Silicon decreases the arsenic level in rice grain by limiting arsenite transport

Fleck, Alexander; Mattusch, Jürgen; Schenk, M.

doi:10.1002/jpln.201200440

Cited by 119 publications

(59 citation statements)

References 59 publications

(99 reference statements)

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“…Silicon can also alleviate the toxicity of contaminants such as As in rice (Fleck et al, 2013). The beneficial effects of Si on plant growth have been observed in previous studies by Li et al (2009a) and Fleck et al (2013) who reported that Si addition increased rice straw and grain yields. Results from this investigation have demonstrated that Si application significantly increased root (p<0.05) and grain biomass (p<0.001) (Figure 1).…”

Section: Discussionmentioning

confidence: 71%

“…Numerous studies have shown that silicate (Si) application not only increases rice yield, but also suppresses uptake and accumulation of As in rice grains, though Si was not considered as an essential element of rice (Li et al, 2009a;Seyfferth and Fendorf, 2012;Fleck et al, 2013). In flooded soils, rice is inherently efficient at taking up and transferring As(III) (Su et al, 2010) due to the translocation of As (III) into rice via silicon transport systems (transporters Lis1 and Lsi 2) as a silicon acid analogue (Ma et al, 2006(Ma et al, ,2008Chen et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Consequently competition for uptake and translocation between Si and As(III) occurs, and hydroponic experiments have demonstrated that addition of Si reduced As uptake and accumulation in rice (Guo et al, 2005(Guo et al, ,2007Tripathi et al, 2013). Fleck et al (2013) reported that Si application reduced As concentrations by 22% in brown and polished rice grains by suppressing As(III) transport. Li et al (2009a) revealed that Si addition reduced iAs concentrations by 59% and increased DMA concentrations by 39% in rice grains.…”

Section: Introductionmentioning

confidence: 99%

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Effect of silicate on arsenic fractionation in soils and its accumulation in rice plants

Xue

et al. 2016

Chemosphere

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Four rice genotypes, two hybrid and two indica, were selected to investigate the effects of silicate (Si) application on arsenic (As) accumulation and speciation in rice and As fractionation in soil. There were significant differences in root, straw and grain biomass between genotypes (p<0.05), and Si application significantly increased root (p<0.05) and grain biomass (p<0.001). Silicate addition reduced the proportion of As associated with well-crystallized hydrous oxides of Fe and Al and residual phases, whilst increasing the proportions of specifically-sorbed As and As associated with amorphous and poorly-crystalline Fe and Al hydrous oxides. Furthermore, the results indicated that the fraction proportions of non-specifically sorbed, specifically-sorbed, and associated with amorphous and poorly-crystalline hydrous oxides of Fe and Al in rhizosphere soils, were greater than non-rhizosphere soils. Silicate application had a significant effect decreasing total As concentrations in root (p<0.005), straw (p<0.05) and husk (p<0.001) of rice plants. The effect of Si on reducing As accumulation in rice leaves was revealed by SXRF. Indica genotypes transported and accumulated less As than hybrid genotypes. Both percentage and concentration of iAs were lower in indica genotype XFY-9 than in hybrid genotype XWX-12. Silicate reduced iAs and DMA by 21% and 58% respectively in polished grain. DMA may have a greater translocation capacity from straw to polished grain than inorganic As. The study provides the potential for understanding As uptake mechanisms in rice and mitigating the health risks posed by As contamination in paddy fields.

