Abstract
Achromobacter xylosoxidans is a versatile bacterium known for its ability to degrade aromatic compounds. However, its ability to oxidize sulfur compounds for electron and energy source is not reported much. In the present work, the Gram-negative bacterium Achromobacter xylosoxidans strain wsp05 isolated from a waste stabilization ponds (WSPs) system was studied for its ability to oxidize reduced sulfur compounds. The strain was able to oxidize thiosulfate and sodium sulfite. To observe the effect of physicochemical parameters on the rate of sulfur oxidation, strain wsp05 was grown in thiosulfate (20mM) containing minimal salt medium at varied pH, temperature and ammonium and phosphate ions concentration. Maximum thiosulfate oxidation was observed at 30°C with initial pH of 7-7.2. The strain was characterized using universal 16S rRNA gene primers revealing high similarity (> 99%) with Achromobacter xylosoxidans NBRC 15126T belonging to β-proteobacteria. In the present study, we investigated the sulfur oxidation properties of the Achromobacter xylosoxidans strain wsp05, which revealed an ecological and phylogenetic widening over which the thiotrophs are distributed.
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