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ARS Home » Midwest Area » West Lafayette, Indiana » Crop Production and Pest Control Research » Research » Publications at this Location » Publication #404162
Research Project: Genetic Enhancement of Seed Quality and Plant Health Traits, and Designing Soybeans with Improved Functionality

Location: Crop Production and Pest Control Research

Title: Identification and characterization of resistance and susceptibility sources to Fusarium graminearum in soybean

Author
item DETRANALTES, CHRISTOPHER - Purdue University
item MA, JIANXIN - Purdue University
item Cai, Guohong

Submitted to: American Phytopathological Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 4/15/2023
Publication Date: 8/12/2023
Citation: Detranaltes, C., Ma, J., Cai, G. 2023. Identification and characterization of resistance and susceptibility sources to Fusarium graminearum in soybean. American Phytopathological Society Abstracts. ABSTRACT.

Interpretive Summary: N/A

Technical Abstract: Soilborne damping-off pathogens of soybean are the second leading cause of soybean yield loss in the United States after soybean cyst nematode. Fusarium graminearum was only recently recognized as an aggressive seed and seedling pathogen of soybean and genetic resistance is thus poorly reported. Understanding and improving durable resistance to this pathogen is an important target for reducing soybean losses. Over 200 varieties including a mixture of landraces and commercial lines were selected from the USDA soybean germplasm collection for resistance screening against Midwest-adapted isolates of Fusarium graminearum from Ohio and Indiana. Varieties scoring significantly higher on both emergence and adjusted root weight measures than the population mean were discovered through repeated greenhouse screenings. A continuous distribution of phenotypes was observed among the selected varieties indicating that resistance to this pathogen is likely polygenic. GWAS uncovered 5 significant marker trait associations (MTAs) each explaining 3-4% of the variation observed in both emergence and root weight after inoculation. The MTAs show primarily susceptibility with one resistance effect. Comparison to the published Williams82 reference genome show the susceptibility marker found on chromosome 6 lies in the middle of a GDSL-like lipase/acylhydrolase protein while that on chromosome 3 is roughly 5 kbp from an armadillo repeat kinesin. Two of the susceptibility MTAs on chromosome 7 and chromosome 13 are not within currently annotated regions of the genome. The minor resistance marker is located 741 bp away from an WSD1-like O-acyltransferase family protein.