Detection of epistatic interaction of two QTLs, gw8.1 and gw9.1, underlying grain weight using nearly isogenic lines in rice

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  • Jin Feng-Xue
    Department of Agronomy, College of Agriculture & Life Sciences, Chungnam National University Present address: Biotechnology Research Center, Jilin Academy of Agricultural Sciences
  • Ji Shi-Dong
    Department of Agronomy, College of Agriculture & Life Sciences, Chungnam National University
  • Xie Xiao-Bo
    Institute of Horticulture, Zhejiang Academy of Agricultural Sciences
  • Kang Ju-Won
    Department of Agronomy, College of Agriculture & Life Sciences, Chungnam National University
  • Ju Hong-Guang
    Agricultural Department, Agricultural College of Yanbian University
  • Ahn Sang-Nag
    Department of Agronomy, College of Agriculture & Life Sciences, Chungnam National University

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Grain weight (GW) is one of the most important targets for grain yield in rice breeding. In previous studies, two quantitative trait loci (QTLs) for GW, gw8.1 and gw9.1, have been identified using progeny derived from a cross between the japonica cultivar Hwaseong and Oryza rufipogon (IRGC 105491). To test whether these quantitative trait loci (QTLs) have an epistatic interaction, we developed an F2 population by crossing two nearly isogenic lines (NILs) harboring gw8.1 and gw9.1. Simple sequence repeat (SSR) markers tightly linked to the QTLs were used to select F3 QTL-NILs from the F2 population. A two-way ANOVA revealed an epistatic interaction between the two QTLs in the F2 population (P = 0.0084). This interaction was confirmed by an analysis of F3 QTL-NILs indicating that both QTLs are involved in the same genetic mechanism controlling GW. The gw8.1 QTL was further mapped between two SSR markers, RM23204 and RM23211, which are 110.1 kb apart. To our knowledge, this is the first report using QTL-NILs to reveal an epistatic interaction between QTLs for GW. <br>

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