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Genomic and polyphasic characterization of Halomonas salsilacus sp. nov., moderately halophilic bacterium isolated from saline lake sediment
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DOI：10.1016/j.syapm.2026.126700.png)
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Abstract
En 中文
Strains MA07–2T and RA08–2 were Gram-negative, moderately halophilic, facultatively anaerobic, coccoid or short rod-shaped bacteria isolated from saline lake sediments in the Ngari Prefecture, Xizang Autonomous Region, China. Strain MA07–2T shared 99.9% similarity of 16S rRNA gene sequence with strain RA08–2. The digital DNA-DNA hybridization and average nucleotide identity values between strain MA07–2T and RA08–2 were 94.9% and 99.11%, respectively, indicating that strains MA07–2T and RA08–2 belong to the same species. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strains MA07–2T and RA08–2 belong to the genus Halomonas, with sharing the highest sequence similarity (98.0%) with Halomonas tibetensis pyc13T. Whole-genome phylogenetic analysis further supported their novel species status, exhibiting average nucleotide identity and digital DNA-DNA hybridization values of 86.23% and 32.0%, respectively, with the closest related species Halomonas tibetensis KCTC 52660T, both of which were below the established thresholds for species delineation. The major cellular fatty acids were C18:1 ω7c, C16:1 ω7c and C16:0, with Q-9 being the predominant respiratory quinone. The polar lipid profile comprised diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine and three unidentified phospholipids. Based on genomic, phylogenetic, phenotypic, and chemotaxonomic evidence, strains MA07–2T and RA08–2 represent a novel species of the genus Halomonas, for which the name Halomonas salsilacus sp. nov. is proposed. The type strain is MA07–2T (= MCCC 1K10020T = KCTC 18247T).
Keywords:
Halomonas salsilacus
moderately halophilic
16S rRNA gene
phylogenetic analysis
genomic characterization
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