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Title

UV-B Perceived by the UVR8 Photoreceptor Inhibits Plant Thermomorphogenesis

Authors
Hayes, Scott
Sharma, Ashutosh
Fraser, Donald P
Trevisan, Martine
Cragg-Barber, C Kester
Fankhauser, Christian
Jenkins, Gareth I
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Published in Current Biology. 2017, vol. 27, no. 1, p. 120-127
Abstract 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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PMID: 27989670
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Research group Groupe Ulm
Project FNS: CRSII3_154438
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HAYES, Scott et al. UV-B Perceived by the UVR8 Photoreceptor Inhibits Plant Thermomorphogenesis. In: Current Biology, 2017, vol. 27, n° 1, p. 120-127. https://archive-ouverte.unige.ch/unige:92500

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Deposited on : 2017-03-13

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