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Taxonomic study of neutrotolerant acidophilic actinomycetes isolated from soil and description of Streptomyces yeochonensis sp. nov.

¹ Korean Collection for Type Cultures, Korea Research Institute of Bioscience and Biotechnology, 52 Oun Dong, Yusong, Daejon 305-333, Republic of Korea
² School of Biology, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK
³ Division of Biological Sciences, College of Natural Sciences, Sunchon National University, Sunchon 540-742, Republic of Korea

Correspondence
Seung Bum Kim
sbk01{at}kribb.re.kr

Acidophilic actinomycete strains that represent the two major neutrotolerant clusters defined by numerical taxonomy (Seong, 1992) were the subject of a polyphasic taxonomic study. The centrotypes of each cluster, designated as strain JL164 (=KCTC 9924) of cluster 21 and strain CN732^T (=KCTC 9926^T=IMSNU 50114^T=NRRL B-24245^T) of cluster 13, were assigned initially to the genus Streptomyces on the basis of morphological and chemotaxonomic characteristics; this assignation was confirmed by 16S rRNA gene sequence data. Strain CN732^T formed a distinct phyletic line within the Streptomyces tree, whereas strain JL164 was related closely to the type strain of Streptomyces mirabilis. It is evident from the present and previous studies that neutrotolerant acidophilic actinomycetes comprise taxonomically diverse groups within the variation encompassed by the genus Streptomyces. It is also apparent that strain CN732^T and other members of cluster 13 merit recognition as a novel species, for which the name Streptomyces yeochonensis sp. nov. is proposed.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains JL164 and CN732^T are AF101414 and AF101415, respectively.

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