采用基因推导法分析了三个鉴别寄主的抗性基因：白免３号和肯贵阿１号含有Ｐｍ４ａ：小白冬麦的抗性受一对隐性基因的控制，其抗谱不同于所有供试单基因系的抗谱。 Three gene-resistance genes were analyzed by gene inference method. The resistance genes of Baimai 3 and Ken-Gui-1 containing Pm4a: Aspirin were controlled by a pair of recessive genes whose anti-spectrum was different from all Anti-spectrum test for single gene line.