Title Psychroflexus lacisalsi sp. nov., a Moderate Halophilic Bacterium Isolated from a Hypersaline Lake (Hunazoko-Ike) in Antarctica
Author Hongyan Zhang1, Shoko Hosoi-Tanabe1* Shinichi Nagata1, Syuhei Ban2, and Satoshi Imura3
Address 1Research Center for Inland Seas, Kobe University, Kobe 658-0022, Japan, 2The University of Shiga Prefecture, Shiga 522-8533, Japan, 3National Institute of Polar Research, Tokyo 190-8518, Japan
Bibliography Journal of Microbiology, 48(2),160-164, 2010,
Key Words Psychroflexus lacisalsi sp. nov., novel bacterium, 16S rRNA gene, psychrotolerant, Antarctica
Abstract A novel Gram-negative, aerobic, moderate halophilic, and psychrotolerant bacterium, designated as strain H7T, was isolated from a hypersaline lake located in Skarvsnes, Antarctica. Cells were filaments with varying lengths. Coccoid bodies developed in old cultures. Growth occurred with 0.5-15% (w/v) NaCl (optimum, 5.8-7.0%), at pH 6.0-10.0 (optimum, pH 7.0-8.0), and at 10-28°C (optimum, 25°C). The strain had a G+C content of 34.9 mol%, which is within the range of 32-36 mol% reported for the genus Psychroflexus. Chemotaxonomic data (major respiratory quinone: MK-6; major fatty acids: aC15:0, iC16:0 3-OH, and aC15: 1 A) supported the classification of strain H7T within the genus Psychroflexus. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain H7T should be assigned to the genus Psychroflexus and has a homology with Psychroflexus salinarum (98.2%), P. sediminis (96.1%), P. torquis (95.2%), P. tropicus (95.8%), and P. gondwanense (92.2%). Strain H7 is not identified as P. salinarum because that DNA-DNA hybridization data were 8.5% between strain H7T and P. salinarum. The combination of phylogenetic analysis, DNA-DNA hybridization data, phenotypic characteristics, and chemotaxonomic differences supported the view that strain H7T represents a novel species of the genus Psychroflexus. The name Psychroflexus lacisalsi is proposed, and the type strain is H7T (=JCM 16231T =KACC 14089T).