Linkage between community diversity of sulfate-reducing microorganisms and methylmercury concentration in paddy soil

Liu, Yurong; Zheng, Yuqi; Zhang, Limei; He, Ji‐Zheng

doi:10.1007/s11356-013-1973-6

Cited by 42 publications

(22 citation statements)

References 51 publications

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“…Our result agreed to, at least in part, the previous studies suggesting that elevated soil THg contents did not result in any significant changes in the abundance of bacterial ammonia oxidisers [12] or sulphate-reducing microorganism [15]. This could be associated with Hg bioavailability in the examined soils, which may better explain the effect of Hg disturbance on soil bacterial abundance compared to the THg.…”

Section: Effects Of Hg Contamination On the Diversity Abundance And supporting

confidence: 92%

“…One subsample was stored at −20°C for THg, MeHg and molecular analyses, while another subsample was air-dried for general chemical analyses. Some basic soil chemical characteristics from the four sites are listed in Table S1 [15].…”

Section: Study Area and Sample Collectionmentioning

confidence: 99%

“…For THg analysis, soil samples were digested with HNO 3 +HCl (10 ml, 1:1v/v) in a Teflon tube at 100°C for 2 h, and the Hg concentration in the solution was measured using inductively coupled plasma mass spectrometry (ICP-MS). MeHg in the soil samples was extracted using CuSO 4 -methanol/solvent extraction, and the MeHg content was determined using HPLC-ICP-MS [15,32].…”

Section: Soil Chemical Analysismentioning

confidence: 99%

“…Nevertheless, effects of Hg on microbial communities were different between tropical and temperate soils [6]. Furthermore, Hg stress could also affect the community structure of some functional groups, such as ammonia-oxidising bacteria [12] and sulphate-reducing bacteria [15], which play key roles in N transformation and sulphate reduction, respectively. However, these studies on the influence of Hg contamination on bacterial communities were mainly conducted over relatively short time periods or on upland soils, and little is known of the effects of longterm Hg contamination on bacterial communities in paddy habitats.…”

Section: Introductionmentioning

confidence: 99%

“…Although many studies have been conducted across the Hg mining area on the health risks of Hg exposure [27][28][29], limited knowledge is available on the effects of long-term Hg contamination on bacterial community composition in the paddy soils. The paddy soil is a typical anaerobic habitat, where microorganisms could play key roles in both Hg reduction and methylation [15,30]. Knowledge regarding the bacterial community along Hg-contaminated gradient is crucial to predict the responses of microbial diversity and function to global Hg transportation and precipitation.…”

Section: Introductionmentioning

confidence: 99%

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Patterns of Bacterial Diversity Along a Long-Term Mercury-Contaminated Gradient in the Paddy Soils

et al. 2014

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Mercury (Hg) pollution is usually regarded as an environmental stress in reducing microbial diversity and altering bacterial community structure. However, these results were based on relatively short-term studies, which might obscure the real response of microbial species to Hg contamination. Here, we analysed the bacterial abundance and community composition in paddy soils that have been potentially contaminated by Hg for more than 600 years. Expectedly, the soil Hg pollution significantly influenced the bacterial community structure. However, the bacterial abundance was significantly correlated with the soil organic matter content rather than the total Hg (THg) concentration. The bacterial alpha diversity increased at relatively low levels of THg and methylmercury (MeHg) and subsequently approached a plateau above 4.86 mg kg −1 THg or 18.62 ng g −1 MeHg, respectively. Contrasting with the general prediction of decreasing diversity along Hg stress, our results seem to be consistent with the intermediate disturbance hypotheses with the peak biological diversity under intermediate disturbance or stress. This result was partly supported by the inconsistent response of bacterial species to Hg stress. For instance, the relative abundance of Nitrospirae decreased, while that of Gemmatimonadetes increased significantly along the increasing soil THg and MeHg concentrations. In addition, the content of SO 4 2− , THg, MeHg and soil depth were the four main factors influencing bacterial community structures based on the canonical correspondence analysis (CCA). Overall, our findings provide novel insight into the distribution patterns of bacterial community along the long-term Hg-contaminated gradient in paddy soils.

