甘肃省白银市黄瓜细菌性流胶病病原菌的鉴定
陈斐 , 王一丹 , 马婷 , 蔡锋锋 , 金梦军 , 张翠文 , 杨成德
中国瓜菜 ›› 2024, Vol. 37 ›› Issue (7) : 36 -41.
甘肃省白银市黄瓜细菌性流胶病病原菌的鉴定
Identification of cucumber bacterial gummosis pathogens in Baiyin city, Gansu province
黄瓜具有重要的经济价值,为明确引起甘肃省黄瓜细菌性流胶病病原菌的种类,对采集自甘肃省白银市具有典型流胶症状的样本利用组织分离法进行病原物的分离,并通过柯赫氏法则验证其致病性,再利用形态特征和分子生物学方法进行鉴定。结果表明,从发病的黄瓜茎秆中共得到4株分离物,分别命名为hxb 1,hxb 2,hxb 3和hxb 4。经柯赫氏法则验证,hxb 1是引起黄瓜流胶病的病原菌,在NA培养基上菌落呈乳白色或半透明状,圆形或近圆形,边缘光滑,菌体大小为(0.253~0.511)μm×(0.783~2.290)μm, 为短直杆状,革兰氏染色阴性。再利用16S rRNA和 gyrB进行基因序列分析,发现hxb 1均与荧光假单胞菌(Pseudomonas fluorescens)聚在一支,同源性均为100%,结合形态学特征将菌株hxb 1鉴定为荧光假单胞菌。研究结果为黄瓜细菌性流胶病的诊断和综合防治提供了理论依据。
In order to clarify the pathogen of cucumber bacterial gummosis in Gansu province, the samples collected from Baiyin city with typical gummosis symptoms were isolated by tissue separation method, and the pathogenicity was verified by Koch's postulate. Then morphological characteristics and molecular biology methods were used for identification. The results showed that four isolates were obtained from the diseased cucumber stems, named hxb 1, hxb 2, hxb 3 and hxb 4, respectively. It was verified by Koch's postulate that hxb 1 was the pathogen causing cucumber gummosis, and its colonies on NA medium were milky white or translucent, round or nearly round, with smooth edges. The cell size was (0.253-0.511) μm×(0.783-2.290) μm, which was short straight rod and gram-negative. Using 16S rRNA and gyrB genes sequence analysis, it was found that hxb 1 was clustered with Pseudomonas fluorescens, and the homology was 100%. Combined with morphological characteristics, the strain hxb1 was identified as Pseudomonas fluorescens. The research results provide a theoretical basis for the diagnosis and comprehensive prevention of cucumber bacterial gummosis.
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甘肃省瓜菜产业技术体系(GARS-GC-2)
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