Selenium Characterization in the Global Rice Supply Chain

Williams, Paul N.; Lombi, Enzo; Sun, Guoxin; Scheckel, Kirk G.; Zhu, Yan; Feng, Xinbin; Zhu, Jianming; Carey, Anne-Marie; Adomako, Eureka; Lawgali, Youssef Y.; Deacon, Claire; Meharg, Andrew A.

doi:10.1021/es900671m

Cited by 195 publications

(149 citation statements)

References 37 publications

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“…Selenium is an essential trace element for humans and animals (Allan et al, 1999); selenium deficiency can lead or contribute to Keshan disease and Kashin-Beck disease, which have been reported in areas characterized by extremely low selenium content in the soil and food (Fordyce et al, 2000;Williams et al, 2009). Cereals and cereal products are the main source of dietary intake of selenium for populations living in the low selenium areas (Rayman, 2008).…”

Section: Discussionmentioning

confidence: 99%

Effect of selenium fertilization on the accumulation of cadmium and lead in rice plants

et al. 2014

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Background and Aims The accumulation of cadmium and lead in rice (Oryza sativa L.) grains is a potential threat to human health. In this study, the effect of selenium fertilization on the uptake and translocation of cadmium and lead in rice plants was investigated. Methods Rice plants were cultivated using cadmium and lead contaminated soils with selenium addition at three concentrations (0, 0.5 and 1 mg kg −1 ). At maturity, plants were harvested, and element concentrations in rice tissues were analyzed by using ICP-MS.Results Selenium application significantly increased seleniumaccumulationinricegrain,andmarkedlydecreased cadmium and lead concentrations in rice tissues. In brown rice grains, selenium application reduced cadmium concentrations by 44.4%, but had nosignificant effect onlead accumulation. Selenium application significantly decreased metal mobility in soils, at 0.5 mg kg −1 treatment, the translocation factor of cadmium and lead from soil to ironplaquedecreased by71and 33% respectively. Conclusions The mechanism of selenium mitigating of heavy metal accumulation in rice could be decreasing metal bioavailability in soil. Selenium fertilization could be an effective and feasible method to enrich selenium and reduce cadmium levels in brown rice.

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Section: Discussionmentioning

confidence: 99%

Effect of selenium fertilization on the accumulation of cadmium and lead in rice plants

et al. 2014

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“…In a recent global survey of Se in rice purchased from retail outlets [15], it was highlighted that Se levels in major rice-producing andconsuming countries, such as Egypt, China and Thailand, are low, whereas they were higher in rice from the USA and India. The concentration of Se in wheat also shows large regional variation [16].…”

Section: Selenium In the Environmentmentioning

confidence: 99%

Selenium in higher plants: understanding mechanisms for biofortification and phytoremediation

Zhu¹,

Pilon-Smits²,

Zhao³

et al. 2009

Trends in Plant Science

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Selenium (Se) is an essential micronutrient for many organisms, including plants, animals and humans. As plants are the main source of dietary Se, plant Se metabolism is therefore important for Se nutrition of humans and other animals. However, the concentration of Se in plant foods varies between areas, and too much Se can lead to toxicity. As we discuss here, plant Se uptake and metabolism can be exploited for the purposes of developing high-Se crop cultivars and for plant-mediated removal of excess Se from soil or water. Here, we review key developments in the current understanding of Se in higher plants. We also discuss recent advances in the genetic engineering of Se metabolism, particularly for biofortification and phytoremediation of Se-contaminated environments. Selenium in the environmentThe metalloid selenium (Se) is ubiquitous in the environment, and its concentration in most soils ranges from 0.01 to 2.0 mg kg, with a mean of 0.4 mg kg -1 ; however, higher concentrations (>10 mg kg -1

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“…In many countries, rice (Oryza sativa L.) was the major source of As intake because rice is the staple food for many populations (Li et al 2011;Rahman et al 2008) and is a highly efficient As accumulator under anaerobic conditions in paddy soil. Selenium (Se) is an essential micronutrient and has important benefits for human within the appropriate content (Williams et al 2009b). Cereals and cereal products such as rice are the main sources of dietary Se intake, so agronomic biofortification of food crops with Se fertilization is considered to be an effective way of improving Se intake for target populations (Hawkesford and Zhao 2007).…”

Section: Introductionmentioning

confidence: 99%

Interactive effects of different inorganic As and Se species on their uptake and translocation by rice (Oryza sativa L.) seedlings

Duan

Huang

et al. 2013

Environ Sci Pollut Res

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There is a lack of information on the interactive relationship of absorption and transformation between two inorganic arsenic (As) species and two inorganic selenium (Se) species in rice grown under hydroponic condition. Interactive effects of inorganic As (As(III)) and (As(V)) and Se (Se(IV)and Se(VI)) species on their uptake, accumulation, and translocation in rice (Oryza sativa L.) seedlings were investigated in hydroponic culture. The results clearly showed the interactive effects of inorganic As and Se on their uptake by rice. The presence of Se reduced the sum of As species in the rice shoots regardless of Se speciation. If Se is present as Se(IV), then is it is accompanied by a corresponding increase of the sum of As species, but if Se is present as Se(VI), then there is no change in the sum of As species in rice roots. These effects are observed regardless of initial As speciation. When the rice plants are exposed to Se(IV), the presence of As increases the sum of Se species in the roots, and decreases the sum of Se species in the corresponding shoots. This effect is more pronounced for As(III) than for As(V). There is no effect on Se during exposure to Se(VI). Co-existence of As also increased SeMet in rice roots.

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Selenium Characterization in the Global Rice Supply Chain

Cited by 195 publications

References 37 publications

Effect of selenium fertilization on the accumulation of cadmium and lead in rice plants

Effect of selenium fertilization on the accumulation of cadmium and lead in rice plants

Selenium in higher plants: understanding mechanisms for biofortification and phytoremediation

Interactive effects of different inorganic As and Se species on their uptake and translocation by rice (Oryza sativa L.) seedlings

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