Abstract
The aims of this study were to investigate the presence of mercury (Hg) contamination in shrimp ponds in the south of Thailand and to isolate Hg-resistant purple nonsulfur bacteria (PNSB). Contamination by total mercury (HgT) in water and sediment samples ranged from <0.0002 to 0.037 μg/L and from 30.73 to 398.84 μg/kg dry weight. In all water and sediment samples, the concentration of HgT was less than the Thai, Hong Kong, and Canadian standard guidelines. Of the Hg-resistant PNSB, six strains detoxified Hg2+ by volatilization to Hg0 using their mercuric reductase enzyme. The ability of PNSB to resist Hg2+ in aerobic dark conditions was better than in microaerobic light, and this corresponded with their Hg reductase activities (dark condition 15.75, 12.62, and 12.16 U/mg protein for strains SSW15-1, SRW1-5, and SSS2-1, respectively). The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values were the same under both incubating conditions at 2.40 mg/L for SRW1-5 and 1.60 mg/L for SSW15-1. However, both values under light condition of SSS2-1 were 3.20 mg/L while under dark-condition MIC and MBC values were 3.20 and 4.00 mg/L. The half maximal inhibitory concentration (IC50) values of Hg2+ on strains SSS2-1, SRW1-5, and SSW15-1 under dark and light conditions were 2.16, 1.23, and 0.90; and 1.66, 1.11, and 0.80 mg/L, respectively. They were identified using 16S ribosomal RNA (rRNA) genes establishing that SSS2-1 and SSW15-1 were Afifella marina, while SRW1-5 was Rhodovulum sulfidophilum. These strains can potentially be used to treat Hg-contaminated shrimp ponds.
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Acknowledgments
This work was financially supported by the Thailand Research Fund through the Royal Golden Jubilee (RGJ) Ph.D. Program, grant number PHD/0165/2552, and partly supported by the Graduate School, Prince of Songkla University. We thank Dr. Brian Hodgson for his assistance with the English language.
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Supplementary figure 1
Inhibitory effect of HgCl2 against the growth of the selected PNSB strains grown in GA broth containing HgCl2 (0-4.0 mg/L) and 3 % NaCl under conditions of aerobic dark (A) and microaerobic light (B) for 72 h to determine IC50 values (DOCX 71 kb)
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Mukkata, K., Kantachote, D., Wittayaweerasak, B. et al. Distribution of Mercury in Shrimp Ponds and Volatilization of Hg by Isolated Resistant Purple Nonsulfur Bacteria. Water Air Soil Pollut 226, 148 (2015). https://doi.org/10.1007/s11270-015-2418-2
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DOI: https://doi.org/10.1007/s11270-015-2418-2