Poltergeist-Like 2 (PLL2)-dependent activation of herbivore defence distinguishes systemin from other immune signalling pathways.

ABSTRACT: Systemin, the first signalling peptide identified in plants, mediates induced resistance against insect herbivores and necrotrophic pathogens in tomato^1-3. Initially, systemin was conceived as a hormone-like, long-distance messenger that triggers systemic defence responses far from the site of insect attack. It was later found to rather act as a phytocytokine, amplifying the local wound response for the production of downstream signals that activate defence gene expression in distant tissues⁴. Systemin perception and signalling rely on the systemin receptor SYR1⁵. However, the specifics of SYR1-dependent signalling and how systemin signalling differs from other immune signalling pathways remain largely unknown. Here we report that systemin activates the pol

SUBMITTER: Li R 

PROVIDER: S-EPMC12283378 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature