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ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #433317
Research Project: Breeding Stress Tolerant Soybeans, Regeneration and Evaluation of USDA Germplasm Collection,and Management of Uniform Soybean Trials

Location: Crop Genetics Research

Title: Development, release, and utilization of improved soybean lines with resistance to Phomopsis seed decay of soybean

Author
item Li, Shuxian
item Smith, James

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 5/14/2026
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Phomopsis seed decay (PSD) causes poor seed quality and is one of the most economically important seed diseases of soybean (Glycine max) worldwide impacting soybean production and farmer profits. Diaporthe longicolla (syn. Phomopsis longicolla) and another Diaporthe spp. are the cause of PSD. Developing, releasing and utilizing PSD-resistant cultivars is an economical and environmentally friendly strategy to protect soybean from disease-induced seed damage. Multiple exotic soybean accessions from the USDA soybean germplasm collection were field screened for more than a decade for reaction to PSD at Stoneville, Mississippi. To identify resistant lines, seed plating assays were conducted to evaluate infection levels of soybean seed harvested from field experiments with inoculation of D. longicolla. Improved germplasm lines with low seed infection by Diaporthe spp. were identified, developed, and publicly released by USDA. They are available in the Germplasm Resources Information Network (GRIN, https://npgsweb.ars-grin.gov/gringlobal/search). Released germplasm lines DS25-1 (PI 684675), DS31-243 (PI 700941), DS49-142 (PI 703498), and DS1260-2 (PI 705148) have all been requested by and transferred to public researchers/breeders. Additionally, DS25-1 and DS1260-2 were requested by and transferred to multiple private researchers/breeders. This research provides useful information and genetic materials for the development of durable resistance to PSD, which will aid in the management of soybean seed decay and reduce yield losses caused by the PSD disease. This research supports the Secretary of Agriculture's priority to Increase Profitability of Farmers by reducing the dockage they pay at the grain terminal due to poor quality seed.