Machine learning-assisted meta-analysis reveals melatonin crosstalk regulating plant growth plasticity under heavy metal stress.
Moeen-Ud-Din M, Hassan MA, Ahmad A, Xianhua L, Ishfaq M
Phytoremediation
If you grow vegetables in urban soil or near old industrial sites, melatonin treatments could one day be a simple, low-dose tool to help your crops grow stronger while absorbing less lead, cadmium, or arsenic from contaminated ground.
Scientists pooled results from 140 different experiments and found that giving plants melatonin—a natural hormone found in many living things—helps them cope when the soil is contaminated with toxic metals like lead or cadmium. The melatonin-treated plants grew bigger, produced more chlorophyll (the green stuff that powers photosynthesis), and actually took up less of the harmful metals compared to untreated plants. The sweet spot was small doses for short periods: low concentrations applied for two weeks or less gave the best results.
Key Findings
Exogenous melatonin improved overall plant performance by 18%, including shoot biomass (+45.5%) and root biomass (+39.5%), across 2,476 observations from 140 studies.
Melatonin reduced heavy metal uptake by plants by 19.4% and lowered oxidative damage by 23.5%, while boosting antioxidant activity by 31.8%.
Machine learning identified optimal treatment conditions: melatonin doses of 100 μM or less applied for 15 days or fewer produced the strongest benefits; higher doses or longer exposures diminished the effect.
chevron_right Technical Summary
A large analysis of 140 studies found that melatonin—yes, the same molecule involved in human sleep—helps crop plants survive heavy metal pollution in soil, boosting their growth by 18% and cutting how much toxic metal they absorb by 19%.
Abstract Preview
Heavy metal (HM) pollution is a traditional and ongoing global ecological issue that requires continuous attention. Although studies have focused on how plants cope with HMs stress, the related res...
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