Growth hormone quietly dials down a plant's disease defenses
Ramirez VE, Shuai H, Hwu FY, Hazarika RR, Tao CN
Plant Signaling
Every gardener has noticed that a plant pushed hard with fertilizer or ideal conditions sometimes gets hit harder by disease, and this research shows one of the hidden hormonal switches that makes that trade-off happen at the DNA level.
Plants constantly balance two costly jobs: growing bigger and fighting off germs. Researchers found that a steroid-like growth hormone in a small mustard plant called thale cress can flip a chemical switch on certain defense genes, essentially telling the plant 'grow now, worry about germs later.' This switch works by adding tiny chemical tags to the DNA near immune genes, which changes how those genes get read and used.
Key Findings
Brassinosteroid-regulated transcription factor CESTA (plus homologs BEE1-3) triggers DNA methylation changes at transposable-element-rich regions containing immune receptor genes like SNC1 in Arabidopsis thaliana
These methylation changes alter the splicing of SNC1 pre-mRNA, and this process depends on the brassinosteroid receptor BRI1
CESTA physically associates with chromatin remodeling and RNA splicing machinery, linking hormone signaling directly to epigenetic control of immune gene expression
chevron_right Technical Summary
Scientists discovered that a plant growth hormone can switch off immune genes by chemically tagging the plant's DNA, helping the plant put energy into growing instead of defending itself. This trade-off mechanism, found in a model plant, could help explain why fast-growing plants are sometimes more vulnerable to disease.
Abstract Preview
Original paper
Brassinosteroid-regulated transcription factors confer epigenetic changes that repress plant immunity.
When organisms encounter pathogens, they rapidly activate complex defense programs to ensure survival. While these immune responses are vital, they often also incur trade-offs, such as reduced grow...
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Arabidopsis thaliana, the thale cress, mouse-ear cress or arabidopsis, is a small plant from the mustard family (Brassicaceae), native to Eurasia and Africa. Commonly found along the shoulders of roads and in disturbed land, it is generally considered a weed.