【摘要】 通过小麦白粉菌菌株之间的有性杂交，获得１个白粉菌杂交分离群体。对该群体中各个体在鉴别寄主上进行了无毒性／毒性反应的测定，结果表明：对应于小麦抗病基因Ｐｍ４ａ、Ｐｍ４ｂ和品种白免３号、Ｅｒａ抗性的小麦白粉菌无毒性分别由１对基因控制；对应于Ｐｍ３ｂ的无毒性／毒性分离在杂交群体中偏离１对或２对基因的分离比例。对应于Ｐｍ４ａ、Ｐｍ４ｂ和白免３号抗性的３个无毒位点之间完全连锁，在杂交群体中共分离；该３个位点与Ｅｒａ抗性对应的无毒位点之间不具有连锁性。更多还原

【Abstract】 A segregating population of Erysiphe graminis f.sp. tritici was constructed by crossing two isolates. The avirulence/virulence of the individual progenies were evaluated on five differential hosts. The results indicate that the four avirulences which matched the resistance genes Pm4a, Pm4b and the resistance of cvs Baimian 3 and Era, respectively, were controlled by single genes, respectively. The avirulence/virulence segregation did not match the resistance gene Pm3b, however, fit into the mode of single gene segregation. The avirulence genes matching Pm4a, Pm4b and the resistance of cv. Baimian 3 were linked completely but they did not link to the avirulence matching the resistance of cv. Era.更多还原