Biphasic activation of survival and death pathways in Arabidopsis thaliana cultured cells by sorbitol-induced hyperosmotic stress.

Plant science : an international journal of experimental plant biology 2021 Apr

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Hyperosmotic stresses represent some of the most serious abiotic factors that adversely affect plants growth, development and fitness. Despite their central role, the early cellular events that lead to plant adaptive responses remain largely unknown. In this study, using Arabidopsis thaliana cultured cells we analyzed early cellular responses to sorbitol-induced hyperosmotic stress. We observed biphasic and dual responses of A. thaliana cultured cells to sorbitol-induced hyperosmotic stress. A first set of events, namely singlet oxygen (1O2) production and cell hyperpolarization due to a decrease in anion channel activity could participate to signaling and osmotic adjustment allowing cell adaptation and survival. A second set of events, namely superoxide anion (O2-) production by RBOHD-NADPH-oxidases and SLAC1 anion channel activation could participate in programmed cell death (PCD) of a part of the cell population. This set of events raises the question of how a survival pathway and a death pathway could be induced by the same hyperosmotic condition and what could be the meaning of the induction of two different behaviors in response to hyperosmotic stress. Copyright © 2021 Elsevier B.V. All rights reserved.

Citation

Tingting Zhao, Delphine Arbelet-Bonnin, Daniel Tran, Emanuela Monetti, Arnaud Lehner, Patrice Meimoun, Takashi Kadono, Aurélien Dauphin, Rafik Errakhi, David Reboutier, Sylvie Cangémi, Tomonori Kawano, Stefano Mancuso, Hayat El-Maarouf-Bouteau, Patrick Laurenti, François Bouteau. Biphasic activation of survival and death pathways in Arabidopsis thaliana cultured cells by sorbitol-induced hyperosmotic stress. Plant science : an international journal of experimental plant biology. 2021 Apr;305:110844