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Streptomyces sedi sp. nov., isolated from surface-sterilized roots of Sedum sp.

¹ The Key Laboratory for Microbial Resources of the Ministry of Education, PR China, and Laboratory for Conservation and Utilization of Bio-Resources, Yunnan Institute of Microbiology, Yunnan University, Kunming 650091, PR China
² Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China

Correspondence
Wen-Jun Li
wjli{at}ynu.edu.cn
or
liact{at}hotmail.com

An endophytic actinomycete, strain YIM 65188^T, was isolated from surface-sterilized tissue of Sedum sp. collected from Yunnan province, south-west China, and characterized by using a polyphasic approach. Analysis of the 16S rRNA gene sequence showed that strain YIM 65188^T is a member of the genus Streptomyces and exhibited 97.5 and 96.3 % gene sequence similarities to Streptomyces specialis GW41-1564^T and Streptomyces hainanensis YIM 47672^T, respectively, whereas low sequence similarity values (<95.2 %) distinguished strain YIM 65188^T from all other Streptomyces species with validly published names. Strain YIM 65188^T had a unique menaquinone composition, with the predominant quinones being MK-11(H₆) and MK-10(H₆), with moderate amounts of MK-10(H₈), MK-11(H₈), MK-9(H₈), MK-11(H₄), MK-9(H₆) and MK-10(H₄). Similarly, the closest phylogenetic relative, S. specialis GW41-1564^T, also had an unusual quinone composition, with the predominant menaquinones MK-10(H₄) and MK-10(H₆) and minor amounts of MK-9(H₄) and MK-9(H₆). The DNA–DNA hybridization value between strain YIM 65188^T and S. specialis GW41-1564^T was 42.7 %. On the basis of phenotypic and phylogenetic characteristics, strain YIM 65188^T was identified as a novel species of the genus Streptomyces for which the name Streptomyces sedi sp. nov. is proposed, with YIM 65188^T (=CCTCC AA 208020^T =DSM 41942^T) as the type strain.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain YIM 65188^T is EU925562.

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