{"title":"<i>Alteromonas algae</i> sp. nov. and <i>Alteromonas ulvae</i> sp. nov., isolated from the seaweed <i>Ulva prolifera</i> dominating green tides in the Yellow Sea.","authors":"Xiaojing Lv, Jin Zhao, Peng Jiang","doi":"10.1099/ijsem.0.006925","DOIUrl":null,"url":null,"abstract":"<p><p>Strains A079<sup>T</sup> and A081<sup>T</sup> were isolated from the floating seaweed <i>Ulva prolifera</i>, which is the dominant species of the world's largest green tides in the Yellow Sea. Both strains were Gram-stain-negative, aerobic and motile via a single polar flagellum. The major fatty acids of the two strains were C<sub>16:0</sub>, C<sub>17:1</sub> ω8c, C<sub>18:1</sub> ω7c and summed feature 3 (C<sub>16:1</sub> ω7c and/or C<sub>16:1</sub> ω6c). Cells of the strain A079<sup>T</sup> were oval or short rod-shaped. Cells of the strain A081<sup>T</sup> were rod-shaped. A079<sup>T</sup> grew at 10-37 °C, pH 6.0-10.0 and 1-12% (w/v) NaCl. A081<sup>T</sup> grew at 10-40 °C, pH 6.0-11.0 and 1-12% (w/v) NaCl. Phylogenetic analyses based on 16S rRNA genes and whole-genome sequences revealed that strains A079<sup>T</sup> and A081<sup>T</sup> belong to the genus <i>Alteromonas</i>. The average nucleotide identity and digital DNA-DNA hybridization values between strains A079<sup>T</sup>, A081<sup>T</sup> and related <i>Alteromonas</i> species ranged from 68.98 to 88.75% and 20.40 to 36.40%, respectively. Comparative genomic analysis discovered that A079<sup>T</sup> possessed a unique RiPP-like (TP-1161) cluster. Strain A089<sup>T</sup> exhibited the potential to utilize ulvan, and an acyl-homoserine lactone synthesis gene cluster was predicted in the strain. These findings reveal possible mechanisms for phycosphere adaptation. Phenotypic, chemotaxonomic, phylogenetic and genomic evidence support that strains A079<sup>T</sup> and A081<sup>T</sup> represent two novel species of the genus <i>Alteromonas</i>, for which the names <i>Alteromonas algae</i> sp. nov. (type strain A079<sup>T</sup>=MCCC 1K09912<sup>T</sup>=KCTC 18157<sup>T</sup>) and <i>Alteromonas ulvae</i> sp. nov. (type strain A081<sup>T</sup>=MCCC 1K09913<sup>T</sup>=KCTC 18158<sup>T</sup>) are proposed.</p>","PeriodicalId":14390,"journal":{"name":"International journal of systematic and evolutionary microbiology","volume":"75 10","pages":""},"PeriodicalIF":2.0000,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International journal of systematic and evolutionary microbiology","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1099/ijsem.0.006925","RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MICROBIOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Strains A079T and A081T were isolated from the floating seaweed Ulva prolifera, which is the dominant species of the world's largest green tides in the Yellow Sea. Both strains were Gram-stain-negative, aerobic and motile via a single polar flagellum. The major fatty acids of the two strains were C16:0, C17:1 ω8c, C18:1 ω7c and summed feature 3 (C16:1 ω7c and/or C16:1 ω6c). Cells of the strain A079T were oval or short rod-shaped. Cells of the strain A081T were rod-shaped. A079T grew at 10-37 °C, pH 6.0-10.0 and 1-12% (w/v) NaCl. A081T grew at 10-40 °C, pH 6.0-11.0 and 1-12% (w/v) NaCl. Phylogenetic analyses based on 16S rRNA genes and whole-genome sequences revealed that strains A079T and A081T belong to the genus Alteromonas. The average nucleotide identity and digital DNA-DNA hybridization values between strains A079T, A081T and related Alteromonas species ranged from 68.98 to 88.75% and 20.40 to 36.40%, respectively. Comparative genomic analysis discovered that A079T possessed a unique RiPP-like (TP-1161) cluster. Strain A089T exhibited the potential to utilize ulvan, and an acyl-homoserine lactone synthesis gene cluster was predicted in the strain. These findings reveal possible mechanisms for phycosphere adaptation. Phenotypic, chemotaxonomic, phylogenetic and genomic evidence support that strains A079T and A081T represent two novel species of the genus Alteromonas, for which the names Alteromonas algae sp. nov. (type strain A079T=MCCC 1K09912T=KCTC 18157T) and Alteromonas ulvae sp. nov. (type strain A081T=MCCC 1K09913T=KCTC 18158T) are proposed.
期刊介绍:
Published by the Microbiology Society and owned by the International Committee on Systematics of Prokaryotes (ICSP), a committee of the Bacteriology and Applied Microbiology Division of the International Union of Microbiological Societies, International Journal of Systematic and Evolutionary Microbiology is the leading forum for the publication of novel microbial taxa and the ICSP’s official journal of record for prokaryotic names.
The journal welcomes high-quality research on all aspects of microbial evolution, phylogenetics and systematics, encouraging submissions on all prokaryotes, yeasts, microfungi, protozoa and microalgae across the full breadth of systematics including:
Identification, characterisation and culture preservation
Microbial evolution and biodiversity
Molecular environmental work with strong taxonomic or evolutionary content
Nomenclature
Taxonomy and phylogenetics.