我国小麦地方品种蚂蚱麦、小白冬麦、游白兰、红卷芒抗白粉病性遗传分析

我国地方品种是小麦白粉病抗性的重要来源之一,为了对地方品种抗源的利用奠定基础,采用常规杂交方法,以感病品种Chancellor分别与我国小麦抗病地方品种蚂蚱麦、小白冬麦、游白兰、红卷芒进行正交和反交,获得F₁、F₂代。根据白粉菌菌株的毒谱选用E09菌株对Chancellor与小白冬麦、游白兰、红卷芒的杂交后代进行苗期抗性鉴定和统计分析,选用E30菌株对Chancellor与蚂蚱麦的杂交后代进行苗期抗性鉴定和统计分析。结果表明4个品种在正、反交情况下均表现出由一对隐性基因控制的抗性,说明这4个地方品种属于核遗传,其抗性是由一对隐性基因控制的。

Inheritance of resistance to powdery mildew in four Chinese landraces

The inheritance of resistance of the four wheat landraces Mazha,Xiaobaidong,Youbailan,Hongjuanmang to Blumeria graminis f.sp.tritici was analyzed by reciprocal crosses and test cross with a susceptible cultivar Chancellor,respectively.The resistance of Mazha and its hybrid progenies was analyzed genetically by artificial inoculation with isolate E30 of B.graminis f.sp.tritici at seedling stage,while the resistance of Xiaobaidong,Youbailan,Hongjuanmang and their hybrid progenies was analyzed genetically by artificial inoculation with isolate E09 of B.graminis f.sp.tritici at seedling stage.Chi-square tests were employed to analyze the inheritance of the four landraces.The results showed that the F2 populations segregated at the ratio of 1R∶3S,and the progenies segregated at the ratio of 1R∶1S in test cross.These results ascertained that a single recessive gene conferred the resistance to powdery mildew in the landraces at seedling stage.