基于染色体片段置换系对水稻粒形及千粒重QTL检测与稳定性分析

粒形及千粒重是水稻产量的重要影响因素,通过挖掘这些性状的优异基因,对水稻超高产育种具有重要意义。本研究利用1套以籼稻恢复系昌恢121为背景亲本,粳稻越光为供体亲本构建的染色体片段代换系为材料,在3个环境下对水稻粒形及千粒重进行QTL检测及稳定性分析,共检测到59个QTL,分布于1号、2号、3号、4号、5号、6号、7号、10号、11号和12号染色体上,贡献率为0.77%～36.26%,其中发现10个QTL多效位点。值得关注的是qGW2-1、qGW2-2、qGW3-1、qGW3-2、qGL3和qGL12这6个QTL能在3个环境中重复检测到,其中qGW3-1为新鉴定的QTL位点。这些结果为进一步开展水稻粒形基因的精细定位、克隆和分子辅助育种奠定了一定的理论基础。

QTL detection and stability analysis of rice grain shape and thousand-grain weight based on chromosome segment substitution lines

Grain shape and 1000-grain weight are the important factors affecting rice yield. Discovering the excellent genes of these traits is of great significance for super high yield rice breeding. In this study, a set of chromosome segment substitute lines (CSSLs), derived from a cross between Koshihikari (a japonica cultivar, as donor patent) and Changhui 121 (an indica restorer line, as a background patent), were used to quantitative trait locus (QTLs) detection and stability analysis in three environments. The results showed that a total of 59 QTLs were identified on chromosomes 1, 2, 3, 4, 5, 6, 7, 10, 11, and 12, respectively, whose contribution rate was 0.77%-36.26%. Among them, 10 pleiotropic QTLs were found, and qGW2-1, qGW2-2, qGW3-1, qGW3-2, qGL3, and qGL12 could all be detected in three environments. Furthermore, qGW3-1 is a novel identified QTL locus. These results lay a foundation for further fine mapping, cloning and marker-assisted breeding of grain shape genes.