小麦新抗源贵农775抗条锈性特征与遗传分析  

Characterization and inheritance of resistance to stripe rust in the wheat line Guinong775

作　　者：韩德俊[1,2] 王宁[1,2] 江峥[1,2] 王琪琳[1,3] 王晓杰[1,3] 康振生[1,3] 

机构地区：[1]西北农林科技大学,旱区作物逆境生物学国家重点实验室,杨凌712100 [2]西北农林科技大学农学院,杨凌712100 [3]西北农林科技大学植物保护学院,杨凌712100

出　　处：《遗传》2012年第12期1607-1613,共7页Hereditas（Beijing)

基　　金：国家高技术研究发展计划(863计划)项目(编号:2012AA101503);公益性行业(农业)计划项目(编号:201203014);国家自然科学基金项目(编号:30871603)资助

摘　　要：发掘并利用不同类型抗条锈病基因,构建区域间抗病基因多样性差异布局,是阻遏条锈菌大区域传播、实现小麦条锈病持续控制的重要策略。为了明确小麦新抗源贵农775抗条锈性特征和抗性遗传规律,为其合理布局应用提供依据,文章利用10个条锈菌菌系进行苗期分小种鉴定;构建贵农775与感病品种Avocet(S)杂交后代F2:3及回交BC1遗传群体,利用小麦条锈菌流行小种CYR32和最近发现的对Yr26基因有毒性的新致病类型CH42,对贵农775进行抗条锈性遗传分析。结果表明,贵农775对包括CH42致病类型在内的所有10个供试菌系均表现为免疫或近免疫的抗病性反应,而中国当前主要条锈病抗源品种92R137、川麦42(YrCH42)、贵农22(YrGN22)及Yr24等均不抗CH42;抗病遗传分析结果表明,贵农775对小麦条锈菌小种CYR32和CH42的抗性分别由一对显性核基因控制,并且为不同的小种专化抗性基因。Exploring different types of resistance genes and deploying diversity resistance genes among different wheat producing regions are important strategy to control stripe rust epidemic in large scale.The resistance spectra of the wheat line Guinong 775 at seedling stage was tested in greenhouse with ten isolates of Puccinia triticina West.f.sp.tritici;and the inheritance of resistance was investigate with F2：3 and BC1 populations derived from a cross between Guinong 775 and a susceptible cultivar Avocet（S）,inoculated with isolates CYR32 and CH42,which poses a notable threat to current wheat varieties carrying Yr26 resistance gene.The results showed that Guinong 775 was immune or nearly immune to all the tested races;however,the resistant germplasm 92R137,Chuanmai 42,Guinong 22,and Yr24/6＊Avocet（S） were susceptible to CH42.The resistance of Guinong 775 was conferred by a single dominant gene to CYR32 and another single dominant gene to CH42,and these genes proved to be different.

关 键 词：小麦条锈病 抗锈性特征 抗病遗传分析 抗病基因多样性 Yr基因布局 

分 类 号：S512.1[农业科学—作物学]