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Salinimicrobium terrae sp. nov., isolated from saline soil, and emended description of the genus Salinimicrobium

¹ Yunnan Institute of Microbiology, Yunnan University, Kunming, Yunnan 650091, PR China
² College of Bio-resources and Environmental Science, Jishou University, Jishou, Hunan 416000, PR China
³ Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, PR China
⁴ Korea Research Institute of Bioscience and Biotechnology, 52 Oeundong, Yusong, Daejeon 305-333, Republic of Korea

Correspondence
Xiao-Long Cui
xlcuiynu{at}yahoo.com.cn
or
xlcui{at}ynu.edu.cn

A novel yellow-pigmented, Gram-negative, slightly halophilic, catalase-positive, oxidase-negative, obligately aerobic bacterium, designated strain YIM-C338^T, was isolated from saline soil from the Qaidam Basin in north-west China. Cells were non-sporulating, non-motile, short rods, predominantly occurring singly. Coccoid bodies and slightly curved rod-shaped cells of varying length developed in older cultures. Growth occurred with 0.5–8 % (w/v) NaCl (optimally with 1–3 %, w/v), at pH 6.0–9.0 (optimally at pH 7.0) and at 4–37 °C (optimally at 28 °C). The major cellular fatty acids were C_{16 : 0}, C_{18 : 0}, C_{16 : 1}7c, C_{18 : 1}7c, iso-C_{13 : 0} 3-OH and iso-C_{15 : 1}. MK-6 was the only respiratory quinone. Non-diffusible carotenoid pigments were produced. Flexirubin-type pigments were absent. The genomic DNA G+C content was 42.8 mol%. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain YIM-C338^T was a member of the genus Salinimicrobium, having sequence similarities of 97.3 and 94.0 % with respect to Salinimicrobium xinjiangense BH206^T and Salinimicrobium catena HY1^T. The combination of the phylogenetic data, phenotypic characteristics and chemotaxonomic differences supported the view that strain YIM-C338^T represents a novel species of the genus Salinimicrobium, for which the name Salinimicrobium terrae sp. nov. is proposed. The type strain is YIM-C338^T (=DSM 17865^T =CGMCC 1.6308^T). An emended description of the genus Salinimicrobium is also provided.

A table showing the whole-cell fatty acid compositions (%) of YIM-C338^T and strains of the genus Salinimicrobium is available as supplementary material with the online version of this paper.

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