# Identification of QTLs Associated with Resistance to Riptortus clavatus Thunberg (Heteroptera: Alydidae) in Soybean (Glycine max L. Merr.)

• Li, Wenxin (Department of Plant Science and Research Institute for Agriculture and Life Sciences, Seoul National University) ;
• Van, Kyujung (Department of Plant Science and Research Institute for Agriculture and Life Sciences, Seoul National University) ;
• Zheng, Da-Hao (Department of Plant Science and Research Institute for Agriculture and Life Sciences, Seoul National University) ;
• Liu, Weixian (Department of Plant Science and Research Institute for Agriculture and Life Sciences, Seoul National University) ;
• Lee, Yeong-Ho (Department of Plant Science and Research Institute for Agriculture and Life Sciences, Seoul National University) ;
• Lee, Sue-Yeon (Department of Agricultural Biotechnology and Research Institute for Agriculture and Life Sciences, Seoul National University) ;
• Lee, Joon-Ho (Department of Agricultural Biotechnology and Research Institute for Agriculture and Life Sciences, Seoul National University) ;
• Lee, Suk-Ha (Department of Plant Science and Research Institute for Agriculture and Life Sciences, Seoul National University)
• Published : 2008.12.31

#### Abstract

The bean bug Riptortus clavatus Thunberg (Heteroptera: Alydidae) is an important pest, causing serious yield loss in soybean. But the information on mechanism of resistance to R. clavatus is limited. The objective of this study was to identify QTLs for R. clavatus resistance using simple sequence repeat (SSR) markers in a soybean population of recombinant inbred lines (RILs) developed from the cross PI 171451 ${\times}$ Hwaeomputkong. A genetic map from this population was constructed with a total of 136 SSR markers covering 1073.9 cM on 20 linkage groups (LGs). With 126 $F_5$ RILs, two independent QTLs for resistance to R. clavatus were mapped on LGs B1 and C2. The amount of phenotypic variation explained by these QTLs ranged from 12 to 16%. PI 171451 showed an escape response to R. clavatus. Under feeding conditions, 14.4% of RILs showed greater resistance to R. clavatus than the resistant parent. The resistance to R. clavatus in soybean from PI 171451 was incomplete and quantitatively inherited and the QTLs for resistance to R. clavatus detected in the RIL population were not significantly affected by epistatic interactions.