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Isoptericola halotolerans sp. nov., a novel actinobacterium isolated from saline soil from Qinghai Province, north-west China

¹ The Key Laboratory for Microbial Resources of Ministry of Education, Yunnan Institute of Microbiology, Yunnan University, Kunming, Yunnan, 650091, People's Republic of China
² Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, People's Republic of China
³ DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Mascheroder Weg 1b, D-38124 Braunschweig, Germany

Correspondence
Wen-Jun Li
wjli{at}ynu.edu.cn or
lihxu{at}ynu.edu.cn

A Gram-positive, non-motile actinobacterium, designated strain YIM 70177^T, was isolated from a saline soil sample from Qinghai Province, north-west China. Phylogenetic analysis of this organism based on 16S rRNA gene sequences revealed 98·3 % similarity to Isoptericola variabilis DSM 10177^T. Chemotaxonomic data determined for the isolate, such as the peptidoglycan type A4, variation L-lys–D-Asp, supported the placement of strain YIM 70177^T within the genus Isoptericola. Galactose was detected as cell wall sugar. Phospholipids identified were phosphatidylinositol, phosphatidylglycerol and diphosphatidylglycerol, and the predominant menaquinones were MK-9(H₄) and MK-9(H₂). The major fatty acids were ai-C_{15 : 0}, C_{16 : 0}, ai-C_{17 : 0} and i-C_{15 : 0}. The DNA G+C content was 72·8 mol%. The low level of DNA–DNA relatedness (27·4 %) to I. variabilis DSM 10177^T in combination with differentiating chemotaxonomic and physiological data demonstrated that the isolate YIM 70177^T should be classified as representing a novel species of the genus Isoptericola. The name Isoptericola halotolerans sp. nov. is proposed, with strain YIM 70177^T (=DSM 16376^T=KCTC 19046^T) as the type strain.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain YIM 70177^T is AY789835.

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