水稻条斑病菌致病力分化研究

Virulence differentiation of Xanthomonas oryzae pv.oryzicola

在历年测定的基础上,选择了从国内各地收集的28个水稻条斑病菌株,用针刺法接种在一套有鉴别力的水稻品种上,结果表明,不同菌株间的致病力差异显著,条斑病菌株与水稻品种间的互作反应大多表现弱互作模式,部分菌株与品种间存在强互作关系,根据供试菌株在鉴别品种IRBB5、IRBB7、IRBB3、IRBB21和JG30上致病力的差异,可区分成5种反应模式,分别为RRRRS、RRRSS、RRSSS、RSSRS、RSSSS.

The pathogenicity of 28 X.o.pv.oryzicola strains collected from different areas in China were identified based on strain-cultivar interaction.5 of 19 varieties with different resisitance genes were selected and compose a set of differential varieties(IRBB5?IRBB7?IRBB3?IRBB21 and JG30).Upper leaves were inoculated with selected strains by needle puncture.Accoding to the virulence against the differential varieties conducted,It shows that the virulence of these strains was differentiated distinctly.Weak interaction patterns were proved mainly between pathogens and rice varieties,Some strong interaction was discovered.They were RRRRS?RRRSS?RRSSS?RSSRS?RSSSS.It was suggested that the X.o.pv.oryzicda can be classified into 5 race groups of pathotypes.