Monday, November 13, 2006
59-14
Resistance to Soybean Rust in Early Maturing Chinese Soybean Germplasm.
Dechun Wang1, Huaigu Chen2, Ying Luo3, Shuming Wang4, Ray Hammerschmidt1, and Roger Boerma5. (1) Michigan State Univ, A384-E Plant & Soil Bldg, East Lansing, MI 48824-1325, (2) Jiangsu Academy of Agricultual Sciences, 50 Zhong Lin St, Xiaolingwei, Nanjing, China, (3) Sanming Institute of Agricultural Sciences, Sanming, China, (4) Jilin Academy of Agricultural Sciences, Changchun, China, (5) Univ of Georgia, 202 Center for Applied Genetic Technologies, 111 Riverbend Rd, Athens, GA 30605
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 germplasm. Over 2,700 accessions of Chinese soybean germplasm 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 one-meter row plots with two replications at each location. Soybean plants in Nanjing were inoculated several times during 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 are being tested again in 2006 in China at both locations and in Georgia at one location.