Arsenic Sequestration in Iron Plaque, Its Accumulation and Speciation in Mature Rice Plants (<i>Oryza Sativa</i> L.)

Liu, Wenjuan; Zhu, Yan; Hu, Ying; Williams, Paul N.; Gault, A. G.; Meharg, Andrew A.; Charnock, John; Smith, F. A.

doi:10.1021/es060800v

Cited by 408 publications

(249 citation statements)

References 37 publications

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“…25) and grain (0.15 ± 0.03−0.59 ± 0.09) parts. This finding is in agreement with the findings by Liu et al [19], Rahman et al [9] and Bhattacharya et al [8]. According to Liu et al [20] the iron oxides or iron plaques formed around root of the rice plant are responsible for the arsenic binding in root.…”

Section: Resultssupporting

confidence: 92%

Assessment of Arsenic Accumulation by Different Varieties of Rice (Oryza sativa L.) Irrigated with Arsenic-contaminated Groundwater in West Bengal (India)

Bhattacharya¹

2017

EPP

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Abstract.A study was conducted to investigate the bioaccumulation of arsenic by twelve different high yielding, hybrid and local rice varieties, cultivated in the Nadia district, West Bengal (India). The results showed that rice plant accumulated arsenic from irrigation water but, the magnitude of accumulation was found to vary with the rice varieties. Some of the examined rice varieties (like IET 4094, IR 50, etc) were noticed to be higher accumulator of arsenic (0.49 ± 0.05−0.59 ± 0.09 mg/kg dry weight) with respect to other varieties like Gaurishankar, Saltora, etc, which were detected to be comparatively low accumulator (0.15 ± 0.03−0.25 ± 0.01 mg/kg dry weight). While significant correlation (r = 0.9−0.92) was observed between arsenic concentrations in rice husk and grain parts, an appreciable low efficiency (TF = 0.08−0.19) was noticed in translocation of arsenic from root to straw.

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Section: Resultssupporting

confidence: 92%

Assessment of Arsenic Accumulation by Different Varieties of Rice (Oryza sativa L.) Irrigated with Arsenic-contaminated Groundwater in West Bengal (India)

Bhattacharya¹

2017

EPP

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“…The high levels of Cd, Zn, Pb, and As contained in iron plaque supports the general consensus that iron plaque has a high adsorption capacity for metal(loid)s (Liu et al 2006;Lei et al 2011). However, iron plaque sequestered less Cd and Pb after BCs amendment though Zn and As concentrations in iron plaque were not significantly influenced (Fig.…”

Section: Discussionsupporting

confidence: 58%

Mitigating heavy metal accumulation into rice (Oryza sativa L.) using biochar amendment — a field experiment in Hunan, China

Zheng

Chen

Cai

et al. 2015

Environ Sci Pollut Res

138

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A field experiment was conducted to investigate the effect of bean stalk (BBC) and rice straw (RBC) biochars on the bioavailability of metal(loid)s in soil and their accumulation into rice plants. Phytoavailability of Cd was most dramatically influenced by biochars addition. Both biochars significantly decreased Cd concentrations in iron plaque (35-81 %), roots (30-75 %), shoots (43-79 %) and rice grain (26-71 %). Following biochars addition, Zinc concentrations in roots and shoots decreased by 25.0-44.1 and 19.9-44.2 %, respectively, although no significant decreases were observed in iron plaque and rice grain. Only RBC significantly reduced Pb concentrations in iron plaque (65.0 %) and roots (40.7 %). However, neither biochar significantly changed Pb concentrations in rice shoots and grain. Arsenic phytoavailability was not significantly altered by biochars addition. Calculation of hazard quotients (HQ) associated with rice consumption revealed RBC to represent a promising candidate to mitigate hazards associated with metal(loid) bioaccumulation. RBC reduced Cd HQ from a 5.5 to 1.6. A dynamic factor's way was also used to evaluate the changes in metal(loid) plant uptake process after the soil amendment with two types of biochar. In conclusion, these results highlight the potential for biochar to mitigate the phytoaccumulation of metal(loid)s and to thereby reduce metal(loid) exposure associated with rice consumption.

