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Rhodobium gokarnense sp. nov., a novel phototrophic alphaproteobacterium from a saltern

¹ Environmental Microbial Biotechnology Laboratory, Centre for Environment, Institute of Science and Technology, J. N. T. University, Kukatpally, Hyderabad 500 072, India
² Department of Plant Sciences, School of Life Sciences, University of Hyderabad, PO Central University, Hyderabad 500 046, India
³ Leibniz-Institut für Meereswissenschaften IFM-GEOMAR, Marine Mikrobiologie, Düsternbrooker Weg 20, 24105 Kiel, Germany

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

A pink-pigmented, phototrophic, purple nonsulfur bacterium, strain JA173^T, was isolated in pure culture from a saltern in Gokarna, India, in a medium containing 2 % (w/v) NaCl. Strain JA173^T was a non-motile Gram-negative rod that multiplied by budding. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain JA173^T clusters with the class Alphaproteobacteria; highest sequence similarity (98 %) was to the type strain of Rhodobium orientis and 94 % similarity was observed to the 16S rRNA gene sequence of the type strain of Rhodobium marinum. However, DNA–DNA hybridization with R. orientis DSM 11290^T revealed a relatedness value of only 35.1 % with strain JA173^T. Strain JA173^T contained lamellar internal membranes, bacteriochlorophyll a and carotenoids of the spirilloxanthin series. Strain JA173^T had an obligate requirement for NaCl (optimum growth at 2–6 %, w/v) and grew photoheterotrophically with a number of organic compounds as carbon source or electron donor. Photoautotrophic, chemoautotrophic and fermentative growth could not be demonstrated. Yeast extract was required for growth. Based on 16S rRNA gene sequence analysis, DNA–DNA hybridization data and morphological and physiological characteristics, strain JA173^T is sufficiently different from other species of the genus Rhodobium to be recognized as a representative of a novel species, Rhodobium gokarnense sp. nov. The type strain is JA173^T (=ATCC BAA-1215^T=DSM 17935^T=JCM 13532^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain JA173^T is AM180706.

A phase contrast micrograph, an electron micrograph, absorption spectra and FTIR spectra of strain JA173^T are available as supplementary material in IJSEM Online.

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