Skip to content

UV-B perceived by the UVR8 photoreceptor inhibits plant thermomorphogenesis

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)120-127
Number of pages8
JournalCurrent Biology
Issue number1
Early online date15 Dec 2016
DateAccepted/In press - 1 Nov 2016
DateE-pub ahead of print - 15 Dec 2016
DatePublished (current) - 9 Jan 2017


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 which 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 localised 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 LOCUS8 (UVR8) [11] strongly attenuates thermomorphogenesis via multiple mechanisms inhibiting PIF4 activity. Suppression of thermomorphogenesis involves UVR8 and CONSTITUTIVELY PHOTOMORPHOGENIC1 (COP1)-mediated repression of PIF4 transcript accumulation, reducing PIF4 abundance. UV-B also stabilises 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 signalling. As plants grown in sunlight would likely experience concomitant elevations in UV-B and ambient temperature, elucidating how these pathways are integrated is of key importance to understanding of plant development in natural environments.

Download statistics

No data available



  • Full-text PDF (final published version)

    Rights statement: This is the final published version of the article (version of record). It first appeared online via Elsevier (Cell Press) at Please refer to any applicable terms of use of the publisher.

    Final published version, 2.17 MB, PDF document

    Licence: CC BY


View research connections

Related faculties, schools or groups