Contrasting growth responses in lamina and petiole during neighbor detection depend on differential auxin responsiveness rather than different auxin levels.

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Ressource 1Télécharger: BIB_8B888CBCE302.P001.pdf (1357.29 [Ko])
Etat: Public
Version: Author's accepted manuscript
ID Serval
serval:BIB_8B888CBCE302
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Contrasting growth responses in lamina and petiole during neighbor detection depend on differential auxin responsiveness rather than different auxin levels.
Périodique
New Phytologist
Auteur(s)
de Wit M., Ljung K., Fankhauser C.
ISSN
1469-8137 (Electronic)
ISSN-L
0028-646X
Statut éditorial
Publié
Date de publication
2015
Volume
208
Numéro
1
Pages
198-209
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't Publication Status: ppublish
Résumé
Foliar shade triggers rapid growth of specific structures that facilitate access of the plant to direct sunlight. In leaves of many plant species, this growth response is complex because, although shade triggers the elongation of petioles, it reduces the growth of the lamina. How the same external cue leads to these contrasting growth responses in different parts of the leaf is not understood. Using mutant analysis, pharmacological treatment and gene expression analyses, we investigated the role of PHYTOCHROME INTERACTING FACTOR7 (PIF7) and the growth-promoting hormone auxin in these contrasting leaf growth responses. Both petiole elongation and lamina growth reduction are dependent on PIF7. The induction of auxin production is both necessary and sufficient to induce opposite growth responses in petioles vs lamina. However, these contrasting growth responses are not caused by different auxin concentrations in the two leaf parts. Our work suggests that a transient increase in auxin levels triggers tissue-specific growth responses in different leaf parts. We provide evidence suggesting that this may be caused by the different sensitivity to auxin in the petiole vs the blade and by tissue-specific gene expression.
Mots-clé
Arabidopsis/growth & development, Arabidopsis/metabolism, Arabidopsis Proteins/metabolism, DNA-Binding Proteins/metabolism, Darkness, Gene Expression, Indoleacetic Acids/metabolism, Light, Plant Leaves/growth & development, Plant Leaves/metabolism
Pubmed
Web of science
Création de la notice
19/06/2015 15:12
Dernière modification de la notice
20/08/2019 14:50
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