Selenium addition alters mercury uptake, bioavailability in the rhizosphere and root anatomy of rice (Oryza sativa)

Wang, Xun; Tam, N.F.Y.; Fu, Shi; Ametkhan, Aray; Ouyang, Yong; Ye, Zhihong

doi:10.1093/aob/mcu117

Cited by 69 publications

(26 citation statements)

References 44 publications

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“…The presence of chlorosis decreased significantly with increasing Se additions. These results are in line with those for Wang et al (2014), who documented significant increase in brown rice yield after adding 5 mg sodium selenite per kg of Hg-contaminated soil.…”

Section: Do Sodium Selenite Additions Change the Toxicity Of Hg And Asupporting

confidence: 91%

“…The decreased toxicity of Hg in plants in the presence of Se has been suggested to be due to reduced bioavailability of Hg and consequently reduced production of MeHg in the rhizosphere, suppression of uptake of Hg into the rootcells and an enhancement of the development of apoplastic barriers in the endodermis of the roots (Wang et al 2014). A recent study by Wang et al 2016 confirmed the formation of Hg-Se complexes in soils (detected by TEM-EDX and XANES) and thus reduced microbial MeHg production.…”

Section: Do Sodium Selenite Additions Change the Toxicity Of Hg And Amentioning

confidence: 98%

“…Therefore, the statisticall significant deceased plant toxicity and deceased bioaccumulation of Hg and As in worms with increasing [Se] cannot be explained by changes in the exchangeable CaCl 2 -extractable fractions of Hg and As in the soil. However, a study by Wang et al (2014) found that the [MeHg] as well as the 'water-soluble' fraction of Hg in the rhizosphere was significantly reduced by the addition of Se. They hypothesized that Se amendment enhanced the immobilization of Hg in the soil, leading to lower Hg bioavailability and restricting the production of MeHg.…”

Section: Do Sodium Selenite Additions Change the Toxicity And Bioaccumentioning

confidence: 99%

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Can a Low-Dose Selenium (Se) Additive Reduce Environmental Risks of Mercury (Hg) and Arsenic (As) in Old Gold Mine Tailings?

Chapman¹,

Robinson²,

Berry

et al. 2016

Water Air Soil Pollut

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Selenium (Se) has long been known as an effective antagonist for counteracting mercury (Hg) and arsenic (As) toxicity in many animal and plant species. This study is the first to assess a low-dose Se additive as an in situ remediation tool for As-and Hgcontaminated gold mine tailing material. Mine tailing material from an 1860s gold mine stamp mill site was treated with different concentrations of sodium selenite (0, 0.5, 1, 3, 8, and 15 mg Se/kg). Reclamation grass seeds planted in each treatment showed significantly decreased plant toxicity with increasing [Se], as measured by increases in biomass, % emergence, and root lengths. Leachate was collected from each pot after the grass was harvested. The lowest Hg and As concentrations measured in the leachate were associated with the 1 mg Se/kg treatment (94 and 71 % lower than concentrations in leachate from untreated tailing material) and increased with lower and higher Se treatments. Finally, earthworms (Eisenia andrei) were introduced to the experimental treatments. Earthworm [Hg] decreased with increasing [Se], but this effect was confounded by differing [Hg] in the tailing material. Earthworm [As] decreased with [Se] up to 3 mg Se/kg, then earthworm [As] increased with tailing [Se]. This experiment confirms that low-dose selenium additions (up to 3 mg Se/ kg tailing material) can have beneficial effects by limiting toxicity and mobility of As and Hg from the tailing material for both grass and earthworms.

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Section: Do Sodium Selenite Additions Change the Toxicity Of Hg And Asupporting

confidence: 91%

Section: Do Sodium Selenite Additions Change the Toxicity Of Hg And Amentioning

confidence: 98%

Section: Do Sodium Selenite Additions Change the Toxicity And Bioaccumentioning

confidence: 99%

See 1 more Smart Citation

Can a Low-Dose Selenium (Se) Additive Reduce Environmental Risks of Mercury (Hg) and Arsenic (As) in Old Gold Mine Tailings?

