烟草青枯病菌种保存方法及其对致病力的影响

Effects of Different Preservation Methods on Pathogenicity of Bacterial Wilt Strains in Tobacco

为在烟草青枯病的防治和烟草抗病性鉴定研究中获得致病力较强的菌株,分别采用烟草组培苗活体保存、灭菌蒸馏水常温保存以及斜面冰箱保存3种不同方法保存烟草青枯病菌,并比较了3种保存方法对烟草青枯病菌致病力的影响。结果表明:烟草组培苗活体保存法和灭菌蒸馏水常温保存法均具有较好的保持青枯病菌致病力活性的能力,前者比后者稍强,如需提取粗毒素,则建议使用后者,斜面冰箱保存法的致病力下降最快。

Three strain preservation methods of tissue culture tobacco plantlets,sterilized distilled water under normal temperature and slant culture in a refrigerator were compared to study the effect of different preservation methods on pathogenicity of tobacco bacterial wilt bacteria and to select higher pathogenicity stains for control and resistance identification of tobacco bacterial wilt.The results showed that the tissue culture tobacco plantlets preservation and sterilized distilled water preservation under normal temperature both could keep the pathogenicity activity of bacterial wilt bacteria,and the tissue culture tobacco plantlets preservation was better than the sterilized distilled water preservation under normal temperature.When preservation of tobacco bacterial wilt strains is used to extract crude toxin,the sterilized distilled water preservation under normal temperature is better than the tissue culture tobacco plantlets preservation.