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Virgibacillus kekensis sp. nov., a moderately halophilic bacterium isolated from a salt lake in China

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 DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Inhoffenstraße 7B, D-38124 Braunschweig, Germany
⁴ Environmental Science and Engineering College, Chang'an University, Chang'an, Shanxi 710064, PR China

Correspondence
Li-Hua Xu
lihxu{at}ynu.edu.cn
Xiao-Long Cui
xlcuiynu{at}yahoo.com.cn

A Gram-positive, moderately halophilic, motile, strictly aerobic, endospore-forming, oxidase- and catalase-positive, rod-shaped bacterium, strain YIM kkny16^T, was isolated from a saline mud sample collected from the Keke salt lake in the Qaidam Basin, north-west China. This isolate grew in the presence of 0–25 % (w/v) NaCl and at pH 6.0–10.0 and 10–50 °C; optimum growth was observed with 10 % (w/v) NaCl and at pH 7.0 and 37 °C. Strain YIM kkny16^T had meso-diaminopimelic acid as the diagnostic diamino acid, MK-7 as the predominant respiratory quinone, with a significant amount of MK-6, and anteiso-C_{15 : 0}, iso-C_{14 : 0} and C_{16 : 1}7c alcohol as major fatty acids. Major polar lipids were diphosphatidylglycerol and phosphatidylglycerol. The DNA G+C content was 41.8 mol%. Phylogenetic analysis based on 16S rRNA gene sequences confirmed that strain YIM kkny16^T was a member of the genus Virgibacillus, exhibiting sequence similarities of 94.9–97.3 % to the type strains of recognized Virgibacillus species. Strain YIM kkny16^T could be differentiated from recognized Virgibacillus species based on phenotypic characteristics, chemotaxonomic differences, phylogenetic analysis and DNA–DNA hybridization data. On the basis of evidence from this polyphasic study, strain YIM kkny16^T is considered to represent a novel species of the genus Virgibacillus, for which the name Virgibacillus kekensis sp. nov. is proposed. The type strain is YIM kkny16^T (=DSM 17056^T=CGMCC 1.6298^T).

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