ABSTRACT
Indigenous bacteria play an important role for arsenic (As) mobilization in aqueous environment. In present study, investigated reduction characteristics of arsenate by different indigenous bacterial isolates KTL (GU329910), CL (GU329907) and BL (GU329908), which was isolated from Kuan-Tzu-Ling (KTL), Chung-Lun (CL) and Bao-Lai (BL) hot springs (Taiwan) respectively. Morphological and 16S-rRNA analysis exhibits that the pure culture of isolate KTL (GU329910), CL (GU329907) and BL (GU329908) are similar (99% similarity) to Bacillus pocheonensis, Desulfovibrio psychrotolerans (sulfate reducing deltaproteobacterium), and Clostridium sulfidigenes (mesophilic, proteolytic, thiosulfate- and sulfur-reducing bacterium), respectively. D. psychrotolerans (GU329907) and C. sulfidigenes (GU329908) reduced SO4 2− to S2− and As(V) to As(III), efficiently. The growth rate and arsenic reduction was exhibited higher in presence of D. psychrotolerans (GU329907) compared to C. sulfidigenes (GU329908). Thus, the sulfate reducing bacteria contributes in arsenic mobilization process and forms more toxic As(III) species, which affects the biotic life.
