水稻穗部性状的QTL分析

Dissection of QTLs for Panicle Traits in Rice(Oryza sativa)

水稻穗部性状与产量关系密切。以粳稻品种日本晴和一个大穗籼稻材料H71D为亲本构建F2群体,于2011和2012年分别以172个单株和138个单株,对穗长、一次枝梗数、二次枝梗数、总粒数、穗着粒密度等5个穗部性状进行QTL定位。以LOD≥3为阈值,两年共检测到38个QTL,其中2011年21个,2012年17个,2年重复检测到的QTL为4个,占总数的10.5%。5个性状之间大都具有显著的表型相关性,相关性较强的性状之间具有较多相同或紧密连锁的QTL,效应值较大的QTL易于在不同群体和不同环境中被重复检测到。检测到的QTL为进一步进行元分析和精细定位打下了基础,也为通过分子标记辅助选择提高产量提供了有用信息。

Rice yield potential is closely related to panicle traits. QTLs for five panicle traits including panicle length, number of primary branches, number of secondary branches, spikelets per panicle and seed setting density were identified by using 172 plants and 138 plants from a F2 population derived from a cross between Nipponbare and H71D in 2011 and 2012 respectively. A total of 38 QTLs were detected in the two trials, including 21 QTLs in 2011 and 17 QTLs in 2012, of them four QTLs （only 10.5%） were repeatedly detected in both years. Some QTLs controlling different traits shared the same maker interval on the chromosome with each other, which was consistent with their significant phenotypic correlations. QTLs with large effects are easily to be detected in kinds of populations and different environments. These QTLs provide useful information for meta-analysis and fine mapping, as well as MAS for high-yield rice breeding.