Primed responses to damage signals mediate mycorrhiza-induced resistance in tomato plants.
Minchev Z, Garcia JM, Berrio E, Pozo MJ, Gamir J
Mycorrhizal Networks
If you've ever lost tomatoes or strawberries to gray mold, the solution may already be living in healthy soil: mycorrhizal fungi that quietly rewire the plant's alarm system so it fights off disease before you ever reach for a spray bottle.
When helpful soil fungi move into tomato roots, they don't just help the plant absorb water and nutrients — they also put its immune system on high alert. The fungi-colonized plants become extra sensitive to their own 'I'm being damaged' alarm signals, responding faster and more powerfully to threats. Researchers traced this heightened readiness to a single gene that acts like a volume knob on the plant's damage detector.
Key Findings
Mycorrhizal tomato plants responded defensively to lower doses of damage signals (oligogalacturonides) than non-mycorrhizal plants, showing the fungi prime the plant's sensitivity.
Colonized plants showed stronger accumulation of defense proteins, immune receptor kinases, and protective flavonoid compounds after receiving damage signals.
Knocking out the WAK1 gene — which was elevated in mycorrhizal plants — completely abolished the fungi-induced resistance against Botrytis cinerea gray mold.
chevron_right Technical Summary
Tomato plants colonized by beneficial soil fungi become more alert to their own damage signals, allowing them to mount a faster, stronger defense against fungal pathogens like gray mold. A single plant gene — WAK1 — appears to be the key switch that makes this heightened vigilance possible.
Abstract Preview
Arbuscular mycorrhizal fungi establish mutualistic associations with the roots of most vascular plants, enhancing plant immunity and activating mycorrhiza-induced resistance (MIR). MIR is a crucial...
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