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Int J Syst Evol Microbiol 59 (2009), 1278-1281; DOI  10.1099/ijs.0.003889-0
© 2009 International Union of Microbiological Societies

Marispirillum indicum gen. nov., sp. nov., isolated from a deep-sea environment

Qiliang Lai, Jun Yuan, Li Gu 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 B142T, which was isolated from a crude-oil-degrading microbial consortium via enrichment with deep water from the Indian Ocean. Cells of the isolate were Gram-negative, oxidase-negative, catalase-positive, helical in shape, motile by means of polar flagella (three per cell) and moderately halophilic. Growth was observed at salinities of 0.5–12 % and at temperatures of 10–41 °C. The micro-organism was capable of denitrification, but was unable to degrade Tween 80 or gelatin. The predominant fatty acids were C16 : 1{omega}7c and/or iso-C15 :0 2-OH (6.4 %), C16 : 0 (15.7 %), C18 : 1{omega}7c (45 %), C18 : 0 (6.8 %) and C19 : 0{omega}8c cyclo (6.7 %). The G+C content of the chromosomal DNA was 67.3 mol%. Comparisons of 16S rRNA gene sequences showed that strain B142T was most closely related to the type strains of two Insolitispirillum peregrinum subspecies (93.0–93.1 % sequence similarity), two Novispirillum itersonii subspecies (92.8–92.9 %) and Caenispirillum bisanense (91.7 %); sequence similarities with respect to other taxa were below 90.5 %. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain B142T formed a distinct evolutionary lineage within the family Rhodospirillaceae. Strain B142T was distinguishable from phylogenetically related genera with regard to several phenotypic properties. On the basis of phenotypic and phylogenetic data, therefore, strain B142T represents a novel genus and species, for which the name Marispirillum indicum gen. nov., sp. nov. is proposed. The type strain is B142T (=CCTCC AB 208225T=LMG 24627T=MCCC 1A01235T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain B142T is EU642410.

Transmission electron micrographs of cells of strain B142T and a table showing the cellular fatty acid contents of strain B142T and related taxa are available as supplementary material with the online version of this paper.






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