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首页> 外文期刊>Plant Disease >First Report of a New Disease of Onion in Georgia Caused by a Nonfluorescent Pseudomonas Species
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First Report of a New Disease of Onion in Georgia Caused by a Nonfluorescent Pseudomonas Species

机译：非荧光假单胞菌种引起的乔治亚州洋葱新病的首次报道

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Since 2007, a new disease of onion (Allium cepa) called yellow bud has been a problem in Georgia. Emerging leaves display intense chlorosis and older leaves exhibit extensive leaf blight. Yield reductions can be severe due to stand loss and reduced bulb size. Symptomatic plants are also more prone to freeze damage. The suspected causal agent is a slow-growing, white bacterium isolated onto nutrient agar (NA) by streak isolation. The bacterium grew more vigorously on NA supplemented with 0.5% yeast extract (NA+). Six strains of the bacterium all had gram-negative, rod-shaped cells and were strict aerobes. The strains produced levan, were negative for oxidase, potato rot, and arginine dihydrolase, and produced a hypersensitive reaction in tobacco. These are all characteristics of Pseudomonas group Ia as outlined by Lelliott et al.
机译：自2007年以来，乔治亚州就出现了一种称为黄芽的洋葱新病（Allium cepa）。新兴叶片表现出强烈的萎黄病，老叶片表现出广泛的叶枯病。由于支架损耗和灯泡尺寸减小，产量的降低可能会非常严重。有症状的植物也更容易发生冻害。可疑的病原体是一种缓慢生长的白色细菌，可通过条纹分离法分离到营养琼脂（NA）上。细菌在补充有0.5％酵母提取物（NA +）的NA上生长更旺盛。六株细菌均具有革兰氏阴性，杆状细胞，并且是严格的需氧菌。这些菌株产生了levan，氧化酶，马铃薯腐烂和精氨酸二水解酶呈阴性，并在烟草中产生了过敏反应。如Lelliott等所述，这些都是假单胞菌Ia族的特征。

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