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

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9 janvier 2017

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Serveur académique Lausannois

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Ce document est lié à :
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.cub.2016.11.004

Ce document est lié à :
info:eu-repo/semantics/altIdentifier/pmid/27989670

Ce document est lié à :
info:eu-repo/semantics/altIdentifier/eissn/1879-0445

Ce document est lié à :
info:eu-repo/semantics/altIdentifier/urn/urn:nbn:ch:serval-BIB_28E55A0D63499

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Serveur Académique Lausannois

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Université de Lausanne et CHUV

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info:eu-repo/semantics/openAccess , Copying allowed only for non-profit organizations , https://serval.unil.ch/disclaimer

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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

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Stenophragma

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S. Hayes et al., « UV-B Perceived by the UVR8 Photoreceptor Inhibits Plant Thermomorphogenesis. », Serveur académique Lausannois, ID : 10.1016/j.cub.2016.11.004

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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.

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