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核农学报  2012 

玉米叶夹角和叶向值的QTL定位

, PP. 231-237

Keywords: 玉米,复合区间作图,叶夹角,叶向值,QTL定位

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Abstract:

叶夹角和叶向值是评价玉米株型的重要指标。本研究以甜玉米自交系组合T14×T4的F2为作图群体,构建了包含192个SSR标记位点的遗传连锁图谱,覆盖玉米基因组1260cM,平均图距6.56cM。通过测定F2、F23家系的叶夹角和叶向值,应用复合区间作图法在两个世代中共检测到26个QTL,其中14个与叶夹角相关的QTL,分别位于第2、5、6、7和8染色体上,单个QTL可解释的表型变异为3.3%~26.2%;12个与叶向值相关的QTL,分布于第1、2、3、7和10染色体上,单个QTL可解释的表型变异为3.1%~20.7%。在第2、3、5染色体上分别检测到1、1、2个同时在F2、F23家系都稳定表达的QTL,分别落在区间bnlg1329~bnlg1613、umc1148~umc2275和umc1097~umc1692,可作为相关数量性状基因的候选基因。发现1个同时控制叶夹角和叶向值性状的QTL,位于第2染色体上的bnlg1017-umc2129区间,对两性状的表型贡献率分别为10.8%和10.6%。本研究的结果有望为玉米耐密型育种及分子辅助选择育种提供一定的理论依据。

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