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Roseovarius tibetensis sp. nov., a halophilic bacterium isolated from Lake LongmuCo on Tibetan Plateau

  • Microbial Systematics and Evolutionary Microbiology
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Abstract

Two Gram-stain negative halophilic strains, designated as LM2T and LM4, were isolated from Lake LongmuCo on Tibetan Plateau. These two strains were aerobic, catalaseand oxidase-positive, nonmotile and rod-shaped organisms. Phylogenetic analysis based on 16S rRNA gene sequences indicated that LM2T and LM4 belong to the genus Roseovarius, with Roseovarius tolerans EL-172T (97.3% and 97.4% 16S rRNA gene sequence similarity, respectively) and Roseovarius azorensis SSW084T (95.5% and 95.6% 16S rRNA gene sequence similarity, respectively) as their closest neighbors. Q-10 was the sole respiratory quinone of these two strains. The major fatty acids were C18:1ω7c/C18:1ω6c, C16:0, C19:0 cyclo ω8c, and 11-methyl C18:1ω7c. The polar lipids included phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylcholine, phospholipid of unknown structure containing glucosamine, and unidentified aminolipid. The DNA G + C content was between 64.2 and 64.5 mol%. DNA-DNA hybridization showed 96.7% relatedness between LM2T and LM4, 24.9% relatedness between LM2T and R. tolerans EL-172T, and 36.3% relatedness between LM4 and R. tolerans EL-172T. Based on phylogenetic analysis, DNA-DNA hybridization, a range of physiological and biochemical characteristics, LM2T and LM4 belong to the same species and were clearly distinguished from the type strains of the genus Roseovarius. It was evident that LM2T and LM4 could be classified as a novel species of the genus Roseovarius, for which the name Roseovarius tibetensis sp. nov. is proposed. The type strain is LM2T (= CGMCC 1.16230T = KCTC 62028T).

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Authors and Affiliations

  1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, P. R. China

    Hui-bin Lu, Peng Xing & Qing-long Wu

  2. University of Chinese Academy of Sciences, Beijing, 100049, P. R. China

    Hui-bin Lu

  3. Nanjing Normal University, Nanjing, 210046, P. R. China

    Xiao-feng Xue

  4. Tibet Plateau Institute of Biology, Lhasa, 850000, P. R. China

    Dorji Phurbu

  5. Sino-Danish Centre for Education and Research, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China

    Qing-long Wu

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  1. Hui-bin Lu
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  2. Xiao-feng Xue
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  3. Dorji Phurbu
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  4. Peng Xing
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  5. Qing-long Wu
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Correspondence to Peng Xing.

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Lu, Hb., Xue, Xf., Phurbu, D. et al. Roseovarius tibetensis sp. nov., a halophilic bacterium isolated from Lake LongmuCo on Tibetan Plateau. J Microbiol. 56, 783–789 (2018). https://doi.org/10.1007/s12275-018-8178-0

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