Singlet oxygen-mediated and EXECUTERdependent signalling and acclimation of Arabidopsis thaliana exposed to light stress

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Abstract

Plants respond to environmental changes by acclimation that activates defence mechanisms and enhances the plant's resistance against a subsequent more severe stress. Chloroplasts play an important role as a sensor of environmental stress factors that interfere with the photosynthetic electron transport and enhance the production of reactive oxygen species (ROS). One of these ROS, singlet oxygen (1O2), activates a signalling pathway within chloroplasts that depends on the two plastid-localized proteins EXECUTER 1 and 2. Moderate light stress induces acclimation protecting photosynthetic membranes against a subsequent more severe high light stress and at the same time activates 1O2-mediated and EXECUTER-dependent signalling. Pre-treatment of Arabidopsis seedlings with moderate light stress confers cross-protection against a virulentPseudomonas syringae strain. While non-pre-acclimated seedlings are highly susceptible to the pathogen regardless of whether 1O2- and EXECUTER-dependent signalling is active or not, pre-stressed acclimated seedlings without this signalling pathway lose part of their pathogen resistance. These results implicate 1O2- and EXECUTER-dependent signalling in inducing acclimation but suggest also a contribution by other yet unknown signalling pathways during this response of plants to light stress. © 2014 The Author(s) Published by the Royal Society. All rights reserved.

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Zhang, S., Apel, K., & Kim, C. (2014, April 19). Singlet oxygen-mediated and EXECUTERdependent signalling and acclimation of Arabidopsis thaliana exposed to light stress. Philosophical Transactions of the Royal Society B: Biological Sciences. https://doi.org/10.1098/rstb.2013.0227

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