UV-B Perceived by the UVR8 Photoreceptor Inhibits Plant Thermomorphogenesis.

Détails

Ressource 1Télécharger: 27989670Hayes et al 2016 Authors version.pdf (2078.01 [Ko])
Etat: Public
Version: Author's accepted manuscript
ID Serval
serval:BIB_28E55A0D6349
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
UV-B Perceived by the UVR8 Photoreceptor Inhibits Plant Thermomorphogenesis.
Périodique
Current biology
Auteur(s)
Hayes S., Sharma A., Fraser D.P., Trevisan M., Cragg-Barber C.K., Tavridou E., Fankhauser C., Jenkins G.I., Franklin K.A.
ISSN
1879-0445 (Electronic)
ISSN-L
0960-9822
Statut éditorial
Publié
Date de publication
09/01/2017
Peer-reviewed
Oui
Volume
27
Numéro
1
Pages
120-127
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
Small increases in ambient temperature can elicit striking effects on plant architecture, collectively termed thermomorphogenesis [1]. In Arabidopsis thaliana, these include marked stem elongation and leaf elevation, responses that have been predicted to enhance leaf cooling [2-5]. Thermomorphogenesis requires increased auxin biosynthesis, mediated by the bHLH transcription factor PHYTOCHROME-INTERACTING FACTOR 4 (PIF4) [6-8], and enhanced stability of the auxin co-receptor TIR1, involving HEAT SHOCK PROTEIN 90 (HSP90) [9]. High-temperature-mediated hypocotyl elongation additionally involves localized changes in auxin metabolism, mediated by the indole-3-acetic acid (IAA)-amido synthetase Gretchen Hagen 3 (GH3).17 [10]. Here we show that ultraviolet-B light (UV-B) perceived by the photoreceptor UV RESISTANCE LOCUS 8 (UVR8) [11] strongly attenuates thermomorphogenesis via multiple mechanisms inhibiting PIF4 activity. Suppression of thermomorphogenesis involves UVR8 and CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1)-mediated repression of PIF4 transcript accumulation, reducing PIF4 abundance. UV-B also stabilizes the bHLH protein LONG HYPOCOTYL IN FAR RED (HFR1), which can bind to and inhibit PIF4 function. Collectively, our results demonstrate complex crosstalk between UV-B and high-temperature signaling. As plants grown in sunlight would most likely experience concomitant elevations in UV-B and ambient temperature, elucidating how these pathways are integrated is of key importance to the understanding of plant development in natural environments.
Mots-clé
Arabidopsis/growth & development, Arabidopsis/metabolism, Arabidopsis/radiation effects, Arabidopsis Proteins/genetics, Arabidopsis Proteins/metabolism, Basic Helix-Loop-Helix Transcription Factors/genetics, Basic Helix-Loop-Helix Transcription Factors/metabolism, Chromosomal Proteins, Non-Histone/genetics, Chromosomal Proteins, Non-Histone/metabolism, Gene Expression Regulation, Plant/radiation effects, Hot Temperature, Plant Stems/growth & development, Plant Stems/metabolism, Plant Stems/radiation effects, Ubiquitin-Protein Ligases/genetics, Ubiquitin-Protein Ligases/metabolism, Ultraviolet Rays/adverse effects, Arabidopsis, HFR1, PIF4, UV-B, UVR8, auxin, high temperature, hypocotyl
Pubmed
Web of science
Open Access
Oui
Création de la notice
29/12/2016 9:32
Dernière modification de la notice
20/08/2019 13:08
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