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Rhodobacter maris sp. nov., a phototrophic alphaproteobacterium isolated from a marine habitat of India

¹ Bacterial Discovery Laboratory, Centre for Environment, Institute of Science and Technology, JNT University, Kukatpally, Hyderabad 500 085, India
² Department of Plant Sciences, School of Life Sciences, University of Hyderabad, PO Central University, Hyderabad 500 046, India

Correspondence
Ch. Sasikala
r449{at}sify.com
or
sasi449{at}yahoo.ie

During investigations into the diversity of anoxygenic phototrophic bacteria in marine habitats, an ovoid to rod-shaped purple non-sulfur bacterium, designated strain JA276^T, was isolated from enrichments under photoheterotrophic conditions from a marine sediment sampled from the seashore of Cochin, India. Strain JA276^T is a Gram-negative, motile, chain-forming bacterium that shows optimum growth under photoheterotrophic conditions and is also able to grow chemoorganotrophically. Thiamine is required as a growth factor. Strain JA276^T contains vesicular intracytoplasmic membranes, bacteriochlorophyll a and the carotenoids spheroidene and spheroidenone. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain JA276^T belongs to the genus Rhodobacter and is closely related to the type strain of Rhodobacter capsulatus (96.2 % sequence similarity). On the basis of the results of 16S rRNA gene sequence analysis and morphological and physiological data, strain JA276^T is significantly different from other species of the genus Rhodobacter and represents a novel species of the genus, for which the name Rhodobacter maris sp. nov. is proposed. The type strain is JA276^T (=JCM 14794^T =ATCC BAA-1549^T =CCUG 55129^T).

A phase-contrast micrograph of strain JA276^T and spectra for pigments extracted from the strain are available as supplementary material with the online version of this paper.

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