Detection of QTLs controlling heading date in the process of rice development at two environments
在两个环境中检测控制水稻抽穗期的QTL

Heading date (HD) is a major determinant of the regional and seasonal adaptation of rice varieties. In order to elucidate the quantitative trait loci (QTL) for HD in the process of rice development, a doubled haploid (DH) population was employed to map QTLs controlling HD at different heading stages in two locations, Hainan (HN) and Hangzhou (HZ) in China. The results indicated that a total of 8 QTL were identified at two environments and seven stages which were located on chromosomes 1, 6, 8, 10 and 12. Two QTL, qHD 1 1 and qHD 12 could be detected at both environments, the others were only detected at one environment. One QTL in HN, qHD 10 1, exerted its effect during 75 85 DAG (days after germination) and could explain 19.6% of the total variation. A major QTL, qHD 8 1 in HZ, showed its effect during 80 90 DAG. The other QTL were only detected in one stage, such as qHD 6 and qHD 10 2 were both specific for 80 DAG in HN, while qHD 1 2 and qHD 8 2 were specific for 85 and 80 DAG in HZ, respectively. Based on the QTL mapping results, we proposed a QTL effect timing model for the HD controlling QTLs.