Arsenic Uptake and Accumulation Mechanisms in Rice Species

Summary

This review synthesises current understanding of arsenic accumulation mechanisms in rice, a major dietary source of human exposure. It maps the molecular transporters involved in uptake of different arsenic species, identifies soil and agronomic factors that influence bioaccumulation, and evaluates mitigation approaches—finding microalgae and bacterial inoculants to be amongst the most effective agronomic strategies for reducing arsenic in rice grain.

UK applicability

United Kingdom rice consumption is not substantial, and domestic rice cultivation is limited; however, the findings on soil management practices (increasing organic matter and trace minerals) are broadly applicable to cereal production and food safety frameworks. UK food safety standards and import regulations may benefit from understanding arsenic accumulation mechanisms in rice sourced from high-risk regions such as Bangladesh and Taiwan.

Key measures

Arsenic species (AsV, AsIII, DMA, MMA) transport mechanisms; soil property effects (organic matter, sulphur, iron, manganese concentrations); arsenic accumulation levels in rice by geography; efficacy of microbial and algal mitigation strategies

Outcomes reported

The study identified molecular pathways and transporters responsible for arsenic species uptake in rice, mapped geographical variation in accumulation (higher in Taiwan and Bangladesh), and evaluated agronomic mitigation strategies. Key findings included the role of specific genes and soil properties in regulating arsenic accumulation, and the efficacy of microalgae and bacteria-based approaches in reducing uptake.

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