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초록

A novel bacterial strain, MJW-29T, was isolated from tidal flat sediment in Gochang, Republic of Korea. The isolate is Gram-stain-negative, facultatively anaerobic, gliding motile and short rods. The strain MJW-29T is oxidase and catalase positive. Growth is observed at 25–40 °C (optimum, 30 °C) and pH 5–9 (optimum, pH 7.0) in the presence of 0–9% (w/v) NaCl (optimum, 5.0% NaCl). The 16S rRNA gene sequence identity analysis showed that the strain MJW-29T is closely associated with Tatey-amaria armeniaca KMU-156T (97.2%), Sulfitobacter alexandrii AM1-D1T (97.2%), Sulfitobacter sediminilitoris JBTF-M27T (97.0%) and Thalassovita litoraria KU5D5T (96.9%) from the family Roseobacteraceae. The major respiratory quinone was Q-10. The major polar lipids were phosphatidylglycerol, phosphatidylcholine, phospholipid and an unidentified lipid. The major cellular fatty acids of type strain MJW-29T were C18:1 ω7c/C18:1 ω6c (64.5%). The genome length of the type strain MJW-29T is 4.9 Mbp (DNA G+C content, 62.1 mol%). It has 4638 coding genes and 43 tRNAs. The average aa identity values; average nt identity values; and biochemical, phylogenetic and physiological characteristics support the genotypic and phenotypic differentiation of strain MJW-29T from other members of the genus Sulfitobacter. The strain MJW-29T represents a novel species of the genus Sulfitobacter in the family Roseobacteraceae, for which the name Sulfitobacter sediminis sp. nov. is proposed. The type strain is MJW-29T (=KCTC 8634T=KEMB 20189T=JCM 37145T). © 2025 The Authors.

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