Location: Crop Genetics ResearchTitle: Evaluation of Selected Genotypes of Soybean for Resistance to Phakopsora pachyrhizi Author
Submitted to: Plant Health Progress
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/25/2009
Publication Date: 6/15/2009
Citation: Li, S., Young, L.D. 2009. Evaluation of Selected Genotypes of Soybean for Resistance to Phakopsora pachyrhizi. Plant Health Progress. doi:1094/PHP-2009-0615-01-RS Interpretive Summary: Soybean rust is caused by a fungus (mold) and is one of the most destructive diseases of soybean. In this study, 33 selected genotypes of soybean were evaluated for resistance to soybean rust using a bulk population of rust spores collected in Mississippi. PI567102B was identified as one of the most resistant lines. In addition, four additional soybean lines had a type of resistance while four soybean lines had susceptible reactions but the amount of disease was less than most susceptible cultivars. These resistant soybean germplasm accessions can be used to develop soybean varieties that will resist the disease in the U.S.
Technical Abstract: Soybean rust, caused by Phakopsora pachyrhizi Syd. & P. Syd., is one of the most destructive diseases of soybean (Glycine max (L.) Merr.) worldwide. To identify sources of resistance to domestic soybean rust isolates, our strategy has been evaluate soybean lines that were previously identified as resistant to foreign isolates. In this study, two sets of plant introductions (PI) were evaluated using a bulk population of P. pachyrhizi urediniospores collected in Mississippi in 2006. The first set of PIs contained 10 lines previously identified as resistant in Paraguay and four PIs with known single genes for resistance to P. pachyrhizi. The second set had 17 lines that were selected based on information from Germplasm Resources Information Network (GRIN). Soybean cv. Williams 82 and Freedom were used as susceptible checks. Replicated experiments were conducted in growth chambers at the Stoneville Research Quarantine Facility from 2006 to 2008. Four soybean lines had red-brown resistant reactions to soybean rust. PI567102B was identified as one of the most resistant lines.