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Section: Discussionmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of silicate on arsenic fractionation in soils and its accumulation in rice plants

Xue

et al. 2016

Chemosphere

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“…Compared with the NPK treatment, NP+S-KSi900, NP+S-KSi9000, and NPK+ CaSi9000 treatments significantly reduced As concentration in rice grain. This inhibitory effect of Si is supported by many laboratory experiments (Bogdan and Schenk 2008;Li et al 2009;Fleck et al 2013;Tripathi et al 2013). Areao et al (2009) reported that the soil Eh value decreased rapidly during the flooded period.…”

Section: Discussion Effect Of Si On As Concentration In Rice Grainmentioning

confidence: 74%

Mitigation of cadmium and arsenic in rice grain by applying different silicon fertilizers in contaminated fields

Wang

Wen

Chen

et al. 2015

Environ Sci Pollut Res

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A field experiment was established to support the hypothesis that application of different silicon (Si) fertilizers can simultaneously reduce cadmium (Cd) and arsenic (As) concentration in rice grain. The Bsemi-finished product of Si-potash fertilizer^treatment at the high application of 9000 kg/ha (NP+S-KSi9000) significantly reduced the As concentration in rice grain by up to 20.1 %, compared with the control. Si fertilization reduces the Cd concentration in rice considerably more than the As concentration. All Si fertilizers apart from sodium metasilicate (Na 2 SiO 3 ) exhibited a high ability to reduce Cd concentration in rice grain. The Sicalcium (CaSi) fertilizer is the most effective in the mitigation of Cd concentration in rice grain. The CaSi fertilizer applied at 9000 kg/ha (NPK+CaSi9000) and 900 kg/ha (NPK+CaSi900) reduced the Cd concentration in rice grain about 71.5 and 48.0 %, respectively, while the Si-potash fertilizer at 900 kg/ ha (NP+KSi900), the semi-finished product of Si-potash fertilizer at both 900 kg/ha (NP+S-KSi900) and 9000 kg/ha (NP+S-KSi9000), and the rice straw (NPK+RS) treatments reduced the Cd concentration in rice grain about 42, 26.5, 40.7, and 23.1 %, respectively. The results of this investigation demonstrated the potential effects of Si fertilizers in reducing Cd and As concentrations in rice grain.

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“…Arsenite, the most prevalent form of arsenic in flooded rice paddies, is a silicic acid analogue, and is taken up by rice roots due to its similarity to silicic acid [205,206,214,304,305]. Several authors have shown that when excess silicon is available in the soil or in hydroponic culture, arsenic uptake and translocation to plant shoots and rice grain are reduced [207,210,214,306,307]. Organic forms of arsenic also are taken up by rice, via the silicic acid pathway [207,305].…”

Section: Silicon In Soilsmentioning

confidence: 99%

Managing Water and Soils to Achieve Adaptation and Reduce Methane Emissions and Arsenic Contamination in Asian Rice Production

Wichelns

2016

Water

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Rice production is susceptible to damage from the changes in temperature and rainfall patterns, and in the frequency of major storm events that will accompany climate change. Deltaic areas, in which millions of farmers cultivate from one to three crops of rice per year, are susceptible also to the impacts of a rising sea level, submergence during major storm events, and saline intrusion into groundwater and surface water resources. In this paper, I review the current state of knowledge regarding the potential impacts of climate change on rice production and I describe adaptation measures that involve soil and water management. In many areas, farmers will need to modify crop choices, crop calendars, and soil and water management practices as they adapt to climate change. Adaptation measures at the local, regional, and international levels also will be helpful in moderating the potential impacts of climate change on aggregate rice production and on household food security in many countries. Some of the changes in soil and water management and other production practices that will be implemented in response to climate change also will reduce methane generation and release from rice fields. Some of the measures also will reduce the uptake of arsenic in rice plants, thus addressing an important public health issue in portions of South and Southeast Asia. Where feasible, replacing continuously flooded rice production with some form of aerobic rice production, will contribute to achieving adaptation objectives, while also reducing global warming potential and minimizing the risk of negative health impacts due to consumption of arsenic contaminated rice.

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Silicon decreases the arsenic level in rice grain by limiting arsenite transport

Cited by 119 publications

References 59 publications

Effect of silicate on arsenic fractionation in soils and its accumulation in rice plants

Effect of silicate on arsenic fractionation in soils and its accumulation in rice plants

Mitigation of cadmium and arsenic in rice grain by applying different silicon fertilizers in contaminated fields

Managing Water and Soils to Achieve Adaptation and Reduce Methane Emissions and Arsenic Contamination in Asian Rice Production

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