Summary
This review examines the widespread contamination of crops with non-essential toxic elements (cadmium, arsenic, and lead) and their contribution to chronic human dietary exposure. Drawing on molecular research in model systems and rice, the author discusses how advances in understanding transport and sequestration pathways enable the engineering of crops with substantially lower toxic element accumulation. The review emphasises that subtle genetic intervention—through both transgenic and gene editing approaches—offers a potentially rapid means to reduce human exposure to these contaminants, particularly through staple crops such as rice.
UK applicability
The findings are relevant to UK food safety policy and agricultural practice, particularly regarding rice imports and domestic cereal cultivation. However, the UK's temperate climate and soil types differ from those of major rice-growing regions, so local applicability depends on whether similar molecular mechanisms operate in UK-grown staples and on regulatory acceptance of gene-edited crops.
Key measures
Molecular pathways of toxic element (Cd, As, Pb) uptake and sequestration; potential reduction in human dietary exposure through crop breeding and genetic intervention
Outcomes reported
The review synthesises evidence on molecular mechanisms of cadmium, arsenic, and lead transport and accumulation in crops, with emphasis on rice as a major exposure pathway. It discusses the potential for transgenic and gene editing approaches to engineer crops with reduced toxic element accumulation in edible organs.
Topic tags
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