Foliar Spraying of Silica Nanoparticles Outperforms Its Soil Amendment in Reducing Grain Arsenic via Facilitated Rhizosphere Microbial As(V) Reduction and Enhanced Arsenic Retention by Stem/Nodes.
Gao Y, Pan D, Liao X, Deng J, Zhao J
Phytoremediation
Rice grown in arsenic-contaminated paddies quietly concentrates that arsenic into the grain you eat — and this research points to a simple spray-on treatment that could cut that load significantly.
Arsenic naturally seeps into rice grains when plants are grown in contaminated soil, and scientists have been searching for safe ways to block that pathway. Researchers found that misting rice leaves with tiny silica particles worked better than mixing those particles into the soil. The leaf spray changed the community of microbes living around the roots and caused the plant's stems to hold onto arsenic instead of letting it travel up into the grain.
Key Findings
Foliar (leaf-spray) application of silica nanoparticles reduced grain arsenic more effectively than soil amendment with the same material.
The foliar treatment altered rhizosphere microbial activity, promoting microbial reduction of arsenate (As(V)) — a form of arsenic — near the roots.
Enhanced arsenic retention in stems and nodes was a key mechanism preventing arsenic translocation into the grain.
chevron_right Technical Summary
Spraying rice plants with silica nanoparticles on their leaves reduces arsenic in the grain more effectively than adding the same material to the soil. The leaf-spray method works by changing soil microbes near the roots and trapping arsenic in the plant's stems before it can reach the grain.
Abstract Preview
Silica nanoparticles (SiNPs) exhibit inconsistent effects on mitigating arsenic accumulation in rice grains. Here, we investigated how SiNPs reduce grain arsenic using pot experiments with foliar (...
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