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Abstract

Two Gram-stain-negative bacterial strains, 15-R06ZXC-3 and R06B22, were isolated from the surface sediment of the Arctic Ocean. Phylogenetic analyses based on the 16S rRNA gene and genome sequences indicated that strain 15-R06ZXC-3 belongs to the genus , while strain R06B22 belongs to the genus . Strain 15-R06ZXC-3 showed the closest relationship to DT23-4. The digital DNA–DNA hybridization (dDDH) and average nucleotide identity (ANI) values between strain 15-R06ZXC-3 and all of the type strains of the genus ranged from 20.8 to 30.4% and 79.1 to 85.7%, respectively. Strain R06B22 was most closely related to DSW25-10. The dDDH and ANI values between strain R06B22 and all of the type strains of the genus ranged from 18.6 to 20.4% and 77.5 to 79.4%, respectively. These dDDH and ANI values were all below the standard cutoff criteria for the delineation of bacterial species, indicating that the two strains may represent novel species within their respective genera. Furthermore, their phenotypic and chemotaxonomic characteristics also differentiated them from closely related species. Based on the polyphasic analyses, strains 15-R06ZXC-3 and R06B22 separately represent novel species of the genera and , for which the names sp. nov. (type strain 15-R06ZXC-3 = MCCC 1A07434= KCTC 8342) and sp. nov. (type strain R06B22 = MCCC 1A08273= KCTC 8343) are proposed. Additionally, phylogenomic analyses showed that the strain ZX-21 was clustered with the strain DSW25-10 and all other type strains of the genus . Furthermore, the ANI and dDDH values between strains ZX-21 and DSW25-10 were 97.6% and 78.8±2.5%, respectively, strongly indicating that they represented a single species. Therefore, it is proposed that Yu 2019 be recognized as a later heterotypic synonym of On 2019.

Funding
This study was supported by the:
  • National Microbial Resource Center (Award NMRC-2024-9)
    • Principle Award Recipient: ZongzeShao
  • National Science and Technology Fundamental Resources Investigation Program of China (Award 2021FY100900)
    • Principle Award Recipient: QiliangLai
  • Scientific Research Foundation of Third Institute of Oceanography, MNR (Award 2019021)
    • Principle Award Recipient: ZongzeShao
  • Scientific Research Foundation of Third Institute of Oceanography, MNR (Award 2020009)
    • Principle Award Recipient: ChunmingDong
  • National Key Research and Development Program (Award 2022YFC2807501)
    • Principle Award Recipient: ChunmingDong
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2024-10-16
2024-11-10
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