Differentially phased leaf growth and movements in Arabidopsis depend on coordinated circadian and light regulation.

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Etat: Public
Version: Author's accepted manuscript
ID Serval
serval:BIB_DB9334657D5F
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Differentially phased leaf growth and movements in Arabidopsis depend on coordinated circadian and light regulation.
Périodique
Plant Cell
Auteur(s)
Dornbusch T., Michaud O., Xenarios I., Fankhauser C.
ISSN
1532-298X (Electronic)
ISSN-L
1040-4651
Statut éditorial
Publié
Date de publication
2014
Peer-reviewed
Oui
Volume
26
Numéro
10
Pages
3911-3921
Langue
anglais
Résumé
In contrast to vastly studied hypocotyl growth, little is known about diel regulation of leaf growth and its coordination with movements such as changes in leaf elevation angle (hyponasty). We developed a 3D live-leaf growth analysis system enabling simultaneous monitoring of growth and movements. Leaf growth is maximal several hours after dawn, requires light, and is regulated by daylength, suggesting coupling between growth and metabolism. We identify both blade and petiole positioning as important components of leaf movements in Arabidopsis thaliana and reveal a temporal delay between growth and movements. In hypocotyls, the combination of circadian expression of PHYTOCHROME INTERACTING FACTOR4 (PIF4) and PIF5 and their light-regulated protein stability drives rhythmic hypocotyl elongation with peak growth at dawn. We find that PIF4 and PIF5 are not essential to sustain rhythmic leaf growth but influence their amplitude. Furthermore, EARLY FLOWERING3, a member of the evening complex (EC), is required to maintain the correct phase between growth and movement. Our study shows that the mechanisms underlying rhythmic hypocotyl and leaf growth differ. Moreover, we reveal the temporal relationship between leaf elongation and movements and demonstrate the importance of the EC for the coordination of these phenotypic traits.
Pubmed
Web of science
Open Access
Oui
Création de la notice
02/01/2015 9:37
Dernière modification de la notice
20/08/2019 16:00
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