摘要: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.%利用一个DH群体研究了控制抽穗期的QTL,实验分别在杭州(HZ)和海南(HN)两地进行,抽穗期分别在4个和3个不同发育阶段调查.结果表明:在2个环境和7个发育阶段中共检测到8个QTL,分别分布在第1,6,8,10,12号染色体上.其中,2个QTL,qHD-1-1和qHD-12能在2个环境中检测到,其它只能在1个环境中检测到.在HN中一个QTL qHD-10-1主要在发芽后75~85 d检测到其效应,它可解释19.6%的变异.在HZ一个主效QTL qHD-8-1在发芽后80~90 d时检测到效应.其它的QTL只在某一阶段表达.最后讨论了抽穗期QTL的作用模式及其在育种中应用.