Chapman¹,

Robinson²,

Berry

et al. 2016

Water Air Soil Pollut

View full text Add to dashboard Cite

show abstract

“…Recently, there is growing evidence that selenium (Se) could efficiently reduce Hg accumulation in rice plants (i.e., Hg-Se antagonism, Zhang et al 2012;Zhao et al 2014;Wang et al 2014a;Li et al 2015). It is proposed that the formation of Hg-Se complexes in soil and/or high molecular weight Hg-Se complexes in rice root could be responsible for the observed Hg-Se antagonism.…”

Section: Introductionmentioning

confidence: 99%

Amendment of sulfate with Se into soils further reduces methylmercury accumulation in rice

et al. 2016

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Purpose Both selenium (Se) and sulfate could largely affect methylmercury (MeHg) dynamics and phytoavailability in soil-rice systems, while their combined effects are less understood. Here, we aimed at exploring the potential effects of sulfate on MeHg accumulation in rice in the presence of Se. Materials and methods Rice was cultivated in inorganic Hgspiked soils amended with Se only (selenite/selenate, BSe treatments^) or Se and sulfate (BSe + Sulfate treatments^). Soil parameters (e.g., pH and redox potential (Eh)), MeHg concentrations in soils, as well as MeHg or Se accumulation in rice plants were quantified during the rice growth period. Results and discussion Soil MeHg concentrations were generally comparable between Se + Sulfate and Se treatments. However, MeHg uptake by rice plants in Se + Sulfate treatments was 9-31 % lower than those in Se treatments, possibly due to the increased soil pH and formation of iron sulfides, which may reduce MeHg phytoavailability under sulfate amendment. Furthermore, sulfate input enhanced Se accumulation in root (especially in the presence of selenate), which could be responsible for the increased MeHg distribution in root and thus lower MeHg distribution in grain. Consequently, the reduced plant uptake of MeHg together with the decreased MeHg distribution in grain resulted in decline of grain MeHg concentrations in Se + Sulfate treatments (8-31 % lower compared to Se treatments). Conclusions Our results suggest that sulfate input with Se could further reduce MeHg accumulation in rice, which improved mechanistic understanding of MeHg behaviors in soilrice systems.

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“…The main strategies used by plants to tolerate and minimize detrimental effects of high metal concentrations are to restrict uptake, limit translocation or detoxify through chelation and subcellular compartmentalization to avoid accumulation in the whole plant (Jan and Parray 2016). Root related mechanisms, which may contribute to the Cd reduction uptake, could be an enhanced development of apoplastic barriers in the endodermis of roots and a lower activity of the membrane transporters activity (Wang et al 2014). Moreover, more lignin and thicker cell walls may be formed in cells being exposed to Se (Cui et al 2018) and therefore restrict the translocation of Cd that will be adsorbed.…”

Section: Discussionmentioning

confidence: 99%

Can Cd content in crops be controlled by Se fertilization? A meta-analysis and outline of Cd sequestration mechanisms

2019

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Aim Cadmium mitigation in crops is a worldwide concern. Selenium application has been suggested as a potential solution to reduce cadmium concentration in plants, but published results were contradictory. We analysed literature data with respect to the effect of selenium addition on cadmium uptake and elucidated processes possibly involved. Method A meta-analysis was performed on data collected from previously published studies presenting cadmium concentration in plants subjected to selenium treatments. Metaregression random models were run to test the impact of different factors. In addition, soil and crop inventory data exemplifying the natural variation of Cd and Se in soil were evaluated. Results The results highlighted a significant reduction of cadmium concentration in crops after selenium addition. The reduction was dose-dependent for crops growing under aerobic, but not for plants cultivated under anoxic conditions such as rice. This suggests that different process can be involved. Conclusion We demonstrated the potential of selenium fertilization to mitigate cadmium uptake and highlighted that for non-rice species, the main process seems to take place in the soil, while mechanisms in roots restricting uptake may be involved for all crops. The inventory data also indicated an impact of natural soil Se on Cd contents in crops.

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Selenium addition alters mercury uptake, bioavailability in the rhizosphere and root anatomy of rice (Oryza sativa)

Cited by 69 publications

References 44 publications

Can a Low-Dose Selenium (Se) Additive Reduce Environmental Risks of Mercury (Hg) and Arsenic (As) in Old Gold Mine Tailings?

Can a Low-Dose Selenium (Se) Additive Reduce Environmental Risks of Mercury (Hg) and Arsenic (As) in Old Gold Mine Tailings?

Amendment of sulfate with Se into soils further reduces methylmercury accumulation in rice

Can Cd content in crops be controlled by Se fertilization? A meta-analysis and outline of Cd sequestration mechanisms

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