Divergent mechanisms of zinc and manganese in controlling cadmium transfer to rice grain: from big data to field verification.
Liu R, Pan S, Liu X, Luo L, Zhong Z
Phytoremediation
Rice grown in contaminated southern Chinese soils is a leading global source of dietary cadmium exposure — and these field trials show that farmers can cut grain cadmium by more than half simply by amending soil with common zinc or manganese compounds.
Cadmium is a toxic heavy metal that rice plants can absorb from polluted soil and concentrate in the grain we eat. Scientists found that adding zinc or manganese to contaminated paddy fields dramatically reduces how much cadmium ends up in rice — but in surprisingly different ways: zinc blocks the plant from moving cadmium from its stems into the grain, while manganese stops the plant from absorbing cadmium through its roots in the first place. This gives farmers two distinct, practical tools to protect rice crops depending on what's needed.
Key Findings
Soil application of zinc reduced grain cadmium concentrations by 51.9–78.8% across field trials, without affecting root uptake — it specifically blocked cadmium remobilization from straw to grain.
Manganese amendment reduced grain cadmium by 69.6–84.4% through a broader systemic effect, simultaneously inhibiting both root cadmium uptake and its translocation throughout the plant.
Two consecutive years of field trials (2023–2024) confirmed that large-scale survey correlations between soil zinc/manganese levels and lower grain cadmium are causal, not coincidental.
chevron_right Technical Summary
Adding zinc or manganese to cadmium-contaminated rice paddies can cut the amount of cadmium reaching the grain by 52–84%, but the two minerals work through completely different biological pathways to achieve this result.
Abstract Preview
Cadmium (Cd) contamination in rice poses a serious threat to food safety, particularly in acidic paddy fields of southern China. Large-scale field surveys have revealed negative correlations betwee...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Species Mentioned
Was this useful?
Want to tell us more? (optional)
Thanks for the note!
Something went wrong — please try again.
Too many submissions. Try again in an hour.
Chloroplast Genome Editing Eliminates Gluten Immunogenicity in Triticum aestivum
It could mean that people with celiac disease — roughly 1 in 100 worldwide — may one day safely eat bread made from real wheat, without sacrificing the taste...
Rice is a cereal grain and in its domesticated form is the staple food of over half of the world's population, particularly in Asia and Africa. Rice is the seed of the grass species Oryza sativa —or, much less commonly, Oryza glaberrima. Asian rice was domesticated in China some 13,500 to 8,200 y...