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“…Arsenic sequestered in the rice rhizosphere was mainly in the form of As(V) by Fe hydroxide/ oxyhydroxide in root iron plaque and soil around the root. 8,40,41 Therefore, the increased microbial As(III) oxidation may contribute to such As sequestration in the rice rhizosphere. The rhizo-bag method was used to define the rhizosphere soil in this study.…”

Section: ■ Discussionmentioning

confidence: 99%

Arsenic Uptake by Rice Is Influenced by Microbe-Mediated Arsenic Redox Changes in the Rhizosphere

Jia

Huang

Chen

et al. 2014

Environ. Sci. Technol.

189

119

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Arsenic (As) uptake by rice is largely determined by As speciation, which is strongly influenced by microbial activities. However, little is known about interactions between root and rhizosphere microbes, particularly on arsenic oxidation and reduction. In this study, two rice cultivars with different radial oxygen loss (ROL) ability were used to investigate the impact of microbially mediated As redox changes in the rhizosphere on As uptake. Results showed that the cultivar with higher ROL (Yangdao) had lower As uptake than that with lower ROL (Nongken). The enhancement of the rhizospheric effect on the abundance of the arsenite (As(III)) oxidase gene (aroA-like) was greater than on the arsenate (As(V)) reductase gene (arsC), and As(V) respiratory reductase gene (arrA), resulting in As oxidation and sequestration in the rhizosphere, particularly for cultivar Yangdao. The community of As(III)-oxidizing bacteria in the rhizosphere was dominated by α-Proteobacteria and β-Proteobacteria and was influenced by rhizospheric effects, rice straw application, growth stage, and cultivar. Application of rice straw into the soil increased As release and accumulation into rice plants. These results highlighted that uptake of As by rice is influenced by microbial processes, especially As oxidation in the rhizosphere, and these processes are influenced by root ROL and organic matter application. ■ INTRODUCTIONArsenic (As) contamination and its health impacts are widespread around the world. 1,2 Large areas of paddy soils are contaminated by As due to irrigation with As-tainted groundwater, mining, and other industrial activities. Rice is particularly efficient in accumulating As, compared with other cereal crops, as a result of its anaerobic growth conditions. 3 This poses potential harm to people through ingestion of rice, especially in Southeast Asia where rice is consumed as the staple food. 4−6 Rhizospheric chemical processes, such as iron oxidation−reduction and iron plaque formation on root surfaces, play an important role in affecting As uptake by rice plants, and they are largely influenced by oxygen release from rice roots. 7,8 The aerated rice rhizosphere and O 2 -releasing root surface are usually coated with iron (Fe) and manganese (Mn) oxides, while As is precipitated with these oxides mainly as arsenate (As(V)). 8,9 In addition to chemical processes, As speciation and mobility in soils, sediments, and natural water systems are mainly driven by microbial transformations. 10−12 Anaerobic bacteria containing the respiratory reductase (ArrA) can use As(V) as the terminal electron acceptor in respiration and conserve energy from this process. 13 Another pathway for microbial As(V) reduction lies in the widespread As detoxification by As(V) reductase (ArsC). 14,15 Arsenite (As(III)) is more weakly bound to most soil minerals than As(V); thus, As(V) reduction results in As release into soil solutions, especially under anaerobic conditions such as paddy soil. 16,17 On the other hand, some heterotrophic as well a...

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Arsenic Sequestration in Iron Plaque, Its Accumulation and Speciation in Mature Rice Plants (Oryza Sativa L.)

Cited by 408 publications

References 37 publications

Assessment of Arsenic Accumulation by Different Varieties of Rice (Oryza sativa L.) Irrigated with Arsenic-contaminated Groundwater in West Bengal (India)

Assessment of Arsenic Accumulation by Different Varieties of Rice (Oryza sativa L.) Irrigated with Arsenic-contaminated Groundwater in West Bengal (India)

Mitigating heavy metal accumulation into rice (Oryza sativa L.) using biochar amendment — a field experiment in Hunan, China

Arsenic Uptake by Rice Is Influenced by Microbe-Mediated Arsenic Redox Changes in the Rhizosphere

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