immunotoxicity in cells and tissues. Reproduction is particularly affected by these pollutants, as many of these pollutants can cause endocrine disruption. Efforts to mitigate the negative impacts of plastics include recycling plastic waste, developing biodegradable alternatives, and improving waste management practices. In this regard, Behzist Danesh Narvan Company has used modern technology to produce biodegradable pots (Lignum Vitae) made from completely natural materials such as plant fibers and bio-based adhesive. These flower pots have many advantages as being breathable, 100% biodegradable and ecofriendly, rapid decomposition, having high percentage of organic matter, compatibility with different climates and reducing plastic pollution. These pots can act as a natural fertilizer and enhances plant growth after decomposition.
Speakers
HH

hanieh Hadizadeh

Behzist danesh Narvan Co
I held a Ph.D. in Physiology and Breeding of Ornamental Plants, followed by three years of postdoctoral research at Ferdowsi University of Mashhad, Iran. I also passed one year internship at the University of Georgia, USA. My abstract entitled “Genetic Diversity of a Germplasm Collection... Read More →
Co-authors
NM

Nezhat Mousavi Far

Armaghan surgery center
NA
Wednesday July 30, 2025 1:00pm - 1:45pm CDT
Empire AB
  Poster, Plasticulture

1:30pm CDT

Coffee Break
Wednesday July 30, 2025 1:30pm - 2:00pm CDT
Wednesday July 30, 2025 1:30pm - 2:00pm CDT
Empire AB

6:00pm CDT

Graduate Student Poster Competition
Wednesday July 30, 2025 6:00pm - 7:00pm CDT
The student must stand in front of the physical poster during the competition hours and the judges will walk around to each contestant. The student will be given 5 minutes to make a presentation to the judges, followed by a 2 minute period of questions and answers. There is no virtual presentation option.
Please note: Signing up for the competition means that you are agreeing to present twice – once for your regularly scheduled poster session and once in the competition.  If you do not also present your poster during the regularly scheduled Conference Poster session program, you will be disqualified from the Poster Competition, and your abstract will not be published in the on-line supplement of HortScience.
Competition winners in each graduate level program (MS and PhD) will each receive monetary prizes ($300 first; $200 second; $100 third) and the winners' names and abstracts will be posted to the ASHS web site and highlighted in the ASHS E-News.
The winners are announced at the Awards and Trivia Night on Thursday, July 31 at 6:00 pm during the conference.

Wednesday July 30, 2025 6:00pm - 7:00pm CDT
Empire AB
 


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