Brief Communication abstract
Nature Cell Biology 10, 625 - 628 (2008)
Published online: 20 April 2008 | doi:10.1038/ncb1726
Root growth in Arabidopsis requires gibberellin/DELLA signalling in the endodermis
Susana Ubeda-Tomás1, Ranjan Swarup1, Juliet Coates2, Kamal Swarup1, Laurent Laplaze3, Gerrit T.S. Beemster4,5, Peter Hedden6, Rishikesh Bhalerao7 & Malcolm J. Bennett1
Gibberellins (GAs) are key regulators of plant growth and development. They promote growth by targeting the degradation of DELLA repressor proteins; however, their site of action at the cellular, tissue or organ levels remains unknown. To map the site of GA action in regulating root growth, we expressed gai, a non-degradable, mutant DELLA protein, in selected root tissues. Root growth was retarded specifically when gai was expressed in endodermal cells. Our results demonstrate that the endodermis represents the primary GA-responsive tissue regulating organ growth and that endodermal cell expansion is rate-limiting for elongation of other tissues and therefore of the root as a whole.
- Centre for Plant Integrative Biology, University of Nottingham, Loughborough, LE12 5RD, UK.
- School of Biosciences, University of Birmingham, Edgbaston B15 2TT UK.
- Institut de Recherche pour le Dévelopement, UMR 1097, 911 Avenue Agropolis, F-34394, Montpellier, cedex 5 France.
- Department of Plant Systems Biology, Flanders Institute for Biotechnology, 9052 Gent, Belgium.
- Department of Molecular Genetics, Ghent University, 9052 Gent, Belgium.
- Rothamsted Research, Harpenden, Herts AL5 2JQ, UK.
- Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, SLU, SE-901 83 Umeå, Sweden.
Correspondence to: Malcolm J. Bennett1 e-mail: malcolm.bennett@nottingham.ac.uk
Correspondence to: Rishikesh Bhalerao7 e-mail: Rishi.Bhalerao@genfys.slu.se
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