Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 109, Issue 49, Pages 20113-20118Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1217516109
Keywords
abiotic stress signaling; cell expansion; microarray; hydrogen peroxide
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Funding
- Ghent University [12051403, 01MRB510W]
- Agency for Innovation by Science and Technology [040134/Bayer]
- Research Foundation-Flanders [G.0350.04N]
- Scientific Exchange Program Flanders-France [Tournesol T.2008.21]
- Marie Curie Intra-European Fellowship for Career Development [PIEF-GA-2009-235827]
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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.
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