SlABH15 Promotes Jasmonate-Mediated Lead Detoxification in Tomato: A Promising Target for Enhancing Phytoremediation and Lead Stress Tolerance.
Li F, Ghanizadeh H, Wang H, Liu F, Zhang H
Phytoremediation
Lead contamination lingers in soil for decades after old paint chips, leaded gasoline, or industrial runoff — and a gene that lets tomatoes actively tolerate and sequester that lead could help gardeners and restoration crews reclaim contaminated urban plots without heavy machinery.
When tomato plants sense lead in the soil, a specific gene switches on hard and fast — cranking up roughly 30 times within a single day. That gene acts like a molecular converter, turning one plant hormone into another, which then triggers a whole defense program that keeps the plant's cells healthy and its leaves photosynthesizing normally. Plants with extra copies of this gene actually ended up with less lead in their tissues, hinting that the plant gets better at managing where that toxic metal goes.
Key Findings
SlABH15 gene activity increased approximately 30-fold within 24 hours of lead exposure, one of the strongest stress-induction responses reported for this gene family in tomato.
Tomato plants engineered to overexpress SlABH15 accumulated less lead in their tissues, produced less damaging reactive oxygen, and maintained normal photosynthesis compared to unmodified plants.
SlABH15 physically binds KAT2, a key enzyme in the jasmonic acid hormone pathway, and this protein-protein interaction is itself strengthened by both lead exposure and jasmonic acid — forming a self-reinforcing defense loop.
chevron_right Technical Summary
Scientists identified a tomato gene, SlABH15, that ramps up dramatically when the plant detects lead in soil and triggers a hormonal chain reaction that helps the plant survive, keep photosynthesizing, and pull lead out of its own tissues — a discovery that could advance efforts to use plants as living soil-cleanup tools.
Abstract Preview
Lead (Pb2+) toxicity disrupts cellular redox homeostasis and photosynthesis, highlighting the need to uncover the mechanisms underlying Pb2+ tolerance in phytoremediation. In this study, we charact...
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