Responses of activities, abundances and community structures of soil denitrifiers to short-term mercury stress

Zhou, Zhifeng; Zheng, Yuqi; Shen, Ju-Pei; Zhang, Limei; Liu, Yurong; He, Ji‐Zheng

doi:10.1016/s1001-0742(11)60747-x

Cited by 29 publications

(11 citation statements)

References 33 publications

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“…No significant relationship was observed between the abundance of SRM and the Hg contents in the soils at the four sites, suggesting that long-term Hg contamination did not changed abundance of SRM in the present study. This result was different from the previous studies based on short-term incubation experiments showing a negative influence of Hg pollution on the abundance of microorganism Zhou et al 2012). These different effects could be attributed to their different polluted duration by Hg, and some microbial groups in soil might exhibit some resistance or adaptation to long-term Hg stress (Barkay et al 2003).…”

Section: Abundance Of Srm In Soilscontrasting

confidence: 96%

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

Liu

Zheng

Zhang

et al. 2013

Environ Sci Pollut Res

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Sulfate-reducing microorganisms (SRM) have been thought to play a key role in mercury (Hg) methylation in anoxic environments. The current study examined the linkage between SRM abundance and diversity and contents of methylmercury (MeHg) in paddy soils collected from a historical Hg mining area in China. Soil profile samples were collected from four sites over a distance gradient downstream the Hg mining operation. Results showed that MeHg content in the soil of each site significantly decreased with the extending distance away from Hg mine. Soil MeHg content was correlated positively with abundance of SRM and the contents of organic matter (OM), NH 4 + , SO 4 2− , and Hg. The abundances of SRM based on dissimilatory (bi) sulfite reductase (dsrAB) gene at 0-40 cm depths were higher than those at 40-80 cm depth at all sites. The SRM community composition varied in the soils of different sampling sites following terminal restriction fragment length polymorphism (T-RFLP) and phylogenetic analyses, which appeared to be correlated with contents of MeHg, OM, NH 4 + , and SO 4 2− through canonical correspondence analysis. The dominant groups of SRM in the soils examined belonged to Deltaproteobacteria and some unknown SRM clusters that could have potential for Hg methylation. These results advance our understanding of the relationship between SRM and methylmercury concentration in paddy soil.

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Section: Abundance Of Srm In Soilscontrasting

confidence: 96%

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

Liu

Zheng

Zhang

et al. 2013

Environ Sci Pollut Res

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“…in response to elevated MeHg. Increased Hg pollution is known to inhibit the processes of nitrogen cycle driven by soil functional assembles [ 9 , 33 ], which could be an important result of the inhibiting effect of Hg to nitrifying bacteria such as Nitrospirae . These results suggest that the sensitive taxa could be used as potential ecological indicators for Hg pollution in terrestrial ecosystems.…”

Section: Discussionmentioning

confidence: 99%

Consistent responses of soil microbial taxonomic and functional attributes to mercury pollution across China

et al. 2018

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BackgroundThe ecological consequences of mercury (Hg) pollution—one of the major pollutants worldwide—on microbial taxonomic and functional attributes remain poorly understood and largely unexplored. Using soils from two typical Hg-impacted regions across China, here, we evaluated the role of Hg pollution in regulating bacterial abundance, diversity, and co-occurrence network. We also investigated the associations between Hg contents and the relative abundance of microbial functional genes by analyzing the soil metagenomes from a subset of those sites.ResultsWe found that soil Hg largely influenced the taxonomic and functional attributes of microbial communities in the two studied regions. In general, Hg pollution was negatively related to bacterial abundance, but positively related to the diversity of bacteria in two separate regions. We also found some consistent associations between soil Hg contents and the community composition of bacteria. For example, soil total Hg content was positively related to the relative abundance of Firmicutes and Bacteroidetes in both paddy and upland soils. In contrast, the methylmercury (MeHg) concentration was negatively correlated to the relative abundance of Nitrospirae in the two types of soils. Increases in soil Hg pollution correlated with drastic changes in the relative abundance of ecological clusters within the co-occurrence network of bacterial communities for the two regions. Using metagenomic data, we were also able to detect the effect of Hg pollution on multiple functional genes relevant to key soil processes such as element cycles and Hg transformations (e.g., methylation and reduction).ConclusionsTogether, our study provides solid evidence that Hg pollution has predictable and significant effects on multiple taxonomic and functional attributes including bacterial abundance, diversity, and the relative abundance of ecological clusters and functional genes. Our results suggest an increase in soil Hg pollution linked to human activities will lead to predictable shifts in the taxonomic and functional attributes in the Hg-impacted areas, with potential implications for sustainable management of agricultural ecosystems and elsewhere.Electronic supplementary materialThe online version of this article (10.1186/s40168-018-0572-7) contains supplementary material, which is available to authorized users.

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“…The Nir S gene structure also changed in the presence of mercury stress as indicated by the denaturing gradient gel electrophoresis profile. Denitrification activity was found to increase with a change in the gene structure of the Nir S gene in the presence of mercury stress (Zhou et al ). In the scenario of waters having high levels of nitrate and heavy metal ions, treatment with metal‐resistant bacteria having a denitrifying capability can be of great advantage.…”

Section: Aerobic Denitrification In the Presence Of Metal Ionsmentioning

confidence: 99%

Role of heterotrophic aerobic denitrifying bacteria in nitrate removal from wastewater

et al. 2020

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With the increase in industrial and agricultural activities, a large amount of nitrogenous compounds are released into the environment, leading to nitrate pollution. The perilous effects of nitrate present in the environment pose a major threat to human and animal health. Bioremediation provides a costeffective and environmental friendly method to deal with this problem. The process of aerobic denitrification can reduce nitrate compounds to harmless dinitrogen gas. This review provides a brief view of the exhaustive role played by aerobic denitrifiers for tackling nitrate pollution under different ecological niches and their dependency on various environmental parameters. It also provides an understanding of the enzymes involved in aerobic denitrification. The role of aerobic denitrification to solve the issues faced by the conventional method (aerobic nitrification-anaerobic denitrification) in treating nitrogenpolluted wastewaters is elaborated. verts the iron centre of haemoglobin from Fe 2+ to Fe 3+ Role of heterotrophic aerobic denitrifying bacteriaA. Rajta et al.

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Responses of activities, abundances and community structures of soil denitrifiers to short-term mercury stress

Cited by 29 publications

References 33 publications

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

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

Consistent responses of soil microbial taxonomic and functional attributes to mercury pollution across China

Role of heterotrophic aerobic denitrifying bacteria in nitrate removal from wastewater

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