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Abstract

A spherical-shaped, phototrophic, purple sulfur bacterium was isolated in pure culture from anoxic sediment in a marine aquaculture pond near Bheemli (India). Strain JA142 is Gram-negative and non-motile. It has a requirement for NaCl (optimum of 2 % and maximum of 6 % w/v NaCl). Intracellular photosynthetic membranes are of the vesicular type. absorption spectra indicate the presence of bacteriochlorophyll and carotenoids of the okenone series as photosynthetic pigments. Phylogenetic analysis on the basis of 16S rRNA gene sequences showed that strain JA142 is related to halophilic purple sulfur bacteria of the genera and , with the highest sequence similarity to DSM 6210 (97.5 %). Morphological and physiological characteristics differentiate strain JA142 from other species of the genera and . Strain JA142 is sufficiently different from based on 16S rRNA gene sequence analysis and morphological and physiological characteristics to allow the proposal of a novel species, sp. nov., with the type strain JA142 (=JCM 14780 =DSM 19078).

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2009-09-01
2019-10-22
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Phase-contrast micrograph of cells of strain JA142 . Bar, 5µm.

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Phylogenetic trees based on 16S rRNA gene sequences showing the relationship of strain JA142 within the family . [ PDF] 105 KB

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