水稻苗期形态性状的QTL定位

采用苗期形态性状上有着明显差异的粳稻Asominori和籼稻IR24杂交产生的重组自交系（RILs）为材料,经营养液培养后,对水稻苗期形态相关的6个数量性状：最大根长（MRL）、苗高（SH）、根干重（RDW）、茎（叶）干重（SDW）、总重（TW）以及根/茎（叶）干重比（RSR）进行了数量性状位点（QTL）定位分析.结果共检测到影响6个形态性状的8个QTL位点,分别位于水稻的第2,4,10和11染色体上,其贡献率为9.79%～22.90%.并发现位于第4染色体上的控制根/茎（叶）干重比的qRSR-4和根干重的qRDW-4的2个位点以及位于第10染色体上的控制茎（叶）干重的qSDW-10和总重的qTW-10的2个位点分别位于同一分子标记区间.研究结果对水稻苗期形态性状QTL的精细定位及培育理想株型具有一定的应用价值.

Mapping QTLs for morphological traits at rice(Oryza sativa L.) seedling stage

This study was conducted to identify quantitative trait loci（QTLs） associated with maximum root length（MRL）, shoot height （SH）, root dry weight（ RDW）, shoot dry weights （SDW）, total weight（TW） and root/shoot ratio of dry weight（RSR）, mainly representing the seedling morphological characteristics using a recombinant inbred lines （RILs） derived from a cross between a japonica variety, Asominori and an indica variety, IR24, cultivated by hydroponics. Resultantty, eight QTLs for six seedling morphological traits were detected on chromosome 2 （three QTLs）, 4（two QTLs）, 10（two QTLs）, 11, respectively, which could explain 9.79% - 22.90% of total phenotypic variance. Interestingly, it was found that the genomic region of qRSR- 4 for RSR coincided with qRDW -4 for RDW on chromosome 4, and the region of qSDW - 10 for SDW did with qTW - 10 for TW on chromosome 10, respectively. The results will be useful in fine mapping for genes associated with seedling - morphology and breed- ing ideal seedling morphology in rice.