Halomonas xinjiangensis sp. nov., a halotolerant bacterium isolated from a salt lake

Author:

Guan Tong-Wei1,Xiao Jing2,Zhao Ke31,Luo Xiao-Xia1,Zhang Xiao-Ping3,Zhang Li-Li1

Affiliation:

1. Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin of Xinjiang Production and Construction Corps, Tarim University, Alar, Xinjiang 843300, PR China

2. Key Laboratory of Marine Biological Resources, Third Institute of Oceanography, State Oceanic Administration, Xiamen, Fujian 361005, PR China

3. Faculty of Resource and Environmental Sciences, Sichuan Agricultural University, Yaan 625000, PR China

Abstract

A novel bacterium, TRM 0175T, belonging to the genus Halomonas, was isolated from a soil sample taken from a salt lake in Xinjiang Province, north-west China. The isolate was Gram-negative, aerobic, rod-shaped and motile by means of peritrichous flagella. It was catalase-positive and oxidase-negative. Growth occurred at NaCl concentrations of 0–20 % (optimum at 10–13 %), at 15–50 °C (optimum at 37 °C) and at pH 6.0–9.0 (optimum at pH 7.0). Metabolism was respiratory with oxygen as terminal electron acceptor. Acid was produced from d-ribose, d- and l-arabinose, d-xylose, d-galactose, d-mannose, l-rhamnose, cellobiose, maltose, trehalose and d- and l-fucose and was produced weakly from aesculin. The predominant ubiquinone was Q-9. The major fatty acids were C18 : 1 ω7c and C19 : 0 cyclo ω8c. The G+C content of the genomic DNA was 60.0 mol%. The affiliation of strain TRM 0175T with the genus Halomonas was confirmed by 16S rRNA gene sequence comparisons. The most closely related species was Halomonas anticariensis; 16S rRNA gene sequence similarity between H. anticariensis FP35T and strain TRM 0175T was 95.3 %. Phenotypically, some characteristics of TRM 0175T differed from those of H. anticariensis. On the basis of data from this polyphasic study, strain TRM 0175T represents a novel species of the genus Halomonas, for which the name Halomonas xinjiangensis sp. nov. is proposed; the type strain is TRM 0175T (=CCTCC AB 208329T =KCTC 22608T).

Publisher

Microbiology Society

Subject

General Medicine,Ecology, Evolution, Behavior and Systematics,Microbiology

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