Magnesium mineral additive blocks plastic uptake in tomato plants
Liu Z, Pan J, Li W, Jia T, Sun X
Soil Health
If you grow vegetables in urban soil that may harbor microplastic fragments from degraded packaging and synthetic mulch, this points to a simple soil amendment that could keep that plastic out of your harvest.
Scientists added five common types of plastic fragments to soil growing tomatoes, then tried fixing it with a tiny dose of magnesium oxide, a mineral additive. The magnesium oxide triggered the tomato roots to build a tougher, more lignin-rich barrier, which blocked plastic particles from entering the plant, cutting some types by over 75%. It also seemed to calm stress inside plant cells caused by the plastic exposure.
Key Findings
Soil amendment with 40 mg/kg MgO nanoparticles reduced accumulation of PET, PS, and PVC microplastics in tomato tissue by 57.44%, 76.14%, and 31.82% respectively.
MgO nanoparticles upregulated phenylpropanoid pathway genes (PAL, 4CL, CCR), increasing root lignin content by 26.7% and strengthening the apoplastic barrier against plastic uptake.
MgO treatment altered ERAD-related gene expression, suggesting it helps relieve endoplasmic reticulum stress and protein misfolding triggered by microplastic exposure.
chevron_right Technical Summary
A natural mineral additive, nanoscale magnesium oxide, helped tomato plants resist contamination from common plastic pollutants found in soil, cutting the amount absorbed by up to 76% and easing cellular stress from the exposure.
Abstract Preview
Original paper
Nanoscale magnesium oxide reduces the accumulation and toxicity of micro/nanoplastics by accelerating root lignification and alleviating endoplasmic reticulum stress.
The risk to agricultural production and human health from micro/nanoplastics (MNPs) exposure cannot be ignored, making it imperative to find effective mitigation strategies. Nanoscale magnesium oxi...
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The tomato is a plant whose fruit is an edible berry that is eaten as a vegetable. The tomato is a member of the nightshade family that includes tobacco, potato, and chili peppers. It originated from western South America, and may have been domesticated there, in Mexico, or in Central America. Th...