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Abstract

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.

Keywords

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
Publisher: NATL ACAD SCIENCES

SLU Authors

  • Mühlenbock, Per

    • Ghent University

UKÄ Subject classification

Botany

Publication identifier

  • DOI: https://doi.org/10.1073/pnas.1217516109

Permanent link to this page (URI)

https://res.slu.se/id/publ/41168