Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Ramlibacter terrae sp. nov. and Ramlibacter montanisoli sp. nov., Isolated from Soil

  • Received : 2021.05.18
  • Accepted : 2021.07.19
  • Published : 2021.09.28
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Abstract

Two gram-negative, catalase-positive, strictly aerobic, and white colony-forming bacteria, strains H242T and B156T, were isolated from soil in South Korea. Cells of strain H242T were oxidase-positive and non-motile short rods, while those of strain B156T were oxidase-negative and long non-motile rods. Ubiquinone-8 was identified as the sole isoprenoid quinone in both strains. C16:0, cyclo-C17:0, andsummed feature 3 (C16:1 ω7c and/or C16:1 ω6c) and phosphatidylethanolamine, phosphatidylglycerol, and diphosphatidylglycerol were identified in both strains as the major cellular fatty acids and polar lipids, respectively. The DNA G+C contents of strains H242T and B156T were 69.4 mol% and 69.3 mol%, respectively. Phylogenetic analyses based on 16S rRNA and 92 concatenated core gene sequences revealed that strains H242T and B156T formed distinct phylogenic lineages from other Ramlibacter type strains. The DNA-DNA hybridization (DDH) value between strains H242T and B156T was 24.6%. Strains H242T and B156T were most closely related to Ramlibacter ginsenosidimutans BXN5-27T and Ramlibacter monticola G-3-2T with 98.4% and 98.6% 16S rRNA gene sequence similarities, respectively. Digital DDH values between strain H242T and R. ginsenosidimutans and between strain B156T and R. monticola were 23.5% and 26.1%, respectively. Phenotypic, chemotaxonomic, and molecular analyses indicated that strains H242T and B156T represent two novel species of the genus Ramlibacter, for which the names Ramlibacter terrae sp. nov. and Ramlibacter montanisoli sp. nov., respectively, are proposed. The type strains of R. terrae and R. montanisoli are H242T (=KACC 21667T=JCM 33922T) and B156T (=KACC 21665T=JCM 33920T), respectively.

Keywords

Acknowledgement

We thank Prof. Aharon Oren for his expert suggestion for correct species epithet and Latin etymology. This work was supported by the Program for Collection of Domestic Biological Resources from the National Institute of Biological Resources (NIBR No. 2020-02-001) of the Ministry of Environment (MOE) and the National Research Foundation (2017M3C1B5019250) of the Ministry of Science and ICT, Republic of Korea.

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