2024
Yield Limitations of Soybean Varieties Under Drought: Identifying and Overcoming Weaknesses by Team Drought via Breeding, Genomics, Phenomics and Physiology.
Contributor/Checkoff:
Category:
Sustainable Production
Keywords:
AgricultureCompositionGeneticsHigh oleicSustainability
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Ben Fallen, USDA/ARS-North Carolina State University
Co-Principal Investigators:
Project Code:
24-209-S-C-1-B
Contributing Organization (Checkoff):
Institution Funded:
$499,344
Brief Project Summary:
The main goal of this project is to ensure drought does not impact US soybean production by developing drought-resilient varieties. Development strategies include identification and incorporation of new genes for drought and ozone-tolerance, improved root architecture, water use efficiency and incorporation of value-added traits, i.e. high oleic and high protein.
Information And Results
Project Summary

Project Objectives

Project Deliverables

Progress Of Work

Final Project Results

Significant progress has been made in developing drought-tolerant soybean varieties and associated technologies, resulting in notable advancements for soybean production under water-limited conditions. Between 2022 and 2024, nine drought-tolerant varieties were released, offering farmers greater resilience and yield stability. Key genetic markers and genes have been identified, including three canopy wilting QTLs that explain a substantial portion of phenotypic variation in drought stress tolerance, two slow wilting genes, and a patented root gene that improves drought tolerance through gene editing. The integration of high-throughput platforms, such as drone-based canopy wilting scoring and root trait imaging, has streamlined the selection process for drought tolerance, while machine learning models for canopy wilting have further enhanced precision. Evaluations of new drought-tolerant lines in field trials revealed superior performance over commercial checks under both irrigated and dry conditions. In particular, high oleic, low linolenic (HOLL) lines, derived from slow wilting parents, have performed at or above commercial standards. These lines not only offer drought tolerance but also improved oil content, an important trait for marketability. Collaborative breeding efforts are continuing to advance elite lines and incorporate valuable traits such as herbicide tolerance, with new crosses already being developed for future releases. Additionally, evaluations of drought response mechanisms and genomic selection are nearing completion, which will provide further insights into drought-tolerant traits and enhance breeding strategies. Finally, promising developments in nutrient management, including a phosphorus-solubilizing inoculant combined with nitrogen-fixing capabilities, offer an additional layer of adaptability for soybean production in drought-prone regions. Collectively, these advancements not only improve drought tolerance but also increase productivity, sustainability, and market potential for soybean farmers facing the challenges of climate variability.

Benefit To Soybean Farmers

The release of nine drought-tolerant soybean varieties (MG IV-VII) between 2022 and 2024 offers substantial benefits to farmers, with varieties in MG II and III currently in development and are approaching release. These varieties, enhanced with advanced genetic traits such as canopy wilting QTLs and slow wilting genes, exhibit superior performance under both irrigated and drought conditions. Root gene discovery and drone-based canopy wilting scoring have accelerated the identification of key drought tolerance markers, while deep learning models have improved precision in evaluating drought stress. Farmers can expect higher yields and better crop resilience, from the varieties currently being developed. Additionally, high oleic, low linolenic (HOLL) lines and lines with improved oil content offer improved marketability. Enhanced breeding efforts, such as those incorporating drought response mechanisms and genomic selection, ensure continued improvements in both drought tolerance and yield, giving farmers access to cutting-edge varieties adapted to changing climate conditions.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.