Bioaccumulation of Hg in Rice Leaf Facilitates Selenium Bioaccumulation in Rice (<i>Oryza sativa L</i>.) Leaf in the Wanshan Mercury Mine

Chang, Chuan‐Yu; Chen, Chongying; Yin, Runsheng; Shen, Yuan; Mao, Kang; Yang, Zhugen; Feng, Xinbin; Zhang, Hua

doi:10.1021/acs.est.9b06486

Cited by 38 publications

(11 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although this study did not specifically test for the mechanisms involved in abiotic MeHg degradation, it is possible that abiotic demethylation at Hg mining sites could also be caused by the presence of high levels of Se (36.6). Indeed, the Wanshan Hg mine is a Se-rich area, , and MeHg degradation can be mediated by selenoamino acids via a bis(methylmercuric)selenide intermediate . Further investigation into the role of Se on MeHg cycling in a mining area is warranted.…”

Section: Results and Discussionmentioning

confidence: 99%

Methanogenesis Is an Important Process in Controlling MeHg Concentration in Rice Paddy Soils Affected by Mining Activities

Meng

et al. 2020

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Rice paddies are agricultural sites of special concern because the potent toxin methylmercury (MeHg), produced in rice paddy soils, accumulates in rice grains. MeHg cycling is mostly controlled by microbes but their importance in MeHg production and degradation in paddy soils and across a Hg concentration gradient remains unclear. Here we used surface and rhizosphere soil samples in a series of incubation experiments in combination with stable isotope tracers to investigate the relative importance of different microbial groups on MeHg production and degradation across a Hg contamination gradient. We showed that sulfate reduction was the main driver of MeHg formation and concentration at control sites, and that methanogenesis had an important and complex role in MeHg cycling as Hg concentrations increased. The inhibition of methanogenesis at the mining sites led to an increase in MeHg production up to 16.6-fold and a decrease in MeHg degradation by up to 77%, suggesting that methanogenesis is associated with MeHg degradation as Hg concentrations increased. This study broadens our understanding of the roles of microbes in MeHg cycling and highlights methanogenesis as a key control of MeHg concentrations in rice paddies, offering the potential for mitigation of Hg contamination and for the safe production of rice in Hg-contaminated areas.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Methanogenesis Is an Important Process in Controlling MeHg Concentration in Rice Paddy Soils Affected by Mining Activities

Meng

et al. 2020

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…TEM-EDX analysis results revealed that HgSe nanoparticles were formed in Seapplied soil in an anaerobic environment, which provided strong evidence for the direct Se-Hg interaction in soil (Wang et al, 2016). In addition, Chang et al (2020) suggested that rice leaves can directly take up elemental Hg from the atmosphere, and Hg-Se complex may then be formed in rice leaves. (ii) Co-exposure of Hg and Se can inhibit the growth of the sulfate-reducing bacterium D. desulfuricans when compared to Hg exposure alone (Truong et al, 2013), and this step is critical for the methylation of IHg, leading to reduced production of MeHg; (iii) Se addition also increases demethylation and evaporation of MeHg, resulting in decreased production of soil MeHg (Dang et al, 2019).…”

Section: The Role Of Selenium In the Regulation Of Mercury Bioavailabmentioning

confidence: 86%

“…TEM-EDX analysis results revealed that HgSe nanoparticles were formed in Se-applied soil in an anaerobic environment, which provided strong evidence for the direct Se-Hg interaction in soil ( Wang et al, 2016 ). In addition, Chang et al (2020) suggested that rice leaves can directly take up elemental Hg from the atmosphere, and Hg-Se complex may then be formed in rice leaves.…”

Section: Se Interaction With Heavy Metals (As Hg and Cd)mentioning

confidence: 99%

Selenium Biofortification and Interaction With Other Elements in Plants: A Review

et al. 2020

View full text Add to dashboard Cite

Selenium (Se) is an essential element for humans and animals and its deficiency in the diet is a global problem. Crop plants are the main source of Se for consumers. Therefore, there is much interest in understanding the factors that govern the accumulation and distribution of Se in the tissues of crop plants and the mechanisms of interaction of Se absorption and accumulation with other elements, especially with a view toward optimizing Se biofortification. An ideal crop for human consumption is rich in essential nutrient elements such as Se, while showing reduced accumulation of toxic elements in its edible parts. This review focuses on (a) summarizing the nutritional functions of Se and the current understanding of Se uptake by plant roots, translocation of Se from roots to shoots, and accumulation of Se in grains; and (b) discussing the influence of nitrogen (N), phosphorus (P), and sulfur (S) on the biofortification of Se. In addition, we discuss interactions of Se with major toxicant metals (Hg, As, and Cd) frequently present in soil. We highlight key challenges in the quest to improve Se biofortification, with a focus on both agronomic practice and human health.

show abstract

“…In recent decades, mercury pollution has been commonly found in water, food, cosmetics, the atmosphere, and human health and poses a serious threat to the economy [106]. Contaminants of mercury exist in different forms in nature, such as elemental mercury, HgCl 2 , Hg 2 Cl 2 , methyl mercury (CH 3 Hg), and Hg(NH 2 )Cl.…”

Section: Mercury (Hg)mentioning

confidence: 99%

Rolling Circle Amplification as an Efficient Analytical Tool for Rapid Detection of Contaminants in Aqueous Environments

Zhang

Cao

et al. 2021

Biosensors

Self Cite

View full text Add to dashboard Cite

Environmental contaminants are a global concern, and an effective strategy for remediation is to develop a rapid, on-site, and affordable monitoring method. However, this remains challenging, especially with regard to the detection of various contaminants in complex water environments. The application of molecular methods has recently attracted increasing attention; for example, rolling circle amplification (RCA) is an isothermal enzymatic process in which a short nucleic acid primer is amplified to form a long single-stranded nucleic acid using a circular template and special nucleic acid polymerases. Furthermore, this approach can be further engineered into a device for point-of-need monitoring of environmental pollutants. In this paper, we describe the fundamental principles of RCA and the advantages and disadvantages of RCA assays. Then, we discuss the recently developed RCA-based tools for environmental analysis to determine various targets, including heavy metals, organic small molecules, nucleic acids, peptides, proteins, and even microorganisms in aqueous environments. Finally, we summarize the challenges and outline strategies for the advancement of this technique for application in contaminant monitoring.

show abstract

Bioaccumulation of Hg in Rice Leaf Facilitates Selenium Bioaccumulation in Rice (Oryza sativa L.) Leaf in the Wanshan Mercury Mine

Cited by 38 publications

References 65 publications

Methanogenesis Is an Important Process in Controlling MeHg Concentration in Rice Paddy Soils Affected by Mining Activities

Methanogenesis Is an Important Process in Controlling MeHg Concentration in Rice Paddy Soils Affected by Mining Activities

Selenium Biofortification and Interaction With Other Elements in Plants: A Review

Rolling Circle Amplification as an Efficient Analytical Tool for Rapid Detection of Contaminants in Aqueous Environments

Contact Info

Product

Resources

About