Plant hormone spray helps mulberry trees detoxify manganese-poisoned soil
Li J, Ackah M, Amoako FK, Zhu M, Kumi F
Phytoremediation
If you garden near old mining sites, industrial land, or naturally metal-rich soil, this points to a real strategy (hormone treatment plus a specific gene) for growing trees that pull toxic manganese out of the ground instead of suffering stunted, yellowing leaves.
Too much manganese in soil is toxic to plants, damaging their ability to photosynthesize and turning leaves pale and stunted. Researchers discovered that treating mulberry trees with a hormone called jasmonic acid switches on a gene, MaCAX3, that shuttles the excess manganese into a safe storage bubble inside plant cells, and slow-release hormone capsules made from a special material helped deliver this protection over time. When they gave the same gene to a test plant (Arabidopsis), it also became better at handling manganese, suggesting this trick could be bred or engineered into other metal-sensitive plants.
Key Findings
Manganese toxicity significantly reduced mulberry growth, biomass, and photosynthetic efficiency (Fv/Fm) along with chlorophyll content.
MeJA released from a slow-release MeJA@ZIF-8 composite (up to 200 μM) boosted antioxidant enzymes (superoxide dismutase, peroxidase, catalase), lowered oxidative damage markers, and induced MaCAX3 expression.
Silencing MaCAX3 in mulberry weakened manganese tolerance, while overexpressing it in Arabidopsis improved tolerance by reducing reactive oxygen species.
chevron_right Technical Summary
Scientists found that a plant hormone called jasmonic acid helps mulberry trees survive toxic manganese levels in soil by switching on a gene that pumps the metal into safe storage compartments inside cells, offering a new tool for cleaning up contaminated soils.
Abstract Preview
Original paper
Jasmonic Acid-Induced Vacuolar Cation/Proton Exchanger 3 (CAX3) Expression Drives Tolerance to Manganese Toxicity in Mulberry (Morus alba L.).
The transport of manganese (Mn) from the cytosol into the vacuole is a crucial mechanism for metal and ion tolerance in plants. Mulberry exhibits potential to detoxify Mn via phytoremediation by ac...
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