Submitted to: American Phytopathological Society Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: March 6, 2008
Publication Date: July 26, 2008
Citation: Li, S., Young, L.D. 2008. Evaluation of Selected Soybean Genotypes for Resistance to Phakopsora pachyrhizi. Phytopathological. 98:589 Technical Abstract: Asian soybean rust (ASR), caused by Phakopsora pachyrhizi Syd. and P. Syd., is one of the most destructive diseases of soybean (Glycine max (L.) Merr.). ASR has been discovered in United States and has the potential to causes significant yield losses and major economic damage to U.S soybean production. Breeding for resistance to soybean rust is one of the most effective long-term strategies for controlling ASR. To identify new sources of resistance to domestic ASR isolates, our strategy is to evaluate soybean lines that were previously identified as resistant with foreign isolates. In this study, two sets of plant introductions (PI) were evaluated using an ASR isolate from Mississippi. The first set of PIs contained 10 lines previously identified as resistant in Paraguay and the second set had 17 lines that were selected based on information from Germplasm Resources Information Network (GRIN). Replicated experiments were conducted in growth chambers at the Stoneville Research Quarantine Facility from 2007 to 2008. Soybean line PI567102B was identified as the most resistant line. It had the lowest severity, no sporulation, and the red-brown reaction. Collaborative research is underway to evaluate a segregating population with PI567102B as a parent. Soybean lines having resistant reactions to both U.S. and foreign isolates may be important for developing elite cultivars with broad resistance to ASR.