Lu Ming, Zhou Fang, Xie Chuan-Xiao, Li Ming-Shun, Xu Yun-Bi, Marilyn Warburton, Zhang Shi-Huang
Maize Center, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
Yi Chuan. 2007 Sep;29(9):1131-8. doi: 10.1360/yc-007-1131.
Maize (Zea mays L.) breeders have begun selecting for more compact plants for higher density planting in order to increase yield per unit area. Leaf angle and leaf orientation are very important traits affecting maize plant type (compactness). In this study, a genetic linkage map containing 138 simple sequence repeat (SSR) markers was constructed based on a mapping population consisting of 500 F2 individuals from the cross between inbred lines Ye478 and Dan340. This SSR linkage map spans a total of 1 394.9 cM with an average interval of 10.1 cM. Quantitative trait loci (QTL) for leaf angle and leaf orientation were identified in 397 F2:3 families. Six QTL for leaf angle were detected that could explain 41.0% of the phenotypic variation; while, eight QTL were detected for leaf orientation that could explain 60.8% of the phenotypic varia-tion. Single QTL contribution to phenotypic variation ranged from 2.9% to 13.6%. Additive and partial dominance were the main genetic effects for leaf angle and leaf orientation; in addition, nine pairs of locus interactions were detected for the two traits, indicating that epistatic interactions at the two-loci level also play a measurable role in the genetic basis of the two traits.
玉米（Zea mays L.）育种者已开始选育植株更为紧凑的品种，以便进行更高密度种植，从而提高单位面积产量。叶角和叶片着生方向是影响玉米株型（紧凑度）的非常重要的性状。在本研究中，基于一个由自交系掖478和丹340杂交产生的500个F2单株组成的作图群体，构建了一张包含138个简单序列重复（SSR）标记的遗传连锁图谱。这张SSR连锁图谱总长1394.9 cM，平均间距为10.1 cM。在397个F2:3家系中鉴定了叶角和叶片着生方向的数量性状位点（QTL）。检测到6个叶角QTL，可解释表型变异的41.0%；同时，检测到8个叶片着生方向QTL，可解释表型变异的60.8%。单个QTL对表型变异的贡献率在2.9%至13.6%之间。加性效应和部分显性是叶角和叶片着生方向的主要遗传效应；此外，还检测到这两个性状的9对位点互作，表明两位点水平的上位性互作在这两个性状的遗传基础中也发挥了可测量的作用。
