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Journal of Experimental Botany 2007 58(15-16):4269-4281; doi:10.1093/jxb/erm288
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© The Author [2007]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

Ethylene-induced Arabidopsis hypocotyl elongation is dependent on but not mediated by gibberellins

Filip Vandenbussche1, Bram Vancompernolle1, Ivo Rieu2, Margaret Ahmad3,4, Andy Phillips2, Thomas Moritz5, Peter Hedden2 and Dominique Van Der Straeten1,*

1Unit of Plant Hormone Signaling & Bio-imaging, Department of Molecular Genetics, Ghent University, Ledeganckstraat 35, B-9000 Ghent, Belgium
2Rothamsted Research, West Common, Harpenden, Herts AL5 2JQ, UK
3Université Paris VI, UMR-CNRS 7632, Casier 156, 4, Place Jussieu, 75252 Paris Cedex 05, France
4Penn State University, 25 Yearsley Mill Road, Media, PA 19063, USA
5Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden

* To whom correspondence should be sent. E-mail: Dominique.VanDerStraeten{at}ugent.be

Ethylene, or its precursor 1-aminocyclopropane-1-carboxylic acid (ACC), can stimulate hypocotyl elongation in the light. It is questioned whether gibberellins (GAs) play a role in this response. Tests with light of different wavelengths demonstrated that the ethylene response depends on blue light and functional cryptochrome signalling. Levels of bio-active GA4 were reduced in seedlings showing an ethylene response. Furthermore, ACC treatment of seedlings caused accumulation of the DELLA protein RGA, a repressor of growth. Concurrently, transcript levels of several GA biosynthesis genes were up-regulated and GA inactivation genes down-regulated by ACC. Hypocotyl elongation in response to ACC was strongly reduced in seedlings with a diminished GA signal, while being vigorously stimulated in a quadruple DELLA knock-out mutant with constitutive GA signalling. These data show that ethylene-driven hypocotyl elongation is mainly blue light-dependent and that this ethylene response, although GA dependent, hence needing a basal GA level, is not mediated by GA, but rather acts via a separate pathway.

Key words: Arabidopsis, ethylene, gibberellin, hypocotyl elongation, light signalling

Received 2 August 2007; Revised 20 October 2007 Accepted 22 October 2007


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