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Neptunomonas antarctica sp. nov., isolated from Antarctic marine sediment

¹ The State Key Laboratory of Microbial Technology, Shandong University;
² SOA Key Laboratory for Polar Science, Polar Research Institue of China

³ E-mail: zhangyz{at}sdu.edu.cn

A Gram-negative, motile, oxidase- and catalase-positive and facultatively aerobic bacterium, designated S3-22T, was isolated from the marine sediments of the Nella Fjord, Antarctica. Strain S3-22T could reduce nitrate to nitrite and grow at pH 6.0-8.0, at 4-25°C and in the presence of 0.5-5% NaCl (w/v). It contained Q8 as the only respiratory quinone and Summed Feature 3 (comprising C16:1c and/or iso-C15:02-OH), C16:0 and C18:1c as the major cellular fatty acids. The genomic DNA G+C content was 45.6 mol%. Phylogenetic analyses of 16S rRNA gene sequences showed that strain S3-22T was affiliated with the genus Neptunomonas, with 97.1% sequence similarity to Neptunomonas japonica JCM 14595T and 94.8% to Neptunomonas naphthovorans ATCC 700637T, the only two recognized Neptunomonas species. The DNA-DNA similarity value between strain S3-22T and its nearest phylogenetic neighbour Neptunomonas japonica JCM 14595T was 20.4%. Strain S3-22T could be distinguished from other Neptunomonas species by several phenotypic properties. Based on the polyphasic evidence, strain S3-22T represents a novel Neptunomonas species, for which the name Neptunomonas antarctica sp. nov. is proposed. The type strain is S3-22T (=CCTCC AB 209086T=KACC 14056T).