１９９２年和１９９３年用１４个水稻白叶枯病菌系鉴定并分析了５３个品种的抗性，其中４１个材料具有广谱抗性。分析了２１个抗病品种的抗性类型，有９个品种为全生育期抗性，１２个品种表现成株期抗性，其中有些品种与菌系存在着明显的交叉互作反应。本研究根据品种对国际鉴别菌系的系列反应型，初步尝试推测了１７个品种具有Ｘａ－４基因，１０个品种具有Ｘａ－３基因 In 1992 and 1993, 14 strains of rice bacterial blight were identified and analyzed for resistance of 53 varieties, of which 41 were broad-spectrum resistant. The resistance types of 21 resistant cultivars were analyzed. Nine cultivars were resistant at all growth stages and 12 cultivars showed resistance at adult stage. Some cultivars had obvious cross-reaction with bacterial strains. In this study, based on the series of reactionary strains of IBD strains, we initially speculated that 17 cultivars had Xa-4 gene and 10 cultivars had Xa-3 gene