关键词: 黑胡桃链霉菌, 链霉菌45#, 抑菌活性 , 分类鉴定

Abstract: The Streptomyces strain 45#, which was isolated from soil, can produce broadspectrum antimicrobial substances with high activities. Analysis on these antimicrobial substances showed that they have notable antagonistic effects on phytopathogens as well as some bacteria, but unconspicuous effects on fungi comparatively. A similarity of basic properties between Streptomyces strain 45# and Streptomyces nogalater was proved by a series of comparison of the morphological and cultural characteristics, and the physiological and biochemical properties. The results exhibited that the homology of 16S rDNA between these two strains reached 99%. A phylogenetic tree was constructed by comparing with some correlative published 16S rDNA sequences. According to the multiclassification principle and the phylogenetic analysis, the Streptomyces strain 45# should be nomenclatured as Streptomyces nogalater.

Key words: antimicrobial activity , classification and identification, Streptomyces strain 45#, Streptomyces nogalater