Pathogen-derived mechanical cues potentiate the spatio-temporal implementation of plant defense

L'équipe QIP du LIPME a publié un article en décembre 2022 dans BMC Biology, qui montre l'existence d'une nouvelle couche de résistance (MTI mechano-signalling Immunity) qui contribue à 40% du phénotype de résistance à la sclérotinia.

"The ongoing adaptation of plants to their environment is the basis for their survival. In this adaptation, mechanoperception of gravity and local curvature plays a role of prime importance in finely regulating growth and ensuring a dynamic balance preventing buckling. However, the abiotic environment is not the exclusive cause of mechanical stimuli. Biotic interactions between plants and microorganisms also involve physical forces and potentially mechanoperception. Whether pathogens trigger mechanoperception in plants and the impact of mechanotransduction on the regulation of plant defense remains however elusive.

Here, we found that the perception of pathogen-derived mechanical cues by microtubules potentiates the spatio-temporal implementation of plant immunity to fungus. By combining biomechanics modeling and image analysis of the post-invasion stage, we reveal that fungal colonization releases plant cell wall-born tension locally, causing fluctuations of tensile stress in walls of healthy cells distant from the infection site. In healthy cells, the pathogen-derived mechanical cues guide the reorganization of mechanosensing cortical microtubules (CMT). The anisotropic patterning of CMTs is required for the regulation of immunity-related genes in distal cells. The CMT-mediated mechanotransduction of pathogen-derived cues increases Arabidopsis disease resistance by 40% when challenged with the fungus Sclerotinia sclerotiorum.

CMT anisotropic patterning triggered by pathogen-derived mechanical cues activates the implementation of early plant defense in cells distant from the infection site. We propose that the mechano-signaling triggered immunity (MTI) complements the molecular signals involved in pattern and effector-triggered immunity."


Voir aussi

Ophélie Léger, Frédérick Garcia, Mehdi Khafif, Sebastien Carrere, Nathalie Leblanc-Fournier, Aroune Duclos, Vincent Tournat, Eric Badel, Marie Didelon, Aurélie Le Ru, Sylvain Raffaele & Adelin Barbacci
BMC Biology 20, 292 (2022).
Pathogen-derived mechanical cues potentiate the spatio-temporal implementation of plant defense.

Date de modification : 25 janvier 2024 | Date de création : 25 janvier 2024 | Rédaction : Tulip Communication, Adelin Barbacci