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Fig. 6 | BMC Plant Biology

Fig. 6

From: Prior exposure of Arabidopsis seedlings to mechanical stress heightens jasmonic acid-mediated defense against necrotrophic pathogens

Fig. 6

A model showing how prior exposure of juvenile seedlings to a short period of MS can prime gene expression and resistance to subsequent necrotrophic pathogen infection. The first stress encounter induced by repetitive MS (pre-infection) causes: 1) an increase in JA accumulation, 2) the accumulation of defense compounds (e.g. lignin and callose) that promote structural barriers, and 3) altered levels of basal gene expression. The secondary stress encountered by inoculating MS-treated plants with A. brassicicola causes the hyper-induction or contra-regulation of gene expression five-days post-infection that primes resistance to necrotrophic pathogen infection. A genetic perturbation in JA signalling mediated by the coronatine-insensitive 1 (coi1–16) mutant affected the priming of gene expression and rendered MS-treated plants susceptible to infection

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