Combined climate change and arsenic pollution increases rice cadmium with little effect on micronutrients

Summary

This pot experiment investigated how combined soil arsenic contamination and climate change factors (elevated CO₂ and temperature) affect the nutritional quality and safety of rice grain. Whilst grain zinc decreased by 25% under combined stress, grain cadmium concentrations more than doubled, driven primarily by future climate conditions rather than arsenic contamination alone. The results highlight the complex, non-additive interactions between environmental stressors in determining rice grain composition, with implications for food safety and nutritional adequacy in arsenic-affected regions facing climate change.

Regional applicability

The findings have global relevance for rice-growing regions with existing arsenic contamination in soils, particularly in South and Southeast Asia. Applicability to United Kingdom agriculture is limited, as rice is not a commercial crop in the UK, though the mechanistic insights may inform understanding of cadmium and micronutrient dynamics in UK cereals under future climate scenarios.

Key measures

Grain iron (Fe), zinc (Zn), and cadmium (Cd) concentrations; soil arsenic (As) levels; atmospheric CO₂ concentration (+435 ppm); temperature (+5°C)

Outcomes reported

The study measured grain iron, zinc, and cadmium concentrations in rice grown under factorial combinations of soil arsenic contamination and climate conditions (elevated CO₂, elevated temperature, or both). Combined soil arsenic pollution and future climate conditions led to a 25% decrease in grain zinc but a two-fold increase in grain cadmium, with iron largely unaffected.

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