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Allochromatium renukae sp. nov.

¹ Bacterial Discovery Laboratory, Centre for Environment, Institute of Science and Technology, J. N. T. University, Kukatpally, Hyderabad 500 085, India
² Department of Plant Sciences, School of Life Sciences, University of Hyderabad, P.O. Central University, Hyderabad 500 046, India

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

An ovoid to rod-shaped, phototrophic, purple sulfur bacterium, designated strain JA136^T, was isolated in pure culture from brackish water near Kakinada, India, in a medium that contained 2 % NaCl (w/v). Cells were Gram-negative and motile by means of a single polar flagellum. Strain JA136^T had no absolute salt requirement for growth but was able to tolerate up to 4 % NaCl (w/v). Intracellular photosynthetic membranes were of the vesicular type. Bacteriochlorophyll a and the carotenoid lycopene of the rhodopinal series were present as photosynthetic pigments. Strain JA136^T was able to grow photolithoautotrophically and photolithoheterotrophically. There was no vitamin requirement for growth of strain JA136^T. Phylogenetic analysis on the basis of 16S rRNA gene sequences indicated that strain JA136^T clustered with species of the genus Allochromatium in the class Gammaproteobacteria. Strain JA136^T showed highest 16S rRNA gene sequence similarity with the type strains of Allochromatium vinosum (97.0 %), Allochromatium minutissimum (95.8 %) and Allochromatium warmingii (90.0 %). Based on 16S rRNA gene sequence similarity data and morphological and physiological characteristics, strain JA136^T was sufficiently distinct from recognized Allochromatium species to be described as representing a novel species of the genus, for which the name Allochromatium renukae sp. nov. is proposed. The type strain is JA136^T (=JCM 14262^T =DSM 18713^T).

An electron micrograph of an ultrathin section of a cell of strain JA136^T and a figure showing the whole-cell absorption spectrum and acetone spectrum of pigments of strain JA136^T are available as supplementary material with the online version of this paper.