Variation in grain arsenic assessed in a diverse panel of rice (<i>Oryza sativa</i>) grown in multiple sites

Norton, Gareth J.; Pinson, Shannon R. M.; Alexander, J.H.; McKay, Susan; Hansen, Hanna E.; Duan, Guilan; Islam, Md. Rafiqul; Islam, S.M. Rafiqul; Stroud, Jacqueline L.; Zhao, Fang‐Jie; McGrath, Steve P.; Zhu, Yan; Lahner, Brett; Yakubova, Elena; Guerinot, Mary Lou; Tarpley, Lee; Eizenga, G. C.; Salt, David E.; Meharg, Andrew A.; Price, Adam H.

doi:10.1111/j.1469-8137.2011.03983.x

Cited by 127 publications

(114 citation statements)

References 48 publications

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“…In addition, silica and phosphate fertilizations can be applied in soil to decrease As accumulation in rice, dependent on soil conditions [16]. Another tack would be the selection of rice cultivars with low accumulation of As in grains [40]. To be a success on the farm, any new cultivars will have to have decent yields.…”

Section: Resultsmentioning

confidence: 99%

Mechanisms Controlling Arsenic Uptake in Rice Grown in Mining Impacted Regions in South China

Dong

Lü

et al. 2014

PLoS ONE

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Foods produced on soils impacted by Pb-Zn mining activities are a potential health risk due to plant uptake of the arsenic (As) associated with such mining. A field survey was undertaken in two Pb-Zn mining-impacted paddy fields in Guangdong Province, China to assess As accumulation and translocation, as well as other factors influencing As in twelve commonly grown rice cultivars. The results showed that grain As concentrations in all the surveyed rice failed national food standards, irrespective of As speciation. Among the 12 rice cultivars, “SY-89” and “DY-162” had the least As in rice grain. No significant difference for As concentration in grain was observed between the rice grown in the two areas that differed significantly for soil As levels, suggesting that the amount of As contamination in the soil is not necessarily the overriding factor controlling the As content in the rice grain. The iron and manganese plaque on the root surface curtailed As accumulation in rice roots. Based on our results, the accumulation of As within rice plants was strongly associated with such soil properties such as silicon, phosphorus, organic matter, pH, and clay content. Understanding the factors and mechanisms controlling As uptake is important to develop mitigation measures that can reduce the amount of As accumulated in rice grains produced on contaminated soils.

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Section: Resultsmentioning

confidence: 99%

Mechanisms Controlling Arsenic Uptake in Rice Grown in Mining Impacted Regions in South China

Dong

Lü

et al. 2014

PLoS ONE

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“…The EU limit is based on inorganic arsenic content rather than total arsenic content; as the proportion of inorganic arsenic was not measured in this study, it is not directly possible to conclude if the ash treatment causes the EU limit to be exceeded. However, based on the literature (Norton et al 2009(Norton et al , 2012, if 80% of the total arsenic in rice grains in the present study is inorganic arsenic, then the grains obtained would be above the limit.…”

Section: Implications For Risk Assessmentmentioning

confidence: 99%

“…This high soil arsenic concentration could be one of the factors that caused the plants to die in the highest ash treatment, as high arsenic concentrations have been linked to phytotoxicity (Meharg and Hartley-Whitaker 2002). Under flooded conditions, it would be expected that arsenic in the pore water would have increased (Xu et al 2008) and this could have led to plants grown under flooded conditions accumulating an order of magnitude more arsenic (Xu et al 2008;Norton et al 2012Norton et al , 2013. While there was a significant effect of flooding on pore water arsenic concentrations (Table 2) and a significant effect of flooding on shoot arsenic, with plants grown under flooded conditions having higher shoot arsenic concentrations compared to those grown under non-flooded conditions (Fig.…”

