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46

Screening soybean germ plasm for field resistance to soybean rust

Presenter: D. Wang

All authors and affiliations: D. WANG (1), H. Chen (2), Y. Luo (3), S. Wang (4), R. Hammerschmidt (1), and R. Boerma (5). (1) Michigan State University, East Lansing, MI; (2) Jiangsu Academy of Agricultural Sciences, Nanjing, China; (3) Sanming Institute of Agricultural Sciences, Sanming, China; (4) Jilin Academy of Agricultural Sciences, Changchun, China; and (5) University of Georgia, Athens, GA

Soybean rust can reduce soybean yield by up to 80%. There are very limited known sources of resistance to the disease. The objective of this research was to identify sources of field resistance to soybean rust in early-maturing Chinese soybean germ plasm. More than 2,700 accessions of Chinese soybean germ plasm with maturities II and earlier were evaluated for resistance to soybean rust in the field at two locations, Sanming and Nanjing, in China between 2004 and 2006. Each accession was planted in single 1-m row plots with two replications at each location. Soybean plants in Nanjing were inoculated several times during the V3, R1, and R2 stages with urediniospores of Phakopsora pachyrhizi. The plants in Sanming were evaluated under high natural disease pressure. Nineteen accessions showed resistance in both locations in 2004 and four of these accessions remained resistant in both locations in 2005. These 19 accessions were also tested in the greenhouse in Georgia for rust resistance. One of these accessions, GD0518, showed resistance in the greenhouse test. GD0518 was also among the four accessions that showed resistance in both 2004 and 2005 at the two locations in China. In 2005, 31 additional accessions showed resistance in China at both locations. These 31 accessions were reevaluated in 2006 in China at two locations and in Georgia at one location.

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