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Int J Syst Evol Microbiol 59 (2009), 1733-1737; DOI  10.1099/ijs.0.004341-0
© 2009 International Union of Microbiological Societies

Oceanibaculum indicum gen. nov., sp. nov., isolated from deep seawater of the Indian Ocean

Qiliang Lai, Jun Yuan, Changliang Wu and Zongze Shao

Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, PR China

Correspondence
Zongze Shao
shaozz{at}163.com

A taxonomic study was carried out on strain P24T, which was isolated from a polycyclic aromatic hydrocarbon-degrading consortium, enriched from a deep-seawater sample collected from the Indian Ocean. The isolate was Gram-negative, rod-shaped, motile by means of a polar flagellum, moderately halophilic and capable of reducing nitrate to nitrite. Growth was observed at salinities of 0–9 % and at temperatures of 10–42 °C. The strain was unable to degrade Tween 80 or gelatin. The dominant fatty acids were C16 : 0 (15.2 % of the total), C18 : 0 (10.3 %), C18 : 1{omega}7c (52.0 %), C18 : 1 2-OH (4.7 %) and C19 : 0{omega}8c cyclo (4.7 %). The G+C content of the chromosomal DNA was 64.8 mol%. 16S rRNA gene sequence comparisons showed that strain P24T was related most closely to Thalassobaculum litoreum CL-GR58T (92.7 % similarity); levels of similarity between strain P24T and type strains of recognized species in the family Rhodospirillaceae were all less than 90.8 %. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain P24T formed a distinct evolutionary lineage within the family Rhodospirillaceae. Strain P24T could be distinguished from phylogenetically related genera based on differences in several phenotypic properties. On the basis of the phenotypic and phylogenetic data presented, strain P24T is considered to represent a novel species of a new genus, for which the name Oceanibaculum indicum gen. nov., sp. nov. is proposed. The type strain is P24T (=CCTCC AB 208226T=LMG 24626T=MCCC 1A02083T).

Abbreviations: PAH, polycyclic aromatic hydrocarbon

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain P24T is EU656113.

Transmission electron micrographs of negatively stained cells of strain P24T and a table giving the cellular fatty acid contents of strain P24T and related genera are available as supplementary material with the online version of this paper.






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