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Int J Syst Evol Microbiol 58 (2008), 1128-1133; DOI  10.1099/ijs.0.65507-0
© 2008 International Union of Microbiological Societies

Microbulbifer agarilyticus sp. nov. and Microbulbifer thermotolerans sp. nov., agar-degrading bacteria isolated from deep-sea sediment

Masayuki Miyazaki1, Yuichi Nogi1, Yukari Ohta1, Yuji Hatada1, Yoshihiro Fujiwara1, Susumu Ito2 and Koki Horikoshi1

1 Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
2 Creative Research Initiative Sousei (CRIS) in Hokkaido University, N21W10 Kita-ku, Sapporo 001-0021, Japan

Correspondence
Yuichi Nogi
nogiy{at}jamstec.go.jp

Nine agar-degrading strains, designated JAMB A3T, JAMB A7, JAMB A24, JAMB A33, JAMB A94T, JAMM 0654, JAMM 0793, JAMM 1327 and JAMM 1340, were isolated from deep-sea sediment in Suruga Bay and Sagami Bay and off Kagoshima, Japan. On the basis of 16S rRNA gene sequence analysis, the strains were found to be closely affiliated with members of the genera Microbulbifer and Thalassomonas. The hybridization values for DNA–DNA relatedness between two of these strains and Microbulbifer reference strains were significantly lower than that accepted as the phylogenetic definition of a species. On the basis of their distinct taxonomic characteristics, six of the isolated strains represent two novel species of the genus Microbulbifer, for which the names Microbulbifer agarilyticus sp. nov. (type strain JAMB A3T =JCM 14708T =DSM 19200T) and Microbulbifer thermotolerans sp. nov. (type strain JAMB A94T =JCM 14709T =DSM 19189T) are proposed.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains JAMB A3T and JAMB A94T are AB158515 and AB124836, respectively.

Fatty acid compositions of strains JAMB A3T and JAMB A94T and related strains are presented in a supplementary table available with the online version of this paper.






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