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

Research output: Contribution to journalArticlepeer-review


  • S Ubeda-Tomas
  • R Swarup
  • K Swarup
  • L Laplaze
  • GT Beemster
  • P Hedden
  • R Bhalerao
  • MJ Bennett

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.


Original languageEnglish
Pages (from-to)625-628
Number of pages4
JournalNature Cell Biology
Issue number5
Early online date20 Apr 2008
Publication statusPublished - 20 Apr 2008