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

Volume 75, Issue 2

Isolation and characterization of sp. nov. and sp. nov. isolated from freshwater No Access

Abstract

Two novel Gram-stain-negative, aerobic, heterotrophic, non-motile bacterial strains, designated as AS3R-12 and PS1R-30, were isolated from freshwater in South Korea. To determine their taxonomic positions, the strains were thoroughly characterized. Genomic analyses, based on 16S rRNA gene and draft genome sequence data, revealed that the two novel isolates, AS3R-12 and PS1R-30, belonged to the genus . AS3R-12 showed the highest 16S rRNA gene similarity (97.7%) with UCT-28. In addition, PS1R-30 showed 97.9% 16S rRNA gene similarity with NBRC 107847. The draft genome of strains AS3R-12 and PS1R-30 consisted of 4 149 275 and 4 969 838 bps, with DNA G+C content of 63.1 and 66.1 mol%, respectively. The average nucleotide identity between two strains and other related species was below 76.2%, and the digital DNA–DNA hybridization values with closely related species were below 20.8%, both lower than the species delineation threshold. Strains AS3R-12 and PS1R-30 contained the ubiquinone Q-10 as the major quinone and displayed a polyamine pattern with spermidine as the predominant polyamine. Additionally, their major fatty acids were characterized by C /C (summed feature 3) and C /C (summed feature 8). The major polar lipids of AS3R-12 and PS1R-30 were diphosphatidylglycerol (DPG), phosphatidylglycerol (PG), phosphatidylethanolamine (PE), sphingoglycolipid (SGL) and phosphatidylcholine (PC). Moreover, physiological and biochemical results allowed the phenotypic and genotypic differentiation of strains AS3R-12 and PS1R-30 from their closest and other species of the genus with validly published names. Therefore, AS3R-12 and PS1R-30 represented novel species of the genus , for which the names sp. nov. (type strain AS3R-12=KACC 23096=LMG 32950) and sp. nov. (type strain PS1R-30=KACC 23097=LMG 32951) are proposed.

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Keyword(s): Novosphingobium aquae sp. nov. , Novosphingobium anseongense sp. nov. and polyphasic taxonomy
Funding
This study was supported by the:
  • Nakdonggang National Institute of Biological Resources (Award NNIBR202201101)
    • Principal Award Recipient: Wan-TaekIm
© 2025 The Authors
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Isolation and characterization of Novosphingobium aquae sp. nov. and Novosphingobium anseongense sp. nov., isolated from freshwater
Int J Syst Evol Microbiol 75, 006688 (2025); https://doi.org/10.1099/ijsem.0.006688
/content/journal/ijsem/10.1099/ijsem.0.006688
/content/journal/ijsem/10.1099/ijsem.0.006688
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