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JXB Advance Access published online on July 4, 2005
Journal of Experimental Botany, doi:10.1093/jxb/eri196
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© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oupjournals.org
Received November 4, 2004
Accepted April 12, 2005

RESEARCH PAPER

Complementary interactions between oxidative stress and auxins control plant growth responses at plant, organ, and cellular level

Taras Pasternak 1, Geert Potters 2*, Roland Caubergs 2, and Marcel A. K. Jansen 3

1 Institute of Cell Biology and Genetic Engineering, National Academy of Science of Ukraine, Zabolotnogo str. 148, U-03650 Kiev, Ukraine; Laboratory for Plant Physiology, Department of Biology, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium
2 Laboratory for Plant Physiology, Department of Biology, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium
3 Laboratory for Plant Physiology, Department of Biology, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium; Department of Plant Sciences (ZEPS), University College Cork, Butler Building, Distillery Field, North Mall, Cork, Ireland

* To whom correspondence should be addressed.
Geert Potters, E-mail: geert.potters{at}ua.ac.be


  Abstract

Plant stress responses are a key factor in steering the development of cells, tissues, and organs. However, the stress-induced signal transduction cascades that control localized growth and cell size/differentiation are not well understood. It is reported here that oxidative stress, exerted by paraquat or alloxan, induced localized cell proliferation in intact seedlings, in isolated root segments, and at the single cell level. Analysis of the stress-induced mitotic activity revealed that oxidative stress enhances auxin-dependent growth cycle reactivation. Based on the similarities between responses at plant, tissue, or single cell level, it is hypothesized that a common mechanism of reactive oxygen species enhanced auxin-responsiveness underlies the stress-induced re-orientation of growth, and that stress-induced effects on the protoplast growth cycle are directly relevant in terms of understanding whole plant behaviour.

Keywords: Alloxan; auxin; auxin metabolism; cell differentiation; oxidative stress; plant development.
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