Exl1 from Pectobacterium activates a jasmonate-dependent immune network in Arabidopsis thaliana.
Flores-Cuevas EJ, Torres M, Formey D, Martinez-Anaya C, Serrano M
Plant Signaling
Soft rot bacteria silently devastate vegetable gardens every summer, turning healthy stems to mush overnight — understanding how plants can be primed to resist them opens a path toward crops and garden varieties that defend themselves before the rot takes hold.
When a common plant-rotting bacterium infects plants, it releases a protein that — surprisingly — wakes up the plant's immune system. Scientists discovered that this protein triggers a whole network of plant defense hormones, kind of like hitting multiple alarm buttons at once. Plants exposed to this protein were noticeably better at resisting both bacterial rot and fungal infections afterward.
Key Findings
Exl1 protein activates at least four distinct plant hormone defense pathways (jasmonic acid, ethylene, salicylic acid, and abscisic acid) in a time-sequenced cascade
Plants pre-treated with Exl1 showed reduced disease symptoms when subsequently infected by both the bacterium Pectobacterium brasiliense and the fungus Botrytis cinerea
Genome-wide transcriptional analysis revealed broad reprogramming across diverse functional gene categories, with jasmonic acid-dependent responses dominating early stages and abscisic acid signaling emerging at six hours post-treatment
chevron_right Technical Summary
A bacterial protein called Exl1, produced by plant-rotting bacteria, triggers a cascade of defense responses in plants — essentially acting as an alarm that primes the plant to fight off further infection. Researchers mapped the full genetic response this alarm activates, finding it involves multiple hormone pathways and significantly reduces disease damage.
Abstract Preview
Bacterial expansins contribute to the virulence of diverse plant pathogens, yet their biological activity and molecular roles during host interactions remain to be elucidated. Expansin-like protein...
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