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Nat Cell Biol. 2008 May;10(5):625-8. doi: 10.1038/ncb1726. Epub 2008 Apr 20.

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

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Centre for Plant Integrative Biology, University of Nottingham, Loughborough, LE12 5RD, UK.


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.

[Indexed for MEDLINE]

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