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Section: Effects Of Hg Contamination On the Diversity Abundance And supporting

confidence: 92%

Section: Study Area and Sample Collectionmentioning

confidence: 99%

Section: Soil Chemical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Patterns of Bacterial Diversity Along a Long-Term Mercury-Contaminated Gradient in the Paddy Soils

et al. 2014

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Diversity of microbial communities potentially involved in mercury methylation in rice paddies surrounding typical mercury mining areas in China

Liu

Zhuang

et al. 2018

MicrobiologyOpen

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Mercury can be a serious hazard to human health, especially in paddy soils surrounding mining areas. In this study, mercury (Hg)‐methylating microbes with the potential biomarker gene hgcA were obtained from 45 paddy soil samples in mercury mining areas in Fenghuang, Wanshan, and Xunyang. In different areas, the abundance of the hgcA gene was affected by different environmental factors, including organic matter, pH, total carbon content, total nitrogen content, and total mercury content. Phylogenetic analysis showed that hgcA microbes in paddy soils were potentially members of the phyla Proteobacteria, Euryarchaeota, Chloroflexi, and two unnamed groups. Canonical correspondence analysis showed that pH and organic matter impacted the hgcA gene diversity and the microbial community structures in paddy soils. The identification of Hg‐methylating microbes may be crucial for understanding mercury methylation/demethylation processes, which would be helpful in assessing the risk of methylmercury contamination in the food chain.

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Highly mercury-resistant strains from different Colombian Amazon ecosystems affected by artisanal gold mining activities

Cardona

Escobar

Acosta-González

et al. 2022

Appl Microbiol Biotechnol

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Two sites of the Colombian Amazon region with different levels of human intervention and mercury pollution were selected for the collection of samples of river and lake water, sediments, and associated forest soils. The Tarapacá region, affected mainly by barrage mining, showed low mercury concentrations, whilst in the Taraira region, affected by underground mining, there were several points with high mercury pollution levels. A collection of 72 bacterial and 10 yeast strains with different levels of mercury resistance was isolated and characterized. Most of the highly resistant bacterial strains (MIC > 40 mg L−1 HgCl2) were isolated from soil and sediment samples and belonged to either Pseudomonas (60%) or Bacillus (20%). Most of highly resistant bacterial strains were positive for the presence of the merA gene, suggesting an active mercury resistance mechanism. This was confirmed in the two most resistant strains, Pseudomonas sp. TP30 and Burkholderia contaminans TR100 (MIC = 64 and 71 mg L−1 HgCl2, respectively), which in the presence of increasing mercury concentrations expressed the merA gene at increasing levels, concomitant with a significant mercury reduction activity. Analysis of the MerA sequences present in the different isolates suggested a high gene conservation within the taxonomic groups but also several horizontal gene transfer events between taxonomically distant genera. We also observed a positive correspondence between the presence of the merA gene and the number of antibiotics to which the strains were resistant to. The most resistant strains are good candidates for future applications in the bioremediation of mercury-contaminated sites in the Amazon.Key points• Amazon sediments affected by underground gold mining have higher Hg levels.• Highly Hg-resistant isolates belonged to Pseudomonas and Bacillus genera.• TR100 and TP30 strains showed remediation potential to be used in the Amazon region. Graphical abstract

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Linkage between community diversity of sulfate-reducing microorganisms and methylmercury concentration in paddy soil

Cited by 42 publications

References 51 publications

Patterns of Bacterial Diversity Along a Long-Term Mercury-Contaminated Gradient in the Paddy Soils

Patterns of Bacterial Diversity Along a Long-Term Mercury-Contaminated Gradient in the Paddy Soils

Diversity of microbial communities potentially involved in mercury methylation in rice paddies surrounding typical mercury mining areas in China

Highly mercury-resistant strains from different Colombian Amazon ecosystems affected by artisanal gold mining activities

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