Organizing Committee


Poster Presentations

Poster Presentations


Sources of Chinese soybean rust resistance evaluated with Mississippi isolates of Phakopsora pachyrhizi

Presenter: S. Li

All authors and affiliations: S. LI (1), D. Wang (2). (1) USDA ARS CGRU, Stoneville, MS; (2) Department of Crop & Soil Sciences, Michigan State University, MI

Soybean rust, caused by Phakopsora pachyrhizi Sydow, is one of the most destructive diseases of soybean (Glycine max (L.) Merr.). Since the first discovery of soybean rust in the continental United States in 2004, significant efforts have been made to evaluate soybean lines using U.S. isolates to identify new resistance sources. In this study, 22 Chinese lines previously identified as resistant in China, four plant introductions with known single genes for resistance to P. pachyrhizi, and Williams 82 as a susceptible check were evaluated using a bulk culture of P. pachyrhizi isolates collected from Mississippi. Replicated experiments were conducted in a growth chamber at the Stoneville Research Quarantine Facility in 2008 and 2009. Of the 22 Chinese lines tested, 10 had the reddish brown (RB) reaction. Soybean line CN3 was identified as the most resistant line. It had the red-brown reaction with the lowest severity and sporulation rating. Further evaluation using other U.S. isolates is in progress. Soybean lines having resistant reactions to both U.S. and Chinese isolates may serve as resistant sources for developing elite cultivars with broad resistance to soybean rust.

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