Effects of silicon (Si) on arsenic (As) accumulation and speciation in rice (Oryza sativa L.) genotypes with different radial oxygen loss (ROL)

Wu, Chuan; Qi, Zhang; Xue, Shengguo; Mo, Jing-yu; Pan, Wulue; Lou, Laiqing; Wong, Ming Hung

doi:10.1016/j.chemosphere.2015.06.081

Cited by 76 publications

(24 citation statements)

References 59 publications

(94 reference statements)

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“…Studies have demonstrated that ROL has profound influences on the rhizosphere environment including contaminant mobility (Wu et al, 2011. For example, Wu et al (2015) reported that root oxygenation greatly affected As mobility in soils whilst oxygenation followed by ROL contributed to the co-precipitation of Fe and heavy metals (Comer et al, 2003), increasing As in the amorphous and poorly-crystalline hydrous oxides of Fe and Al fraction in rhizosphere soils. In addition, the residual fraction which is associated with recalcitrant materials like sulfides (FeAsS) and organic matter , may become oxygenated by plant roots and microbial activity thereby converting Fe 2+ to Fe 3+ (Mei et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

“…The four rice genotypes ROL values are as follows, 9. 55, 15.41, 19.76 and 27.00 umol O2 g -1 root dry weight h -1 respectively (Wu et al, 2015). Rice seeds were sterilized (30% H2O2) for 15 min, and then thoroughly washed with deionized water.…”

Section: Methodsmentioning

confidence: 99%

“…Owing to possible conversion of arsenite to arsenate, the concentrations of inorganic As (iAs) were adopted to represent the concentrations of As(III) and As(V) (Wu et al, 2015). Inorganic As (78%-91%) was the predominant As species in rice straw ( Table 2).…”

Section: The Effect Of Si On As Speciation In Rice Plantsmentioning

confidence: 99%

“…Arsenic mobility, bioavailability, and toxicity largely depends on the chemical forms and types of binding (Novoa et al, 2007;Yang et al, 2016). In order to understand the bioavailability and toxicity of As to rice plants, As fractionation in soils must be understood (Li et al, 2007); this can be accomplished by using different extraction reagents, such as with sequential extraction procedures, to determine the chemical forms of As in soils (Wu et al, 2015). These procedures can also be used to predict changes in As mobility from various solid phases following amendment additions such as silicon (Si) (Wenzel et al, 2001).…”

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: 99%

Section: Methodsmentioning

confidence: 99%

Section: The Effect Of Si On As Speciation In Rice Plantsmentioning

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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“…However, these rapid developments have caused numerous environment issues (Clark et al 2015;Wu et al 2015) especially as China is the largest producer of alumina in the world (Si et al 2013;Liu et al 2014b). Bauxite residue (red mud) is an alkaline solid generated during the process of alumina production.…”

Section: Introductionmentioning

confidence: 99%

Proposal for management and alkalinity transformation of bauxite residue in China

Xue

Kong

Zhu

et al. 2016

Environ Sci Pollut Res

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128

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Bauxite residue is a hazardous solid waste produced during the production of alumina. Its high alkalinity is a potential threat to the environment which may disrupt the surrounding ecological balance of its disposal areas. China is one of the major global producers of alumina and bauxite residue, but differences in alkalinity and associated chemistry exist between residues from China and those from other countries. A detailed understanding of the chemistry of bauxite residue remains the key to improving its management, both in terms of minimizing environmental impacts and reducing its alkaline properties. The nature of bauxite residue and the chemistry required for its transformation are still poorly understood. This review focuses on various transformation processes generated from the Bayer process, sintering process, and combined Bayer-sintering process in China. Problems associated with transformation mechanisms, technical methods, and relative merits of these technologies are reviewed, while current knowledge gaps and research priorities are recommended. Future research should focus on transformation chemistry and its associated mechanisms and for the development of a clear and economic process to reduce alkalinity and soda in bauxite residue.

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Effect of arsenic on legumes: analysis in the model Medicago truncatula–Ensifer interaction

Pajuelo

Rodríguez‐Llorente

Caviedes

2019

The Model Legume Medicago Truncatula

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Effects of silicon (Si) on arsenic (As) accumulation and speciation in rice (Oryza sativa L.) genotypes with different radial oxygen loss (ROL)

Cited by 76 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

Proposal for management and alkalinity transformation of bauxite residue in China

Effect of arsenic on legumes: analysis in the model Medicago truncatula–Ensifer interaction

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