Low Blue Light Enhances Phototropism by Releasing Cryptochrome1-Mediated Inhibition of PIF4 Expression.

Détails

ID Serval
serval:BIB_FE090E44B17B
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Low Blue Light Enhances Phototropism by Releasing Cryptochrome1-Mediated Inhibition of PIF4 Expression.
Périodique
Plant physiology
Auteur(s)
Boccaccini A., Legris M., Krahmer J., Allenbach-Petrolati L., Goyal A., Galvan-Ampudia C., Vernoux T., Karayekov E., Casal J.J., Fankhauser C.
ISSN
1532-2548 (Electronic)
ISSN-L
0032-0889
Statut éditorial
Publié
Date de publication
08/2020
Peer-reviewed
Oui
Volume
183
Numéro
4
Pages
1780-1793
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
Shade-avoiding plants, including Arabidopsis (Arabidopsis thaliana), display a number of growth responses, such as elongation of stem-like structures and repositioning of leaves, elicited by shade cues, including a reduction in the blue and red portions of the solar spectrum and a low-red to far-red ratio. Shade also promotes phototropism of de-etiolated seedlings through repression of phytochrome B, presumably to enhance capture of unfiltered sunlight. Here we show that both low blue light and a low-red to far-red light ratio are required to rapidly enhance phototropism in Arabidopsis seedlings. However, prolonged low blue light treatments are sufficient to promote phototropism through reduced cryptochrome1 (cry1) activation. The enhanced phototropic response of cry1 mutants in the lab and in response to natural canopies depends on PHYTOCHROME INTERACTING FACTORs (PIFs). In favorable light conditions, cry1 limits the expression of PIF4, while in low blue light, PIF4 expression increases, which contributes to phototropic enhancement. The analysis of quantitative DII-Venus, an auxin signaling reporter, indicates that low blue light leads to enhanced auxin signaling in the hypocotyl and, upon phototropic stimulation, a steeper auxin signaling gradient across the hypocotyl. We conclude that phototropic enhancement by canopy shade results from the combined activities of phytochrome B and cry1 that converge on PIF regulation.
Pubmed
Web of science
Open Access
Oui
Création de la notice
06/07/2020 12:53
Dernière modification de la notice
25/02/2021 6:26
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