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Research article - Peer-reviewed, 2012

AtWRKY15 perturbation abolishes the mitochondrial stress response that steers osmotic stress tolerance in Arabidopsis

Vanderauwera, Sandy; Vandenbroucke, Korneel; Inzé, Annelies; van de Cotte, Brigitte; Mühlenbock, Per; de Rycke, R; Naouar, Naïra; van Gaever, Tim; van Montagu, Marc C. E.; van Breusegem, F


Environmental stresses adversely affect plant growth and development. A common theme within these adverse conditions is the perturbation of reactive oxygen species (ROS) homeostasis. Here, we demonstrate that the ROS-inducible Arabidopsis thaliana WRKY15 transcription factor (AtWRKY15) modulates plant growth and salt/osmotic stress responses. By transcriptome profiling, a divergent stress response was identified in transgenic WRKY15-overexpressing plants that linked a stimulated endoplasmic reticulum-to-nucleus communication to a disrupted mitochondrial stress response under salt-stress conditions. We show that mitochondrial calcium-flux sensing might be important for regulating an active mitochondrial retrograde signaling and launching an appropriate defense response to confer salt-stress tolerance.


abiotic stress signaling; cell expansion; microarray; hydrogen peroxide

Published in

Proceedings of the National Academy of Sciences
2012, Volume: 109, number: 49, pages: 20113-20118

    SLU Authors

    • Mühlenbock, Per

      • Ghent University

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