作物学报 ›› 2014, Vol. 40 ›› Issue (05): 761-768.doi: 10.3724/SP.J.1006.2014.00761
• 作物遗传育种·种质资源·分子遗传学 • 下一篇
陈玉宇1,2,朱玉君1,张宏伟1,王琳琳1,樊叶杨1,庄杰云1,*
CHEN Yu-Yu1,2,ZHU Yu-Jun1,ZHANG Hong-Wei1,WANG Lin-Lin1,FAN Ye-Yang1,ZHUANG Jie-Yun1,*
摘要:
本文报道了水稻第1染色体长臂上微效千粒重QTL qTGW1.2的验证和分解。针对前期qTGW1.2定位结果, 应用SSR标记检测, 从籼籼交组合珍汕973/密阳46衍生的1个BC2F7分离群体中, 筛选到杂合区间分别为RM11621-RM297和RM212-RM265的2个单株, 构建了两套BC2F8:9近等基因系, 将qTGW1.2进一步界定在RM212-RM265及其两侧交换区间的区域内。在此基础上, 筛选出5个在目标区间内分离片段缩小且呈阶梯状排列的单株, 衍生了5套BC2F10分离群体, 应用Windows QTL Cartographer 2.5进行QTL分析。结果表明, 每套群体均检测到千粒重QTL, 加性效应为0.13~0.38 g, 来自密阳46的等位基因提高千粒重; 经比较各个群体的分离区间, 将qTGW1.2分解为互引连锁的2个QTL, 其中, qTGW1.2a位于RM11730和RM11762之间934 kb的区域内, 呈加性作用, qTGW1.2b位于RM11800和RM11885之间2.1 Mb的区域内, 呈正向超显性。
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