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Population-specific QTLs and their different epistatic interactions for pod dehiscence in soybean [<Emphasis Type="Italic">Glycine max</Emphasis> (L.) Merr.]
Authors:Sung-Taeg Kang  Myounghai Kwak  Hyeun-Kyeung Kim  Myoung-Gun Choung  Won-Young Han  In-Youl Baek  Moon Young Kim  Kyujung Van  Suk-Ha Lee
Institution:(1) National Institute of Crop Science, RDA, 151 Seodun-dong, Suwon, 441-857, South Korea;(2) Department of Plant Science and Research Institute for Agriculture and Life Sciences, Seoul National University, San 56-1, Shillim-dong, Kwanak-gu, Seoul, 151-921, South Korea;(3) School of Resources and Life Science, Pusan National University, Milyang, 627-706, South Korea;(4) Department of Herbal Medicine Resource, Kangwon National University, Samcheok, 245-711, South Korea;(5) Yeongnam Agricultural Research Institute, NICS, RDA, Milyang, 627-130, South Korea;(6) Plant Genomics and Breeding Institute, Seoul National University, Seoul, 151-921, South Korea;
Abstract:Pod dehiscence (PD) prior to harvest results in serious yield loss in soybean. Two linkage maps with simple sequence repeat (SSR) markers were independently constructed using recombinant inbred lines (RILs) developed from Keunolkong (pod-dehiscent) × Sinpaldalkong (pod-indehiscent) and Keunolkong × Iksan 10 (pod-indehiscent). These soybean RIL populations were used to identify quantitative trait loci (QTLs) conditioning resistance to PD. While a single major QTL on linkage group (LG) J explained 46% of phenotypic variation in PD in the Keunolkong × Sinpaldalkong population with four minor QTLs, three minor QTLs were identified in the Keunolkong × Iksan 10 population. Although these two populations share the pod dehiscent parent, no common QTL has been identified. In addition, epistatic interactions among three marker loci partially explained phenotypic variation in PD in both populations. The result of this study indicates that different breeding strategies will be required for PD depending on genetic background.
Keywords:Pod dehiscence  QTL  Epistatic interaction  Simple sequence repeat  Genetic linkage map  Recombinant inbred line
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