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INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY logo International Journal of Systematic and Evolutionary Microbiology

Volume 75, Issue 3

Description of sp. nov., isolated from deep seawater of the Amundsen Sea (Antarctica), and reclassification of Liu . 2022 as a later heterotypic synonym of Tareen . 2022 No Access

Abstract

Gram-stain-negative, aerobic, rod-shaped bacterial strains, designated HL-TH1 and HL-TH5, were isolated from deep seawater (1127 m depth) of the Amundsen Sea, Antarctica. Phylogenetic analyses based on the 16S rRNA gene sequence revealed that strains HL-TH1 and HL-TH5 were members of the genus with close relatives GH25 (99.3%), NZ-96 (99.3%), G39 (99.1%) and RE35F/1 (98.8%). The complete genome sequences of strains HL-TH1 and HL-TH5 comprised a chromosome of 3.2 Mbp and a plasmid of 0.1 Mbp, with DNA G+C content of 64.1%. The whole genome-based comparisons using the average nt identity and digital DNA–DNA hybridization values revealed that both strains belonged to the same genomic species but were clearly discriminated (79.4–85.8% and 21.9–29.3%, respectively) from their close relatives in the genus . Both strains showed optimal growth at 30 °C, pH 6.5–7.0 and 1.5–2.5% sea salts. The major fatty acids of both strains were C 6 and/or C 7 (37.8–38.4%), C 6 (18.1–19.7%) and C 6 and/or C 7 (12.3–16.7%). The major isoprenoid quinone was ubiquinone-10. The polar lipids consisted of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, phosphatidylcholine and two unidentified lipids. Hence, we propose that strains HL-TH1 and HL-TH5 are assigned to a novel species belonging to the genus , for which the name sp. nov. is proposed. The type strain is HL-TH1 (=KCCM 90517=JCM 36585). In addition, GH25 and NZ-96 were found to be the same species based on a polyphasic approach. Therefore, we propose the reclassification of as a later heterotypic synonym of .

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): deep sea , heterotypic synonym , new species , Qipengyuania profunda and reclassification
Funding
This study was supported by the:
  • Korea Institute of Marine Science and Technology promotion (Award RS-2023-00239449)
    • Principal Award Recipient: BoMin Lee
  • Korea Institute of Marine Science and Technology promotion (Award RS-2023-00256677)
    • Principal Award Recipient: BoMin Lee
© 2025 The Authors
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2026-01-25

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Description of Qipengyuania profunda sp. nov., isolated from deep seawater of the Amundsen Sea (Antarctica), and reclassification of Qipengyuania aerophila Liu et al. 2022 as a later heterotypic synonym of Qipengyuania pacifica Tareen et al. 2022
Int J Syst Evol Microbiol 75, 006713 (2025); https://doi.org/10.1099/ijsem.0.006713
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