研究了8个籼稻抗病品种川植4号、川植5号、三黄占2号、二九丰、扬稻1号、75—34、83007、NT02和1个粳稻抗病品种湘虎25对水稻白叶枯病菌系P1、HB84-17或T_1的抗性遗传.这些抗病品种分别与感病品种沈农1033或金刚30杂交,所得的F_1、F_2和B_1F_1群体的抗性反应,表明8个籼稻品种对P_1和HB84-l7的全生育期抗性均由一对不完全显性的基因控制,该抗性基因与Xa-4是等位的;粳稻品种湘虎25的成株抗性则由一对显性基因控制,该基因与Xa-3相等位. Eight resistant indica rice varieties, Chuanzhu 4, Chuanzhi 5, Sanhuangzhan 2, Erjiufeng, Yangdao 1, 75-34, 83007, NT02 and one japonica resistant cultivar Xianghu 25 Resistance to the bacterial blight of rice bacterial blight P1, HB84-17 or T_1.The resistance of these resistant cultivars to the susceptible cultivar Shennong 1033 or Jingang 30, respectively, resulted in the resistance of the F_1, F_2 and B_1F_1 populations The resistance of 8 indica cultivars to P 1 and HB84-l7 during the whole growth period was controlled by a pair of imperfect genes. The resistant gene was allelic to Xa-4. Sex is controlled by a pair of dominant genes that are the same as Xa-3.