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为了增加单位面积产量,玉米育种者已经开始了更密植更紧凑株型的选育。叶夹角和叶向值是评价玉米株型的重要指标。本研究以掖478×丹340的500个F2单株为作图群体,构建了具有138个位点的SSR标记连锁图谱,图谱总长度为1394.9cM,平均间距10.1cM。利用397个F2:3家系对叶夹角和叶向值进行QTL定位分析,结果表明:叶夹角和叶向值分别检测到6和8个QTL,累计解释表型变异41.0%和60.8%,单个QTL的贡献率在2.9%～13.6%之间。与叶夹角和叶向值有关的基因主要作用方式为加性和部分显性。此外两个性状共检测到9对上位性互作位点,表明上位性互作在叶夹角和叶向值的遗传中也起较重要的作用。
In order to increase yield per unit area, corn breeders have begun breeding more dense and more compact plant types. Leaf angle and leaf value is an important indicator of plant type. In this study, 500 F2 individuals from Zhang 478 × Dan 340 were used as a mapping population, and a linkage map of 138 SSR loci was constructed with a total length of 1394.9 cM and an average spacing of 10.1 cM. QTL analysis of leaf angle and leaf value using 397 F2: 3 lines showed that 6 and 8 QTLs were detected by leaf angle and leaf direction, respectively. The total phenotypic variation explained 41.0% and 60.8%, respectively. The contribution rate of a single QTL is 2.9% ~ 13.6%. The main mode of action of genes related to leaf angle and leaf value is additive and partial dominant. In addition, a total of 9 pairs of epistasis sites were detected in the two traits, indicating that the epistatic interactions also play a more important role in the inheritance of leaf angle and leaf value.