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ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #314923
Title: An update of research on Phomopsis Seed Decay in soybean

Author
item Li, Shuxian
item RUPE, JOHN - University Of Arkansas
item CHEN, PENGYIN - University Of Arkansas
item SHANNON, GROVER - University Of Missouri
item SCIUMBATO, GABE - Mississippi State University

Submitted to: Southern Soybean Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 3/5/2015
Publication Date: 3/11/2015
Citation: Li, S., Rupe, J., Chen, P., Shannon, G., Sciumbato, G. 2015. An update of research on Phomopsis Seed Decay in soybean. Southern Soybean Conference Proceedings. Southern Disease Workers, 42th Annual Meeting, Pensacola Beach, Florida, March 11-12, 2015.

Interpretive Summary:

Technical Abstract: Phomopsis seed decay (PSD) is one of the most important soybean diseases that causes poor seed quality and further poor germination/vigor in most soybean production areas, especially in southern states. Very few soybean cultivars currently available for planting have resistance to PSD. To identify new sources of resistance to PSD, a multistate and multiyear research project on “Screening germplasm and breeding for resistance to Phomopsis seed decay” was funded by the United Soybean Board from 2009 to 2014. A total of 135 germplasm lines collected from 28 countries were field screened in Arkansas, Mississippi, and Missouri. Fifteen accessions (six MG III, four MG IV, and five MG V) had significantly (P = 0.05) lower Phomopsis seed infection than the susceptible checks across years and locations. Another study funded by the Mississippi Soybean Promotion Board, evaluated commercial cultivars for resistance to PSD with inoculated and non-inoculated treatments and two harvest times (on-time vs. delayed). Several cultivars were identified with low disease incidence and good seed quality. Our current research is focused on development of high-yielding soybean lines with PSD resistance. Over 20 new breeding populations have been developed to incorporate resistance genes into high yielding cultivars or breeding lines, including four mapping populations to identify and map the PSD resistance genes. Analysis of these populations will help us develop high yielding lines with PSD resistance and understand the genetics of PSD resistance. In addition, the genomes of four isolates of Phomopsis longicolla that cause PSD have been sequenced. The genome sequences of the pathogen will be valuable for investigating the genetic base of fungal virulence factors and understanding the mechanism of infection.