水稻苗期抗旱性的QTL分析

doi:10.3969/j.issn.1001-7216.2010.05.004

摘要/Abstract

摘要： 利用251个株系组成的Maybelle／白叶秋的加倍单倍体群体，构建了由226个SSR分子标记组成的遗传图谱。通过两年抗旱棚苗期抗旱性鉴定，应用复合区间作图法和QTLNetwork 2.0对水稻苗期抗旱性进行QTL定位及互作效应分析。利用前者在两年共检测到5个抗旱性相关QTL，分别位于第2、3、5、6和8染色体；而通过后者在第2、3、5和6染色体上也找到了抗旱性相关的QTL，并且通过两种方法检测到的第3、5、6染色体上的3个QTL所在区间吻合；还发现4个具有上位性的QTL。所有抗旱性QTL的加性效应均为正值，表明来自父本白叶秋的这些抗旱性位点可以提高水稻的抗旱性。

关键词: 水稻, 抗旱性, 加倍单倍体群体, 数量性状基因座

Abstract: Abstract: The QTLs for drought resistance at the seedling stage were analyzed by using a doubled haploid (DH) population consisted of 251 lines from the cross between a japonica parent Maybelle and an indica parent Baiyeqiu. A genetic linkage map with 226 SSR markers was constructed. Through singlelocus analysis following composite interval mapping (CIM), a total of 5 QTLs were detected on 5 different chromosomes. Four QTLs were also detected by twolocus analysis, which resolved 4 epistatic QTLs (EQTLs). The additive genetic effects of all QTLs were positive, indicating the alleles from Baiyeqiu improve drought tolerance of the DH population.

Key words: rice, drought resistance, doubled haploid population

徐群,袁筱萍,余汉勇,王一平,汤圣祥,魏兴华. 水稻苗期抗旱性的QTL分析[J]. 中国水稻科学 2010,24(5): 469-473 . , DOI: 10.3969/j.issn.1001-7216.2010.05.004 .

XU Qun,YUAN Xiao-ping,YU Han-yong,WANG Yi-ping,TANG Sheng-xiang,WEI Xing-hua* . Mapping QTLs for Drought Resistance at Seedling Stage in Rice by Using a Doubled Haploid Population[J]. Chinese Journal of Rice Science 2010,24(5): 469-473 ., DOI: 10.3969/j.issn.1001-7216.2010.05.004 .

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