超级杂交稻协优9308重组自交系主茎叶片数的动态QTL分析

QTL Analysis for Leaf Number on Main Stem in RILs of Super Hybrid Rice Xieyou 9308

利用超级杂交稻协优9308(协青早B×中恢9308)衍生的重组自交系群体,采用条件复合区间作图法对主茎叶片数进行了动态QTL分析。在各时期检测到5个非条件QTL和2个条件QTL。非条件QTL qLN2.1、qLN2.2、qLN2.3和qLN2.4在第2染色体上成簇分布,单个非条件QTL可解释的表型变异介于11.68%～16.48%。2个条件QTL qLN2.2和qLN2.4表达时段与拔节盛期和抽穗盛期一致。最终只检测到1个叶片数非条件QTL,没有一个叶片数条件QTL能在测定的所有时期都有效应。表明控制水稻叶片数的QTL表达具有时空性。

QTLs for leaf number were identified with a set of recombinant inbred lines （RILs） derived from the cross of Xieqingzao B/Zhonghui 9308 as materials by the conditional composite interval mapping method. Five unconditional QTLs and two conditional QTLs were detected at different growth stages. The unconditional QTLs, qLN2. 1, qLN2.2,qLN2. 3 and qLN2. 4, explained 11.68%-16.48% of phenotypic variation, tending to cluster on the long arm of chromosome 2. QTL analysis showed that the express period of conditional QTLs, qLN2.2 and qLN2.4, were unanimous to the dates of elongating and heading. Only one unconditional QTL for final leaf number was detected, but there was no effect of conditional QTL at all the tested developmental stages, indicating QTLs for leaf number were mainly expressed in spatial and temporal patterns.