Section: Arsenic In Pore Water and Ricementioning

confidence: 99%

“…Additionally, rice cultivation approaches can include periods of both dry and flooded soil and the transition between aerobic (or partially aerobic) and anaerobic conditions further complicates predictability of metal(loid) behaviour. For example, arsenic, iron and manganese become more available to plants under anaerobic conditions compared to aerobic conditions (Xu et al 2008;Norton et al 2012Norton et al , 2013Rinklebe et al 2016). This is in contrast to elements like cadmium, copper and strontium, whose mobility is reduced in oxygen limited soils (Rinklebe et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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The Impacts of Applying Metal(loid) Enriched Wood Ash to Soils on the Growth and Elemental Accumulation of Rice

et al. 2018

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The mobility and uptake of phosphorus, manganese, arsenic, copper, zinc and several other heavy metal(loid)s to rice shoots and grains were measured under controlled irrigation [flooded and non-flooded] conditions in a pot experiment. Doses of 0.1-1% (w:w) of a metal(loid)-rich wood ash containing ≤ 13,000 mg kg −1 phosphorus, manganese, arsenic, copper and zinc were applied to a study soil to determine the impacts of the ash on rice grain quality and the fate of metal(loid)s. Pore water and rice shoots and grains were analysed for beneficial and toxic elements derived from the ash, and Food-chain exposure modelling was applied to the experimental data thereafter to predict risk of onward impacts to human health. Concentrations of phosphorus and manganese in pore water increased with ash addition, though this did not enhance grain phosphorus or manganese. Zinc mobility was largely reduced over the course of the experiment, but appeared unrelated to ash dose. Arsenic presented the greatest mobility in pore water of all measured metal(loid)s (~ 2500 µg l −1 ), with shoot concentrations displaying clear dose and irrigation response. Although rice concentrations of arsenic in grain were the lowest of all measured metal(loid)s, risk-modelling of the data showed that even a 0.1% addition of the study ash to soil could expose a high rice consuming cohort to a vastly increased probability of deleterious health impacts. Whilst it is unlikely that contaminated ash would be knowingly applied to land, this study highlights that even singular applications of metal(loid) rich ash to agricultural soils could have negative effects on crops and forward impacts to human health. Other application scenarios, whereby lesser contaminated ashes are repeatedly applied to soils, warrant further work with regard to potential risks of accumulated metal(loid)s entering the food chain.

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“…However, the toxic effects of As may cause high susceptibility in some cultivars than others. The genotypic variation in the different cultivars for arsenic concentration, as a strategy to reduce the movement of As from contaminated soils to edible parts of crop plants has been receiving close attention (Norton et al, 2012). Researchers have developed the arsenic stress toxicity tolerant rice cultivars through locally-grown rice cultivars in Bangladesh, India and China (Norton et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Study on Genetic Variation of Arsenic Concentration in 32 Different Genotypes of Leafy Vegetable

Kumwimba¹,

Zeng²,

Bai³

et al. 2014

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Leafy vegetables are a food crop with higher protein and are also important source of minerals which are essential for good health. Due to the large consumption, it is necessary to decrease the arsenic (As) concentration in leafy vegetable to avoid the potential risk to human health. The current study is aimed at assessing arsenic (As) accumulation ability and identification of cultivars with less As concentration that could be grown in As contaminated farmland for food safety. A set of thirty two leafy vegetable cultivars from 5 species were compared in hydroponics for 2 weeks having moderate level of 0-control and 6 mg As L -1 . At harvest, plants were sampled and analyzed for As concentration. Significant genotypic variations were observed in the shoots As concentration, translocation and bioaccumulation factors revealing more than 8 and 25 times cultivar differences in shoot As concentration, and in translocation factors respectively. This result revealed that As concentration in shoot was in part governed by the greater ability of root-shoot translocation. Cultivar Sijibaiye (SJBY) had the lowest shoot As concentration while the highest was detected in Dayekongxincai (DYKXC). The average As concentration in roots were found to be ten to twenty times higher than those observed in shoots, indicating that there is restricted transport of As from the root system to the shoot of cultivars. Therefore, it has been suggested that there is possibility to lower the As concentration in leafy vegetables by selecting and breeding cultivars with less As concentration that can be safely grown in contaminated soils with the slight and moderate levels of As for safe consumption.

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Variation in grain arsenic assessed in a diverse panel of rice (Oryza sativa) grown in multiple sites

Cited by 127 publications

References 48 publications

Mechanisms Controlling Arsenic Uptake in Rice Grown in Mining Impacted Regions in South China

Mechanisms Controlling Arsenic Uptake in Rice Grown in Mining Impacted Regions in South China

The Impacts of Applying Metal(loid) Enriched Wood Ash to Soils on the Growth and Elemental Accumulation of Rice

A Preliminary Study on Genetic Variation of Arsenic Concentration in 32 Different Genotypes of Leafy Vegetable

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