紫外线对番茄青枯菌致病性变化的影响

Effect of UV-ray on Virulence of Ralstonia solanacearum for Tomato Bacterial Wilt

紫外线的亚致死剂量、致死剂量对青枯雷尔氏菌作用的实验表明:亚致死剂量照射不同时间对青枯雷尔氏菌强致病力菌株有不同程度地促进作用,而无杀灭作用及任何抑制和致弱现象;致死剂量照射对强致病力菌株和无致病力菌株影响不同,结果差异极显著,无致病力菌株对紫外线的耐受力要高于强致病力菌株.致死剂量紫外线对强致病力菌株处理2min,抑制率即达100%,致弱率为0;无致病力菌株照射2min与4min的处理,抑制率分别为70.3%和96.3%,处理8min以上,抑制率达100%.

Lethal dose and sublethal dose of UV-ray acted on Ralstonia solanacearum.The results indicated that different rediation time with sublethal dose could accelerate growth of virulent strain to different degrees,but did not kill it or attenuated its virulence.The virulent strain and avirulent strains both radiated for different time respectively showed remarkable differences of tolerance ability by lethal dose and statistical discrepancy.The tolerance ability to UV-ray radiation for the aviruent strain was better than that for the virulent strain.After 2 min to UV-ray,inhibiting rate of the virulent strain was 100% and attenuation rate was 0,while inhibiting rate of the avirulent strain was 70.3%,96.3% and 100% after radiated by UV-ray for 2 min,4 min and 10 min,respectively.