Marinicaulis

Abstract

Ma.ri.ni.cau'lis. L. masc. adj. marinus of the sea; L. masc. n. caulis stalk; N.L. masc. n. Marinicaulis a stalk from the sea. Proteobacteria / Alphaproteobacteria / Parvularculales / Parvularculaceae / Marinicaulis The genus Marinicaulis accommodates mesophilic, neutrophilic, halotolerant, and chemoorganotrophic bacteria. Cells are Gram‐stain‐negative, aerobic or facultatively anaerobic, ovoid or short rod‐shaped with prosthecae or flagella, non‐spore‐forming, and slightly motile with flagella. Growth occurs at pH 5.0–9.0, 4–40°C, and a wide range of NaCl concentrations (0.5–16%). No growth is observed without NaCl. Catalase‐positive or ‐negative and oxidase‐positive. The major isoprenoid quinone is Q‐10. The principal cellular fatty acids (>10%) are: C 16:0 , 11‐methyl C 18:1 ω7 c , and summed feature 3 (C 16:1 ω7 c and/or C 16:1 ω6 c ). Summed feature 8 (C 18:1 ω7 c and/or C 18:1 ω6 c ) presents as major fatty acid in some species. The major polar lipids include phosphatidylglycerol (PG) or phosphatidylethanolamine (PE) and unidentified glycolipids. Marinicaulis species can utilize monosaccharides, oligosaccharides, sugar alcohol, amino acids, and organic acids. Genome features show that Marinicaulis flavus SY‐3‐19 T has putative β‐etherase‐encoding sequences, which is the first report of β‐etherases in the order “ Parvularculales ”, indicating the potential ability to degrade lignin model substrates. The known habitat is seawater. DNA G + C content (mol%) : 58.2–60.9 (genome sequence). Type species : Marinicaulis flavus Yu et al. 2018 VP .