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Title
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Root growth in **Arabidopsis** requires gibberellin/DELLA signalling in the endodermis
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Author
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Abstract
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| 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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Language
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English
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Source (journal)
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Nature cell biology. - London
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Publication
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London
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2008
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ISSN
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1465-7392
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Volume/pages
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10
:5
(2008)
, p. 625-628
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ISI
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000255502400020
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Full text (Publisher's DOI)
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