云南省烟草野火病菌毒素的致病性评价*

 主要通过对烟草野火病菌菌株（Pseudomonas syringae pv. tabaci）致病力与其粗毒素毒力的相关性的研究，评价了烟草野火病菌毒素在致病过程中的作用。结果表明：①野火菌毒素毒力与其菌株的致病力呈极显著相关性，相关系数r达0.928；②高感和中感品种K326,云85对病原菌的感病性与对菌毒素的敏感性在P<0.05的水平上有相关关系；③从病斑处可以分离到该毒素，再接种能重现野火病症状；④抑菌物质对病原菌和病菌毒素的抑制作用相一致。

The Pathogenicity Appraising of Tabtoxin in Pseudomonas syringae pv. Tabaci in Yunnan

The pathogenicity of tabtoxin is appraised mostly based on whether the pathogenicity of strains is correlative or not with the virulence of their tabtoxins.The results are that: ①The correlation of the tabtoxins virulence and the strains pathogenicity is best significant and the coefficient is 0.928;②The reaction of Yunyan 85 and K326 to the strains and their tabtoxins is correlative at P<0.05 level;③Tabtoxin could be isolated from the disease area and brings about the wild-fire symptom again;④The inhibitory action of inhibitory substance to the strains and their tabtoxins are in agreement.