小麦籽粒形态及千粒重性状的QTL初步定位

为研究小麦籽粒形态及千粒重性状的QTL,以普通小麦6044和01-35为杂交组合构建的F8重组自交系（RIL）群体作为试验材料,在山东泰安（山东农业大学试验站）和莱阳（青岛农业大学试验站）两个环境下进行两年田间试验,利用Mapmaker/version 3.0和WinQTLCart软件通过复合区间作图法进行QTL初步定位,在两年两个环境下共检测到12个相关QTL位点,其中关于粒长的2个QTL分别位于2A和2B染色体上,可解释表型变异的25%和12%;4个粒厚QTL位于2A和6A染色体上,可解释表型变异的7%～10%;6个千粒重相关QTL位于染色体2A、4A和6A连锁群上,可解释表型变异的6%～25%;而粒宽QTL在两个地点上都没有检测到。其中相关性高的性状间有一些共同的QTL,表现出一因多效或紧密连锁效应。

QTL Mapping for Traits of Kernel Morphology and Grain Weight in Common Wheat

QTLs of kernel morphology and grain weight were investigated using a recombinant inbred line population derived from a cross between 6044×01 35 which were grown in Tai'an and Laiyang locations. Twelve QTLs for kernel morphology and 1000 grain weight were detected using Mapmaker/version 3.0 and WinQTL Cart based on composite interval mapping(CIM).Two QTLs for kernel length were detected on chromosomes 2A and 2B which could explain 25% and 12% of phenotypic variance; four kernel thickness QTLs were detected on chromosomes 2A and 6A across two environments, explaining 7%~10% of phenotypic variance; six 1000 grain weight QTLs were detected on chromosomes 2A, 4A and 6A across two environments, explaining 6%~25% of phenotypic variance. There was no kernel width QTL detected in two environments. Some traits shared the same QTL, which was consistent with its high phenotypic correlations and showed tight linkages or pleiotropisms.