Abstract
The jasmonic acid pathway has been considered as the backbone of the response against necrotrophic pathogens. However, a hemi-biotrophic pathogen, such as Pseudomonas syringae, has taken advantage of the crosstalk between the different plant hormones in order to manipulate the responses for its own interest. Despite that, the way in which Pseudomonas syringae releases coronatine to activate jasmonic acid-derived responses and block the activation of salicylic acid-mediated responses is widely known. However, the implication of the jasmonic intermediates in the plant-Pseudomonas interaction is not studied yet. In this work, we analyzed the response of both, plant and bacteria using SiOPR3 tomato plants. Interestingly, SiOPR3 plants are more resistant to infection with Pseudomonas. The gene expression of bacteria showed that, in SiOPR3 plants, the activation of pathogenicity is repressed in comparison to wild type plants, suggesting that the jasmonic acid pathway might play a role in the pathogenicity of the bacteria. Moreover, treatments with JA restore the susceptibility as well as activate the expression of bacterial pathogenicity genes. The observed results suggest that a complete jasmonic acid pathway is necessary for the susceptibility of tomato plants to Pseudomonas syringae.
Highlights
A network of plant hormones that trigger specific defenses, orchestrate plant innate resistance against pests and pathogens
SiOPR3 Plants Are More Resistant to Pseudomonas syringae
OPR3 (SiOPR3 tomato plants) were Silenced inoculated with Pst to determine the role The of oxo-phytodienoic acid (OPDA)
Summary
A network of plant hormones that trigger specific defenses, orchestrate plant innate resistance against pests and pathogens. Oxylipins are considered to be crucial compounds for plants, since they play important developmental roles and are involved in plant defense mechanisms This family of molecules includes a vast array of bioactive metabolites that are generated from membrane lipids as a result of lipid peroxidation [1,2]. Jasmonates are a family of signaling molecules that act as phytohormones and regulate different processes that are related to plant development, such as tuber and trichome formation, leaf senescence, or reproductive development. These phytohormones regulate symbiotic interactions and plant responses to wounding, and defenses against insects and pathogens [3,4]. The conjugation of JA to Ile takes place in the cytoplasm and it is catalyzed by the amino acid conjugate synthetase JASMONATE RESISTANT1 (JAR1) [5]
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