链霉菌属菌株AS4.693和AS4.702的分类学研究

链霉菌属“Setae”种群原为北里孢菌属Kitasatosporia (Omura,1982)。1992年,Wellington根据16S rRNA序列分析结果将其并入链霉菌属,并建立“Setae”种群。通过对保藏的链霉菌AS 4.693、AS 4.702进行的形态学、细胞化学、分子遗传分类研究结果表明,它们与链霉菌属“Setae”种群中的典型种——西唐链霉菌Streptomyces setae(JCM3304’)具有相似性。它们的rDNA相似性高达100％,证明它们应归属于同一种群。AS.4.693定名为西唐链霉菌不规则新亚种Streptomyces setae subsp.irregularis nov.,AS 4.702定名为西唐链霉菌波曲弗氏新亚种Streptomyces setae subsp.flexuofradiae nov.。

TAXONOMIC STUDIES OF TWO STREPTOMYCETE STRAINS AS 4.693 AND AS 4.702

The "setae group" of the genus Streptomyces was originally the genus Kitasatosporia (Omura, 1982). On the basis of 16s rRNA analysis, Wellington(1992) proposed to reduce Kitasatosporia to synonymy with Streptomyces as a species group--"setae group". Two Streptomyces strains, AS 4.693 and AS 4.702(deposited in CCCCM) were examined by using morphological, chemical and nucleic acid ribtyping methods. It was revealed that these two strains have similarity to the type strain Streptomyces setae JCM3304T, and they share 100% DNA homology with JCM 3304T. Therefore, we propose that the strain AS 4.693 be transferred to the "setae group" of genus Streptomyces as Streptomyces setae subsp. irregularis nov. and the strain AS 4.702 as Streptomyces setae subsp. flexuofradiae nov.