我国甘薯新病害-茎腐病的研究初报

 2006年以来广东省主要甘薯产区发现1种甘薯新病害，主要症状表现为叶片变黄，茎基部呈黑色水浸状腐烂，并逐渐沿茎枝向顶端腐烂，后整株倒伏、死亡。从甘薯病茎部分离得到了病菌，经柯赫法则验证为致病病原菌。根据病原菌的形态特征、培养性状、生理生化及16S rDNA序列分析，鉴定其为菊欧文氏菌(Erwinia chrysanthemi)。采用茎枝、菌液共培养法接种8个甘薯品种，结果表明8个品种均无抗病性，病原菌致病性较强。这是我国首次发现该病害。 

A new bacterial stem and root rot disease of sweetpotato in Guangdong, China

A suspected new disease of sweetpotato was observed at a number of sweetpotato production areas in Guangdong Province since 2006.The disease symptoms often appear as yellow leaves and black water-soaked rot extending from the bottom to the top of stems resulting in collapse and death of the entire plant.Bacterial strains were isolated from the diseased seedling stems of sweetpotato.Inoculation of sweetpotato seedlings with the isolates caused the same symptoms as naturally infected plants.The isolate H12 wa...