Root growth in Arabidopsis requires gibberellin/DELLA signalling in the endodermis
Research output: Contribution to journal › Article › peer-review
Colleges, School and Institutes
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.
|Number of pages||4|
|Journal||Nature Cell Biology|
|Early online date||20 Apr 2008|
|Publication status||Published - 20 Apr 2008|