The SlCBL-SlCML24 module mediates silicon-enhanced resistance to bacterial wilt in Solanum lycopersicum.
Yu C, Jin Y, Wang H
Plant Signaling
Sprinkling a silicon-rich soil amendment like diatomaceous earth around your tomato plants isn't just folk wisdom — scientists now have a molecular explanation for why it works against bacterial wilt, one of the most destructive tomato diseases with no easy chemical cure.
Silicon, a mineral naturally found in soil, can help tomato plants fight off a deadly bacterial disease — and scientists finally figured out the molecular reason why. When silicon is present, it triggers a cascade inside the plant: calcium signals activate two proteins that team up to switch on the plant's immune genes and ramp up protective antioxidant enzymes. Without those two proteins, even silicon-treated plants become vulnerable and wilt faster.
Key Findings
Silicon treatment caused a 96.88-fold increase in the SlCBL defense gene in tomato plants actively infected with bacterial wilt pathogen Ralstonia solanacearum.
Tomato plants with SlCBL knocked out via CRISPR/Cas9 showed greater wilting severity, higher disease indices, and reduced activity of protective enzymes (CAT, POD, SOD) even when given silicon.
The SlCBL protein physically binds to a partner protein SlCML24, forming a calcium signaling module that is the central relay for silicon's disease-resistance effect.
chevron_right Technical Summary
Researchers discovered that silicon activates a two-protein calcium signaling switch inside tomato plants that dramatically boosts their resistance to bacterial wilt, a soil-borne disease that can devastate entire crops. The key players are two interacting proteins (SlCBL and SlCML24) whose activity surged nearly 97-fold when silicon-treated tomatoes were exposed to the pathogen.
Abstract Preview
Silicon can enhance plants' disease resistance, although the underlying molecular mechanisms, particularly the role of the calcineurin B-like protein gene SlCBL, remain unclear. To investigate the ...
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