Leaf-sprayed nanoparticles help lettuce resist toxic mining pollution
Xi Q, Qiu H, Jiang X, Wang L, Yao Y
Phytoremediation
If you garden near old mining sites or in soil with unknown history, this points to a leaf-spray approach that could keep contaminants out of the vegetables you actually eat.
Scientists sprayed lettuce leaves with tiny particles of silica or manganese oxide and found the plants grew up to three times bigger and absorbed way less rare earth element pollution from contaminated soil, up to 91% less in the leafy parts we eat. The trick seems to work by triggering the plant's own stress hormones, which travel between roots and shoots, and by reshaping the community of helpful microbes living on the leaves and around the roots. It's essentially giving the plant a hormonal and microbial support system to fight off pollution on its own.
Key Findings
SiO2-NPs and MnO2-NPs applied to lettuce leaves at 0.5-1.25 mg/day/plant boosted growth up to 3.02-fold while cutting rare earth element accumulation by up to 74.0% in roots and 91.2% in shoots.
Nanoparticle treatment activated hormone signaling networks (notably auxin and jasmonates) coordinated between shoots and roots, with SiO2-NPs boosting stress-resistance compounds and MnO2-NPs regulating hormone signal transduction.
Treatments reshaped both phyllosphere (leaf) and rhizosphere (root-zone) microbial communities, including Pseudomonadota, Cyanobacteriota and Bacillota, with rhizosphere microbes strongly correlated to plant hormone levels.
chevron_right Technical Summary
Spraying tiny particles of silica or manganese oxide on lettuce leaves helped the plants grow bigger and pull far less contamination from polluted soil, offering a possible way to grow safer food near mining-affected farmland.
Abstract Preview
Original paper
Shoot-root hormonal coordination and cross-sphere microbiome assembly underpin nanomaterial-induced resistance to rare earth elements in lettuce.
Mining-induced rare earth elements (REEs) pollution in agricultural soil threatens food security, necessitating effective remediation strategies. Foliar-applied nanoparticles (NPs) offer a promisin...
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