【摘要】 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的利用更多还原

【Abstract】 It was evaluated that the reaction pattern of a set of rice near iso lines with 12 resistant genes to the 10 strains from different districts representing 7 pathotypes of Xanthomonas oryzae pv. oryzae . The results indicated that the genes Xa 4, xa 5, Xa 7, xa 13 and Xa 21 were almost resistant to all 7 Chinese pathotypes in the seedling, tilling and flowering stages. Further the F 1 generation between resistant lines: IRBB4 (Xa 4), IRBB7 (Xa 7), IRBB21 (Xa 21) and susceptible cultivars: TN1, IR24, Guichao2, Minghui63, Shuanggui1 and Zhenzhu′ai as well as susceptible cytoplasmic male sterile lines (or maintainers): D ShanA/B, Zhenshan97A/B, Gang46A/B, Xieqingzao A/B, and You ⅠA/B were inoculated with the strains KS 66 (pathotype Ⅱ) and ZJ 173 (pathotype Ⅳ) to test the expression of three dominant resistant genes in hybrid plants. It revealed that the genes Xa 7 and Xa 21 were more resistant than Xa 4 in F 1 generation of all combination tested. It suggested that application of the resistant genes Xa 7 and Xa 21 should be strengthened during the common and hybrid rice breeding resistant to the bacterial leaf blight.更多还原