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Marinobacter maritimus sp. nov., a psychrotolerant strain isolated from sea water off the subantarctic Kerguelen islands

¹ Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
² Université P. & M. Curie (Paris 6), Observatoire Océanologique de Banyuls, CNRS URA 2071, F-66650 Banyuls sur Mer, France

Correspondence
S. Shivaji
shivas{at}ccmb.res.in

A psychrotolerant, Gram-negative, motile bacterium, designated CK 47^T, was isolated from sea water off the subantarctic Kerguelen islands (50° 40' S 68° 25' E). The isolate grew optimally at 22 °C and minimum and maximum temperature of growth were 4 and 37 °C, respectively. It required Na⁺ for growth and exhibited optimum growth at pH 8·5 and 4 % NaCl. It utilized hexane, heptane and petroleum ether as sole sources of carbon. Strain CK 47^T had Q9 as the major respiratory quinone and C_{16 : 0} (21·7 %), C_{17 : 0} (21·3 %), C_{18 : 0} (5·7 %), C_{18 : 1}7c (9·0 %) and C_{18 : 1}9c (31·4 %) as predominant fatty acids. The G+C content of the DNA was 58 mol%. Phylogenetic analysis based on the 16S rRNA gene sequence indicated that CK 47^T formed a coherent cluster within the genus Marinobacter. It exhibited highest 16S rRNA gene sequence similarity of 96·8 % with Marinobacter lipolyticus. However, the level of DNA–DNA relatedness between strain CK47^T and M. lipolyticus was only 55 %. On the basis of phenotypic characteristics, and phylogenetic and genotypic distinctiveness, strain CK 47^T is considered to represent a novel species of the genus Marinobacter. The name Marinobacter maritimus sp. nov. is proposed, with CK 47^T (=JCM 12521^T=MTCC 6519^T) as the type strain.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain CK 47^T is AJ704395.

Details of phenotypic characteristics and cellular fatty acid profiles of CK 47^T and other Marinobacter species are available as supplementary material in IJSEM Online.

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