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期 刊 ：植物保护学报 2000年

关键词：水稻白叶枯病；抗药性；适应度；噻枯唑；叶枯净；

Keywords:rice bacterial leaf blight, chemical resistance, fitness,

摘 要 ：将水稻白叶枯病噻枯唑抗性菌和叶枯净抗性菌的适应度特性进行了比较。当Ｓａ＾ｒ和Ｐ＾ｒ与敏感菌（Ｓ）的等量混合物在植株上繁殖时，Ｓａ＾ｒ和Ｐ＾ｒ竞争不过Ｓ，但Ｐ＾ｒ竞争能力较Ｓａ＾ｒ强。Ｓａ＾ｒ和Ｐ＾ｒ的致病力与Ｓ的无明显差异。但在离体保存时Ｓａ＾ｒ和Ｐ＾ｒ易于丧失致病力。这种致病力的丧失是由于被保原群体中低致病力的敏感菌比例上升所致，进一步说明Ｓａ＾ｒ和Ｐ＾ｒ的适应度不及Ｓ。结果表明，白叶枯病市民经

Abstract:The fitness of saikuzuo-resistant strains (Sar) of Xanthomonas oryzae pv oryzae was compared with those of phenazine oxide-resistant ones(Pr). When the mixture of Sar or Pr and sensitive strains (S) in "proportion of 1 :1" grew in susceptible rice variety

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