Arsenic-resistant <Emphasis Type="BoldItalic">Pseudomonas</Emphasis> spp. and <Emphasis Type="BoldItalic">Bacillus</Emphasis> sp. bacterial strains reducing As(V) to As(III), isolated from Alps soils,Italy |
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Authors: | M Pepi G Protano M Ruta V Nicolardi E Bernardini S E Focardi C Gaggi |
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Institution: | (1) Department of Environmental Sciences, University of Siena, 53100 Siena, Italy;(2) Via P.A. Mattioli 4, 53100 Siena, Italy;(3) Via Laterina 8, 53100 Siena, Italy |
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Abstract: | Five arsenic-resistant bacterial strains (designated MP1400, MP1400a, MP1400d, APSLA3, and BPSLA3) were isolated from soils
collected at the Alps region (Italy), which showed no contamination by arsenic. Phylogenetic analysis of the 16S rRNA gene
sequences assigned them to the genera Pseudomonas and Bacillus. Bacillus sp. strain 1400d and Pseudomonas spp. strains APSLA3 and MP1400 showed higher tolerance to As(III), as indicated by minimum inhibitory concentrations of 10 mmol/L.
Pseudomonas sp. strain MP1400 exhibited higher tolerance to As(V) (minimum inhibitory concentration of 135 mmol/L). The isolated arsenic-resistant
strains were able to reduce As(V) to As(III), especially Pseudomonas sp. strain MP1400 reducing 2 mmol/L of As(V) to As(III) within 24 h. The results suggest that the isolated bacterial strains
play a role in the arsenic biogeochemical cycle of arsenic-poor soils in the Alps mount area. |
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