Is the effect of silicon on rice uptake of arsenate (AsV) related to internal silicon concentrations, iron plaque and phosphate nutrition?

Guo, Wei; Zhu, Yan; Liu, W.-J.; Liang, Yongchao; Geng, Chang‐An; Wang, S.-G.

doi:10.1016/j.envpol.2006.10.021

Cited by 89 publications

(43 citation statements)

References 30 publications

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“…Our results indicated that adding Si reduced As concentrations in rice roots (p<0.005), straw (p<0.05), husks (p<0.001) and grain (Table 2). This was in agreement with previous studies, showing that Si addition significantly reduced As concentrations in rice roots and shoots grown in solution cultures ( (Guo et al, 2005(Guo et al, , 2007Tripathi et al, 2013). Fleck et al (2013) reported that Si application limited As(III) uptake and translocation into shoots and subsequent transportation into grain.…”

Section: Discussionsupporting

confidence: 83%

“…Transporter Lis1 acts as a major uptake channel for As(III) in rice plants and Lsi 2 plays an essential role in mediating As(III) translocation to shoots and subsequent accumulation in the grains (Ma et al, 2006(Ma et al, , 2008. 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.…”

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: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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

Xue

et al. 2016

Chemosphere

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“…Silicates are also well known to be effective in alleviating arsenic (As) stress in rice (Bogdan and Schenk 2008;2009;Guo et al 2005;Ma et al 2008). It has been shown that arsenite uptake by rice seedlings is affected by Si both external and internal plant (Guo et al 2007). However, the mechanisms involved in the alleviation effect of Si on uptake of As are so far not clear.…”

Section: Introductionmentioning

confidence: 99%

Silicon-mediated amelioration of zinc toxicity in rice (Oryza sativa L.) seedlings

et al. 2011

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Background and aims Silicon (Si) was suggested to enhance plant resistance to toxic elements, and its beneficial role was mainly based on external and internal plant mechanisms. This work aimed at investigating the internal effect of Si on zinc (Zn) detoxification to rice (Oryza sativa L., cv. Tian You 116) seedlings. Methods In a hydroponic experiment, we examined the uptake, xylem loading and localization of Zn in rice seedlings under the condition of 200 μM Zn contamination with the additional silicate supply at three levels ( 0, 0.5 and 1.8 mM).Results The silicate addition significantly increased the seedling biomass, and decreased Zn concentration in both root and shoot of seedlings and in xylem sap flow. Zinpyr-1 fluorescence test and Energy-dispersive X-ray spectroscopy analysis showed the concentration of biologically active Zn 2+ decreased, and Zn and Si co-localized in the cell wall of metabolically less active tissues, especially in sclerenchyma of root. The fractionation analysis further supported silicate supply increased about 10% the cell wall bound fraction of Zn. Conclusions This study suggests the Si-assisted Zn tolerance of rice is mainly due to the reduction of uptake and translocation of excess Zn, and a stronger binding of Zn in the cell wall of less bioactive tissues might also contribute to some degree.

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“…The discrepancy in the results demonstrates that root fertilization and foliage dressing of Se may result in different effects on the contents of various nutrients in rice grains. Foliage dressing or root fertilization with Si and Se fertilizers has been reported to reduce crop uptake of As and Cd (Neumann and Zur Nieden, 2001;Guo et al, 2007;Feng et al, 2013a,b,c), contributing to yield enhancement (Hu et al, 2002;Singh et al, 2005). However, foliage dressing with Se and Si did not significantly affect the grain yields of rice in the present study.…”

Section: Discussionmentioning

confidence: 99%

Performances of Water Management, Foliage Dressing, and Variation Screening in Controlling the Accumulation of As and Cd and Maintaining the Concentrations of Essential Elements in the Grains of Rice Plant

Lei

Yu³

et al. 2018

Front. Environ. Sci.

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This study was conducted to understand why and how the technologies of variety screening, foliar dressing, and water management can reduce As/Cd accumulation and affect the concentrations of essential elements in different rice plants. In Trial I (variety screening), the grain As and Cd concentrations in Zhongguyou1361 variety (P3) were both lower than their individual National Food Hygiene Standard of China (NFHSC) under insufficient field drying condition. The P3 also had a relatively high yield and high essential element contents among 15 selected rice varieties. In Trial II (foliar dressing), selenite foliar spray showed a better ability than silicate to reduce the grain As content in Guangliangyou1128 variety (P1). However, spraying Se and Si onto the Fengliangyou1 variety (P2) both showed a limited effect on the grain As and Cd contents, suggesting a different effect of Se on grain As content in various rice varieties. The insufficient field drying in Trial II resulted in the grain Cd content being lower but the grain As content being higher than their individual NFHSC in both P1 and Fengliangyou1 (P2) varieties. Se or Si did not affect the yields and the grain contents of most essential elements in P1 and P2. In Trial III (water management), increasing field drying time enhanced the Cd content but reduced the As content in the grains of P1, P2, and P3, and maintained their yields. Similar to the results of Trial II, the changes in soil pH, organic matter concentration and elemental available concentrations could hardly be used to explain why the contents of corresponding essential elements kept approximately constant in the grains of different rice varieties. Foliar dressing with selenite combined with water regulation can simultaneously reduce the As and Cd contents, and maintain the yields and the essential element contents in the grains of rice plants cultivated in As − and Cd − contaminated soil.

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Is the effect of silicon on rice uptake of arsenate (AsV) related to internal silicon concentrations, iron plaque and phosphate nutrition?

Cited by 89 publications

References 30 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

Silicon-mediated amelioration of zinc toxicity in rice (Oryza sativa L.) seedlings

Performances of Water Management, Foliage Dressing, and Variation Screening in Controlling the Accumulation of As and Cd and Maintaining the Concentrations of Essential Elements in the Grains of Rice Plant

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