Investigation of Arsenotrophic Microbiome in Arsenic-Affected Bangladesh Groundwater.

Autor: Sultana M, Mou TJ; Department of Microbiology, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh.; Department of Microbiology, University of Dhaka, Dhaka 1000, Bangladesh., Sanyal SK; Department of Microbiology, University of Dhaka, Dhaka 1000, Bangladesh.; Currently at Department of Microbiology, Jagannath University, Dhaka 1100, Bangladesh., Diba F; Department of Microbiology, University of Dhaka, Dhaka 1000, Bangladesh., Mahmud ZH; Environmental Microbiology Laboratory, International Center for Diarrhoeal Disease Research, 68 Shaheed Tajuddin Ahmed Sarani, Mohakhali, Dhaka 1212, Bangladesh., Parvez AK; Department of Microbiology, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh., Hossain MA; Department of Microbiology, University of Dhaka, Dhaka 1000, Bangladesh.
Jazyk: angličtina
Zdroj: Ground water [Ground Water] 2017 Sep; Vol. 55 (5), pp. 736-746. Date of Electronic Publication: 2017 Apr 18.
DOI: 10.1111/gwat.12520
Abstrakt: Arsenotrophic bacteria contribute to the nutrient cycling in arsenic (As) affected groundwater. This study employed a culture-independent and -dependent investigation of arsenotrophic microbiomes in As affected groundwater samples collected from Madhabpur, Sonatengra, and Union Porishod in Singair Upazila, Manikganj, Bangladesh. Total As contents, detected by Atomic Absorption Spectrophotometry (AAS) of the samples, were 47 µg/L (Madhabpur, SNGW-1), 53 µg/L (Sonatengra, SNGW-2), and 12 µg/L (Union porishod, SNGW-3), whereas the control well (SNGW-4; depths >150 m) showed As content of 6 µg/L. Denaturing Gradient Gel Electrophoresis (DGGE) analysis of the amplified 16S rRNA gene from As-affected groundwater samples revealed the dominance of aerobic bacteria Pseudomonas within heterogeneous bacterial populations. DGGE of heterotrophic enrichments supplemented with arsenite [As (III)] for 4 weeks showed the dominance of Chryseobacterium, Flavobacterium, and Aquabacterium, whereas the dominant genera in that of autotrophic enrichments were Aeromonas, Acinetobacter, and Pseudomonas. Cultured bacteria retrieved from both autotrophic and heterotrophic enrichments were distinguished into nine genotypes belonging to Chryseobacterium, Acinetobacter, Escherichia, Pseudomonas, Stenotrophomonas, Janibacter, Staphylococcus, and Bacillus. They exhibited varying range of As(III) tolerance from 4 to 27 mM. As(III) transformation potential was confirmed within the isolates with oxidation rate as high as 0.143 mM/h for Pseudomonas sp. Sn 28. The arsenotrophic microbiome specifies their potential role in groundwater As-cycling and their genetic information provide the scientific basis for As-bioremediation.
(© 2017, National Ground Water Association.)
Databáze: MEDLINE
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