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1 The Key Laboratory for Microbial Resources of the Ministry of Education 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
A novel halophilic, filamentous, actinomycete strain, designated YIM 90648T, was isolated from a salt lake in Xinjiang Province, north-west China, and subjected to a polyphasic taxonomic study. Optimal growth occurred at 37 °C, pH 7.0–8.0 and 15 % (w/v) NaCl. The aerial mycelium of strain YIM 90648T formed long chains of spores at maturity and the spores were cylindrical with smooth surfaces. Spore chains with pseudosporangia at the end were borne on the substrate mycelium and most spores had wrinkled surfaces. Strain YIM 90648T contained meso-diaminopimelic acid as the diagnostic diamino acid and galactose and ribose as the major whole-cell components. The phospholipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylcholine and phosphatidylinositol mannoside. MK-10(H8), MK-11(H4), MK-11(H6) and MK-11(H8) were the predominant menaquinones. The major fatty acids were i-C16 : 0 and ai-C17 : 0. The DNA G+C content was 68 mol%. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain YIM 90648T formed a distinct lineage within the family Nocardiopsaceae and showed 16S rRNA gene sequence similarity of 93.3–95.0 % with members of the family Nocardiopsaceae. On the basis of the polyphasic evidence, a novel genus and species, Haloactinospora alba gen. nov., sp. nov., is proposed to accommodate this isolate. The type strain of Haloactinospora alba is YIM 90648T (=DSM 45015T =CCTCC AA 206008T).
These authors contributed equally to this work. The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain YIM 90648T is DQ923130.
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