抗噻枯唑和抗叶枯净的水稻白叶枯病菌株的适应度比较  

THE FITNESS OF SAIKUZUO-RESISTANT STRAINS OF XANTHOMONAS ORYZAE PV ORYZAE IN COMPARISION WITH THOSE OF PHENAZINE OXIDE-RESISTANT ONES

作　　者：王文相[1] 张爱芳[1] 徐瑞琳[1] 叶正荷[1] 

机构地区：[1]安徽省农业科学院植物保护研究所,合肥230031

出　　处：《植物保护学报》2000年第1期79-82,共4页Journal of Plant Protection

摘　　要：将水稻白叶枯病噻枯唑抗性菌(Sa^r)和叶枯净抗性菌(P^r)的适应度(Fitness)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存的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,白叶枯病菌抗药性菌适应度较差,在田间不易建立抗性群体,但不排除在高强度选择压力下也会出现抗性群体的可能。P^r在田间则比Sa^r易于建立抗性群体。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 the chemical resistant strains (R) could not compete with S. But competitive ability of Pr was stronger than that of Sar. There were no differences between the pathogenicity of R and that of S. But the pathogenicity of R lost easily. The pathogenic-ity loss of R was due to the increase of the proportion of S with low pathogenicity in R population preserved. The results showed the fitness of R was less than those of S. It is suggested that the R population do not set up easily in field conditions. Camparing with Sar, Pr population might more easily set up in field conditions. But the results above do not mean that there is no possibility of R population forming under high selective pressure.

关 键 词：水稻白叶枯病 抗药性 适应度 噻枯唑 叶枯净 

分 类 号：S435.11[农业科学—农业昆虫与害虫防治]