Isolation and Identification of Sulfate-reducing Bacteria from Pearl River Sediment
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Abstract:
Sulfate-reducing bacteria (SRB) have great significance in improving the quality of water resources and ensuring the safety of food and drinking water , due to their ability in producing sulfides which could precipitate heavy metal ions in the form of metal sulfides. SCUT-3, a rod shaped gram negative sulfate reducing bacterium, was isolated from the Pearl River sediment sample. SCUT-3 can utilize lactate, acetate and propionate as sole carbon source and sulfate as the terminal electron acceptor. Glucose and ethanol could not be utilized as carbon sources. Thiosulfate and sulfite could not be utilized as terminal electron acceptor. Phylogenetic analysis based on aprA and 16S rRNA genes slightly differed between each other. SCUT-3 showed the highest similarity on the 16S rRNA genes (87%) to Desulfovibrio acrylicus, andthe highest similarity on the aprA genes (90%, by blastx) to Desulfovibrio vulgaris str. Hildenborough, indicating that SCUT-3 belonged to the genus Desulfovibrio. But the relative low similarity (91% utmost) indicates that the new isolated strain might belong to a new species of this genus.
