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Research article - Peer-reviewed, 2008

Root growth in Arabidopsis requires gibberellin/DELLA signalling in the endodermis

Ubeda-Tomas, Susana; Swarup, Ranjan; Coates, Juliet; Swarup, Kamal; Laplaze, Laurent; Beemster, Gerrit T. S.; Hedden, Peter; Bhalerao, Rishikesh; Bennett, Malcolm J.


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.

Published in

Nature Cell Biology
2008, Volume: 10, number: 5, pages: 625-628