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测定了１２个水稻抗白叶枯病基因对中国白叶枯病菌７个致病型的１０个菌株的抗性反应。结果表明：Ｘａ－４、ｘａ－５、Ｘａ－７、ｘａ－１３和Ｘａ－２１等５个抗病基因在苗期、分蘖期和孕穗期对病菌侵染均表现为广谱抗病反应。进一步将３个带显性广谱抗病基因的材料ＩＲＢＢ４（Ｘａ－４）、ＩＲＢＢ７（Ｘａ－７）和ＩＲＢＢ２１（Ｘａ－２１）与６个常规感病品种和５个常用不育系及相应保持系配组，对其Ｆ１代杂种用病菌致病型Ⅱ和Ⅳ的ＫＳ－６６和ＺＪ－１７３菌株进行接种，发现抗病基因Ｘａ－７和Ｘａ－２１在杂种Ｆ１中对病菌表现抗病反应，而抗病基因Ｘａ－４在杂种Ｆ１中仅表现中抗反应。提出了在水稻抗白叶枯病育种中应加快对显性广谱抗病基因Ｘａ－７和Ｘａ－２１的利用
The resistance of 12 rice bacterial blight resistance genes to 10 strains of pathogenic bacteria of Xanthomonas oryzae was determined. The results showed that five disease-resistance genes Xa-4, Xa-5, Xa-7, Xa-13 and Xa-21 exhibited broad-spectrum resistance to pathogen infection at the seedling, tillering and booting stages. Further, three materials (IRBB4 (Xa-4), IRBB7 (Xa-7) and IRBB21 (Xa-21) with dominant broad-spectrum disease resistance genes and three conventional susceptible cultivars and five commonly- The F1 hybrids were inoculated with KS-66 and ZJ-173 strains of pathogenic strains II and IV, and the resistance genes Xa-7 and Xa-21 were found to be resistant to pathogens in F1 hybrids While the resistance gene Xa-4 showed only moderate anti-response in hybrid F1. It is proposed that the utilization of the dominant broad-spectrum resistance genes Xa-7 and Xa-21 should be accelerated in the breeding of rice bacterial blight resistance