鉴定1株分离自中国对虾养殖水体的益生菌XE-7。进行了常规生理生化和细菌鉴定系统测试,结果表明,菌株XE-7与烟草节杆菌属(Arthrobacter)细菌的表型特征非常相似。为了进一步确定XE-7的分类学地位,测定了其16SrRNA基因序列,分析了相关细菌相应序列的同源性,构建了系统发生树。结果表明,菌株XE-7与烟草节杆菌(Arthrobacternicotianae)的亲缘关系最近。综合上述结果,菌株XE-7可鉴定为烟草节杆菌(A.nicotianae)。 A strain of probiotic XE-7 isolated from Chinese shrimp farming water was identified. The conventional biochemical and bacterial identification system tests were performed and the results showed that the phenotype of strain XE-7 was very similar to that of Arthrobacter bacteria. In order to further determine the taxonomic status of XE-7, its 16S rRNA gene sequence was determined, the homology of the corresponding bacteria was analyzed, and the phylogenetic tree was constructed. The results showed that strain XE-7 had the closest genetic relationship with Arthrobacter icotianae. Taken together, the strain XE-7 was identified as A.nicotianae.