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Rhodobacter ovatus sp. nov., a phototrophic alphaproteobacterium isolated from a polluted pond

¹ Bacterial Discovery Laboratory, Centre for Environment, Institute of Science and Technology, J. N. T. University, Kukatpally, Hyderabad 500 085, India
² DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Inhoffenstraße 7B, 38124 Braunschweig, Germany
³ 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

A novel ovoid, phototrophic, purple non-sulfur bacterium was isolated in pure culture from a sample of sediment from an industrially polluted pond (Noor Mohammad Kunta) in Hyderabad, India. Strain JA234^T was found to be Gram-negative and non-motile and grew photoheterotrophically with a number of organic compounds serving as carbon source/electron donor. Photo-organoheterotrophic and chemo-organoheterotrophic growth were demonstrated. Biotin and thiamine were required for growth of strain JA234^T. Phylogenetic analysis on the basis of 16S rRNA gene sequences showed that strain JA234^T is most closely related to Rhodobacter azotoformans (97.3 % sequence similarity) and clusters with other species of the genus Rhodobacter of the family Rhodobacteraceae. However, DNA–DNA hybridization with Rba. azotoformans JCM 9340^T showed a relatedness of only 31.3 % with respect to strain JA234^T. On the basis of 16S rRNA gene sequence analysis, DNA–DNA hybridization data and morphological and physiological characteristics, strain JA234^T represents a novel species of the genus Rhodobacter, for which the name Rhodobacter ovatus sp. nov. is proposed. The type strain is JA234^T (=JCM 14779^T=CCUG 55049^T).

An electron micrograph of an ultrathin section of a cell of strain JA234^T showing the vesicular nature of the photosynthetic membranes is available as a supplementary figure with the online version of this paper.

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