Title
Root growth in **Arabidopsis** requires gibberellin/DELLA signalling in the endodermis Root growth in **Arabidopsis** requires gibberellin/DELLA signalling in the endodermis
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
London ,
Subject
Biology
Source (journal)
Nature cell biology. - London
Volume/pages
10(2008) :5 , p. 625-628
ISSN
1465-7392
ISI
000255502400020
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
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.
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