Abstract
Three strains (JA349 T, JA553 T, JA439) of phototrophic sulphur bacteria were isolated from marine habitats of India. 16S rRNA gene sequence of the three strains clustered phylogenetically with members of the genus Marichromatium of the family Chromatiaceae belonging to the class Gammaproteobacteria. All the strains shared highest sequence similarity with the type strains of Marichromatium spp. (96–99% sequence similarity) and the new strains were characterized based on polyphasic taxonomy. Strains JA349 T and JA553 T can be distinguished from closest relative species of the genus Marichromatium with respect to distinct differences in cellular polar lipids, fatty acids and carbon/nitrogen sources utilization. Both strains were distinctly related (<50% based on DNA–DNA hybridization) with the type strains of the genus Marichromatium. Multilocus Sequence Analysis (MLSA) of the concatenated five protein coding genes ( fusA, pufM, dnaK, recA, soxB) along with internal transcribed spacer (ITS; 16S–23S rRNA) had sequence similarity of less than 92% with the type strains of Marichromatium spp. Distinct phenotypic, chemotaxonomic and molecular differences allow the separation of strains JA349 T and JA553 T into new species of the genus Marichromatium for which, we propose the names Marichromatium litoris sp. nov. and Marichromatium chrysaorae sp. nov., respectively.
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