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  • Title: Marinobacter aromaticivorans sp. nov., a polycyclic aromatic hydrocarbon-degrading bacterium isolated from sea sediment.
    Author: Cui Z, Gao W, Xu G, Luan X, Li Q, Yin X, Huang D, Zheng L.
    Journal: Int J Syst Evol Microbiol; 2016 Jan; 66(1):353-359. PubMed ID: 26518711.
    Abstract:
    A rod-shaped, Gram-stain-negative, slightly halotolerant bacterium, designated strain D15-8PT, was isolated from a sediment sample from the South China Sea. The strain could grow in NaCl concentrations ranging from 0.5 % to 10 % (w/v) (optimum 0.5-1.5 %), and could be cultivated at 10-40 °C (optimum 25 °C) and pH 5.5-9.5 (optimum pH 7.0-8.0). The strain was positive for catalase, oxidase, and hydrolysis of Tween 80, but negative for hydrolysis of DNA and gelatin, nitrite reduction, indole production, Voges-Proskauer reaction, and methyl red test. Strain D15-8PT could biodegrade naphthalene, phenanthrene, and anthracene. The major respiratory quinone was Q-9. The main cellular fatty acids were C12 : 0 (11.5 %), C14 : 0 3-methyl (22.0 %), C16 : 0 (19.2 %), C16 : 1ω9c (22.9 %), and C18 : 1ω9c (6.7 %). The polar lipids were phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, an unidentified aminophospholipid and an unidentified phospholipid. The DNA G+C content was 56.8 mol%. Phylogenetic analyses based on 16S rRNA genes showed that strain D15-8PT was most closely related to Marinobacter maritimus JCM 12521T (98.5 % 16S rRNA gene sequence similarity), Marinobacter antarcticus CGMCC 1.10835T (98.1 %), Marinobacter lipolyticus DSM 15157T (97.1 %), and Marinobacter guineae CECT 7243T (97.0 %). Results of the gyrB gene analysis and DNA-DNA hybridization were both less than the cut-off values (90 % for gyrB gene sequence similarity and 70 % for DNA-DNA hybridization). On the basis of this taxonomic study using a polyphasic approach, strain D15-8PT represents a novel species of the genus Marinobacter, for which the name Marinobacter aromaticivorans sp. nov. is proposed. The type strain is D15-8PT ( = CGMCC 1.11015T = KCTC 23781T).
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