甜玉米雄穗一级分枝数QTL定位  

QTL mapping for tassel primary branch number in sweet corn

作　　者：张姿丽[1] 蒋锋[1] 刘鹏飞[1] 陈青春[1] 张媛[1] 王晓明[1] 

机构地区：[1]仲恺农业工程学院作物研究所,广东广州510225

出　　处：《华南农业大学学报》2014年第1期110-113,共4页Journal of South China Agricultural University

基　　金：公益性行业(农业)科研项目(201303008);广东省科技计划项目(2012B020301006)

摘　　要：【目的】为改良玉米雄穗性状．【方法】以雄穗一级分枝数有显著差异的超甜玉米自交系T4和T19为亲本，构建了包含232个单株的F：群体，考察雄穗一级分枝数，利用复合区间作图法进行QTL定位．【结果和结论】结果获得一张包含77个SSR标记的遗传连锁图谱，全长868．7cM，标记平均间距为11．28cM，共检测到4个与超甜玉米雄穗一级分枝数相关的QTL位点，分别位于玉米第4、7、8染色体上，可解释5．08％～17．71％的表型变异．主效QTL位点q船Ⅳ-4位于第8染色体，可解释17．71％的表型变异．这些QTLs将为雄穗一级分枝数的分子标记辅助选捧提供依据．[ Objective ] To improve the tassel of maize. [ Method ] In this study, a cross between sweet corns inbred T4 and T19, which were significantly different in tassel primary branch number, was de- signed and QTLs for tassel primary branch number were identified in a whole genome with the methods of multiple interval mapping （CIM） based on 232 F2 individuals. [ Result and conclusion ] A genetic link- age map composing of 77 simple sequence repeat （SSR） markers covering 868.7 cM with an average in- terval of 11.28 cM was constructed. Four QTLs for tassel primary branch number in chromosome 4, 7, 8 were detected, accounting for 5.08% - 17.71% of phenotypic variance. The main QTLs were located on chromosome 8 which accounted for 17.71% of the total phenotypic variance. These QTLs provide the ba- sis of marker-assisted selection for tassel primary branch number.

关 键 词：甜玉米 雄穗一级分枝数 复合区间作图 QTL 

分 类 号：S513[农业科学—作物学]