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


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Phase-contrast micrograph of cells of strain JA276 . Bar, 5 µm.


Whole-cell absorption spectrum (a) and acetone spectrum (b) of pigments extracted from strain JA276 .


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