Arabidopsis Thaliana Is Able to Sense Tomato Systemin Promoting Defense

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Arabidopsis thaliana is able to sense tomato Systemin promoting defense against fungal pathogens PASTOR-FERNÁNDEZ J.1, Sánchez-Bel P.1, Pastor V.1, Gamir J.1, Sanmartín N.1 and Flors V1. [email protected] 1Metabolic Integration and Cell Signaling Laboratory, Plant Physiology Section, Department of Ciencias Agrarias y del Medio Natural, Universitat Jaume I, Castellón, Spain. Systemin is a small tomato peptide that regulates the plant response against herbivores and pathogenic fungi. It is released from a larger precursor upon wounding or pathogen attack and binds to a membrane receptor of the adjacent cell inducing a cascade of plant defences, including JA-related responses, that lead to the accumulation of protease inhibitors in local and systemic tissue. Although the tomato Systemin has been the focus of many recent studies, very little is known about the perception and function of Systemin in heterologous species. Systemin induces resistance against P.cucumerina Systemin perception in Arabidopsis is not through displaying a threshold of action Pep1 receptors PEPR1 and PEPR2 Threshold of action a b a b a b b ab a a ns pepr1 pepr2 Mutants of Pep1 receptors were protected by Systemin JA-Signaling plays an important role in Systemin induced resistance (Sys-IR) Hormones from the main defense signaling pathways (JA Mutants of the SA pathway were protected by and SA) were accumulated upon systemin treatment Systemin displaying a WT phenotype Mutants of the JA pathway were impaired in Sys-IR Only JA-related genes expression were higher in systemin treated plants after infection Conclusions • Tomato Systemin is perceived by Arabidopsis thaliana inducing resistance against Plectosphaerella cucumerina infection. • Sys-IR is modulated by JA-related responses in Arabidopsis as in tomato, sugestting that there are common signaling elements in response to Systemin in both species..

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