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Published online ahead of print on 19 June 2009 as doi:ijs.0.004283-0
International Journal of Systematic and Evolutionary Microbiology 2009;59:1645.

Int J Syst Evol Microbiol (2009); DOI 10.1099/ijs.0.004283-0
© 2009 International Union of Microbiological Societies
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Vibrio azureus sp. nov., a luminous marine bacterium isolated from seawater

Susumu Yoshizawa1, Minoru Wada, Kumiko Kita-Tsukamoto, Eiko Ikemoto, Akira Yokota and Kazuhiro Kogure

Tokyo university

1 E-mail: y_susumu{at}nenv.k.u-tokyo.ac.jp

Two marine luminous bacteria, LC2-005T and LC2-102, were isolated from seawater at Kuroshio Region and Sagami Bay in Japan respectively. These bacteria were Gram-negative, oxidase-positive, catalase-positive, motile and rod-shaped. Strains LC2-005T and LC2-102 were in a cluster within Vibrio harveyi species group on the basis of 16S rRNA gene sequence analysis. However, multilocus sequence analysis (MLSA) using five loci (pyrH, ftsZ, mreB, gyrB and gapA) and DNA-DNA hybridization experiments indicated that these strains were discriminated from the currently known Vibrio species. Additionally, these strains differ from related Vibrio species by the utilization of glucose, mannitol, inositol, sorbitol, rhamnose, sucrose, melibiose and arabinose and production of lysine decarboxylase, ornithine decarboxylase, tryptophan deaminase, esterase (C4), lipase (C4), chymotrypsin, acid phosphatase, {alpha}-glucosidase, β-glucosidase and N-acetyl-β-glucosaminidase and the ability of reducing nitrate to nitrite. The major fatty acids were C15:0 iso 2-OH and/or C16:1{omega}7c, C16:0, C18:1{omega}7c, C14:0. The DNA G+C contents of LC2-005T and LC2-102 were 45.2 and 45.5 mol%, respectively. On the basis of the polyphasic taxonomic evidences presented in this study, it can be concluded that strains LC2-005T and LC2-102 belong to the same genospecies and represents a novel species of the genus Vibrio, for which the name Vibrio azureus sp. nov. is proposed. The type strain is LC2-005T (=NBRC 104587T =KCTC 22352T).






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