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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

水稻第1染色体长臂上微效千粒重QTL qTGW1.2的验证与分解

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,*   

  1. 1中国水稻研究所 / 国家水稻改良中心 / 水稻生物学国家重点实验室, 浙江杭州310006; 2 杭州师范大学生命与环境科学学院, 浙江杭州310036
  • 收稿日期:2013-11-07 修回日期:2014-01-12 出版日期:2014-05-12 网络出版日期:2014-03-24
  • 通讯作者: 庄杰云, E-mail: jz1803@hzcnc.com, Tel: 0571-63370369
  • 作者简介:庄杰云, E-mail: jz1803@hzcnc.com, Tel: 0571-63370369
  • 基金资助:

    本研究由国家自然科学基金项目(31221004), 国家超级稻育种专项(201301)和水稻生物学国家重点实验室自主研究课题(ZZKT200801)资助。

Validation and Dissection of Minor QTL qTGW1.2 for Thousand-Grain Weight in Rice (Oryza sativa L.)

CHEN Yu-Yu1,2,ZHU Yu-Jun1,ZHANG Hong-Wei1,WANG Lin-Lin1,FAN Ye-Yang1,ZHUANG Jie-Yun1,*   

  1. 1 Chinese National Center for Rice Improvement / State Key Laboratory of Rice Biology / China National Rice Research Institute, Hangzhou 310006, China; 2 College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China?
  • Received:2013-11-07 Revised:2014-01-12 Published:2014-05-12 Published online:2014-03-24
  • Contact: 庄杰云, E-mail: jz1803@hzcnc.com, Tel: 0571-63370369
  • About author:庄杰云, E-mail: jz1803@hzcnc.com, Tel: 0571-63370369

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。

关键词: 水稻(Oryza sativa L.), 数量性状座位, 千粒重, 抽穗期, 近等基因系

Abstract:

Validation and dissection of a minor QTL qTGW1.2 for 1000-grain weight located on the long arm of rice chromosome 1 was reported. Following previous mapping result, two plants carrying heterozygous segments covering the intervals RM11621-RM297 and RM212-RM265, respectively, were selected from the Zhenshan 973/Milyang 46 BC2F7 population. Two sets of near isogenic lines (NILs) in the BC2F8:9 generation were established. QTL analysis using the two NIL sets delimited qTGW1.2 to a region flanked by RM11730 and RM11885. Then, five BC2F9 plants with sequential heterozygous segments overlapped in the region covering qTGW1.2 were selected. From the selfed seeds five BC2F10 populations were constructed and used for QTL analysis by Windows QTL Cartographer 2.5. QTLs for 1000-grain weight were detected in each of the five populations. The additive effect ranged from 0.13 to 0.38 g with the enhancing alleles derived from Milyang 46. Based on comparison of the segregating regions among the five populations, we separated qTGW1.2 into two QTLs, of which qTGW1.2a displaying additive genetic action was located in a 934 kb region flanked by RM11730 and RM11762, and qTGW1.2b displaying positive over-dominance was located in a 2.1 Mb region flanked by RM11800 and RM11885.

Key words: Rice (Oryza sativa L.), Quantitative trait locus, 1000-grain weight, Heading date, Near isogenic line

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