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Streptomonospora halophila sp. nov., a halophilic actinomycete isolated from a hypersaline soil

Man Cai^1,, Xiao-Yang Zhi^1,, Shu-Kun Tang¹, Yu-Qin Zhang^1,2, Li-Hua Xu¹ and Wen-Jun Li¹

¹ The Key Laboratory for Microbial Resources of the Ministry of Education, Laboratory for Conservation and Utilization of Bio-Resources, Yunnan Institute of Microbiology, Yunnan University, Kunming 650091, PR China
² Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, PR China

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

An actinomycete strain, designated YIM 91355^T, was isolated from a soil sample collected from a hypersaline soil in Xinjiang Province, China, and its taxonomic position was investigated by using a polyphasic approach. The strain grew well on most media tested and no diffusible pigment was produced. The aerial mycelium of this organism was well developed but not fragmented and, at maturity, formed short chains of spores. Substrate mycelium was branched with non-fragmenting hyphae and single, oval to round spores were formed, borne on sporophores. Strain YIM 91355^T contained meso-diaminopimelic acid as the diagnostic amino acid. The purified cell-wall hydrolysate contained galactose. The predominant menaquinones were MK-10(H₈) (43.2 %), MK-10(H₆) (17.7 %) and MK-11(H₈) (10.4 %). Phospholipids were phosphatidylglycerol, diphosphatidylglycerol, phosphatidylinositol mannosides, phosphatidylcholine, phosphatidylinositol and an unidentified phospholipid. The major fatty acids were i-C_{16 : 0}, ai-C_{17 : 0}, 10-methyl C_{17 : 0} and 10-methyl C_{18 : 0}. The G+C content of the genomic DNA was 72.1 mol%. Phylogenetic analysis indicated that the isolate belongs to the genus Streptomonospora of the family Nocardiopsaceae. Based on phenotypic and genotypic data, it is concluded that strain YIM 91355^T represents a novel species of the genus Streptomonospora, for which the name Streptomonospora halophila sp. nov. (type strain YIM 91355^T =DSM 45075^T =KCTC 19236^T) is proposed.

These authors contributed equally to this work.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain YIM 91355^T is EF423989.

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