Four novel Pseudoalteromonas species isolated from seawater: Pseudoalteromonas mucoides sp. nov., Pseudoalteromonas aquimarina sp. nov., Pseudoalteromonas maris sp. nov. and Pseudoalteromonas thalassia sp. nov.

초록

Four novel marine bacteria, ZZD1T, SSM20T, SSDWG2T and SSMSWG5T, were collected from seawater at Jajakdo and Minmeoru Beaches, Republic of Korea. The cells of these strains were Gram-stain-negative and rod-shaped. Strains ZZD1T, SSM20T, SSDWG2T and SSMSWG5T had the highest 16S rRNA gene sequence similarity to Pseudoalteromonas carrageenovora IAM 12662T (16S rRNA gene sequence similarity, 99.1%), Pseudoalteromonas spongiae UST010723-006T (99.2%), Pseudoalteromonas caenipelagi JBTF-M23T (98.4%) and Pseudoalteromonas shioyasakiensis SE3T (99.2%), respectively. Polyphasic and phylogenetic analyses confirmed that the four strains were closely related to the genus Pseudoalteromonas. The digital DNA–DNA hybridization values ranged from 18.9 to 22.2% for ZZD1T, 19.1 to 26.0% for SSM20T, 19.7 to 22.8% for SSDWG2T and 19.7 to 34.5% for SSMSWG5T. All values were thus below the 70% threshold, indicating distinct genomic differences between the strains. In addition, the average nucleotide identity and average amino acid identity of ZZD1T, SSM20T, SSDWG2T and SSMSWG5T with other species of the genus Pseudoalteromonas included in the phylogenetic analysis were 66.6–93.1% and 70.4–88.2%, respectively. Collectively, these results confirmed that the four strains represented new species within the genus Pseudoalteromonas. Based on these findings, the strains were classified as Pseudoalteromonas mucoides sp. nov. (type strain ZZD1T=KACC 23717T=TBRC 19020T), Pseudoalteromonas aquimarina sp. nov. (type strain SSM20T=KACC 23718T=TBRC 19019T), Pseudoalteromonas maris sp. nov. (type strain SSDWG2T=KACC 23719T=TBRC 19021T) and Pseudoalteromonas thalassia sp. nov. (type strain SSMSWG5T=KACC 23734T=TBRC 19022T). © 2026 The Authors.

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