水稻苗期抗旱性的QTL分析  

Mapping QTLs for Drought Resistance at Seedling Stage in Rice by Using a Doubled Haploid Population

作　　者：徐群[1] 袁筱萍[1] 余汉勇[1] 王一平[1] 汤圣祥[1] 魏兴华[1] 

机构地区：[1]中国水稻研究所水稻生物学国家重点实验室,浙江杭州310006

出　　处：《中国水稻科学》2010年第5期469-473,共5页Chinese Journal of Rice Science

基　　金：中央级公益性科研院所专项资金资助项目(2009RG001-3);浙江省农业重大科技项目(2007C12073);国家科技支撑计划资助项目(2006BAD13B01-5)

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QTLNetwork2.0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。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.

关 键 词：水稻 抗旱性 加倍单倍体群体 数量性状基因座 

分 类 号：S511[农业科学—作物学]