Two natural plant hormones team up to beat copper poisoning
Mir AR, Arif Y, Bi MH, Zhang YH, Yang D
Phytoremediation
If your garden soil runs high in copper from old fungicide sprays or treated wood, this points to natural, affordable ways plants might bounce back instead of stalling out.
When plants soak up too much copper from soil, it's like rust forming inside their cells: it wrecks their internal machinery and chokes off photosynthesis. Researchers tested mustard plants under copper stress and found that treating them with melatonin and a natural growth hormone called auxin repaired the cellular damage and got photosynthesis humming again. The two worked even better together than separately, hinting at a simple combo treatment for crops growing in metal-contaminated soil.
Key Findings
Copper stress raised reactive oxygen species, hydrogen peroxide, and malondialdehyde levels while damaging chloroplast structure and cutting photosynthetic efficiency and CO2 assimilation.
Individual application of melatonin or IAA (auxin) reduced oxidative stress markers, restored redox balance, and repaired anatomical damage from copper toxicity.
Combined melatonin + IAA treatment produced the strongest recovery of photosynthesis, growth, and cellular structure compared to either compound alone.
chevron_right Technical Summary
Too much copper in soil stresses plants, damaging their cells and slowing growth, but scientists found that combining two natural plant hormones, melatonin and auxin, repairs the damage and restores healthy growth far better than either one alone.
Abstract Preview
Original paper
Melatonin and auxin act synergistically to restore photosynthetic efficiency and redox homeostasis in copper-stressed Brassica juncea.
Copper (Cu) is an essential micronutrient involved in mitochondrial respiration, photosynthesis, and oxidative stress regulation, however, at supra-optimal concentrations it displays toxicity and i...
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Brassica juncea, commonly mustard greens, brown mustard, Chinese mustard, Indian mustard, Japanese mustard, Korean green mustard, leaf mustard, Oriental mustard and vegetable mustard, is a species of mustard plant.