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JXB Advance Access originally published online on November 28, 2008
Journal of Experimental Botany 2009 60(4):1085-1092; doi:10.1093/jxb/ern301
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© The Author [2009]. 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

REVIEW-ARTICLE

Releasing the brakes of plant growth: how GAs shutdown DELLA proteins

P. Achard and P. Genschik*

Institut de Biologie Moléculaire des Plantes, Centre National de la Recherche Scientifique, Unité Propre de Recherche 2357, Conventionné avec l'Université Louis Pasteur, F-67084 Strasbourg, France

* To whom correspondence should be addressed: E-mail: pascal.genschik{at}ibmp-ulp.u-strasbg.fr

Bioactive gibberellins (GAs) are tetracyclic diterpenoid plant hormones that promote important processes of plant growth and development, such as seed germination, growth through elongation, and floral transition. Thus, mutant plants that are affected in GA biosynthesis or signalling exhibit altered seed germination and, at the adult stage, are dwarf and dark green and also show delayed flowering. The components of the GA metabolism and signalling pathways are reviewed here and recent findings regarding the regulation and possible mode of action of DELLA proteins are discussed.

Key words: Arabidopsis, DELLA, ROS, gibberellins, ubiquitin

Received 29 September 2008; Revised 24 October 2008 Accepted 3 November 2008


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