Analysis of Epistatic and QE Interaction Effects of QTL Controlling Heading Date in Rice (Oryza sativa L.)
Zhang Jiaoping Jiang Liangrong Huang Jianxun Zhang Kai Wang Houcong Huang Yumin*School of Life Science, Xiamen University, Xiamen, 361005
Heading date (HD) is an important agronomic trait in rice, and detailed understanding of HD's genetic effects is significant for rice breeding practice. Quantitative Trait Locus (QTL) controlling HD of rice in different seasons and environments was analyzed using two Recombination Inbred Lines (RIL) respectively derived from crosses of Minghui86 × Jiafuzhan (MJ) and Guangluai × Jiafuzhan (GJ) by mixed linear model approach. 10 QTL with additive effects for HD were mapped in the chromosome 1, 2, 3, 6, 7 and 10 totally, and the qHD10 (qHD10-1 as in GJ-RIL) was mapped in both RIL. 22 QTL with epistatic effects for HD in these two RIL were detected, and 5 of them were QTL with additive effects. QTL× environment interaction was detected on qHD10 in MJ and qHD7 in GJ, each explain the phenotypic variation of HD with 0.34% and 2.32%. This demonstrates that QTL× environment interaction has minor influence to HD in these two RIL, and they are suitable for Molecular marker-assisted breeding, specially to MJ population.
【CateGory Index】： S511