Arabidopsis RUP2 represses UVR8-mediated flowering in noninductive photoperiods
- Adriana B. Arongaus1,
- Song Chen1,
- Marie Pireyre1,
- Nina Glöckner2,
- Vinicius C. Galvão3,
- Andreas Albert4,
- J. Barbro Winkler4,
- Christian Fankhauser3,
- Klaus Harter2 and
- Roman Ulm1,5
- 1Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva 4, Switzerland;
- 2Department of Plant Physiology, Center for Plant Molecular Biology (ZMBP), University of Tübingen, 72076 Tübingen, Germany;
- 3Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, 1015 Lausanne, Switzerland;
- 4Research Unit Environmental Simulation, Helmholtz Zentrum München, 85764 Neuherberg, Germany;
- 5Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, 1211 Geneva 4, Switzerland
- Corresponding author: roman.ulm{at}unige.ch
Abstract
Plants have evolved complex photoreceptor-controlled mechanisms to sense and respond to seasonal changes in day length. This ability allows plants to optimally time the transition from vegetative growth to flowering. UV-B is an important part intrinsic to sunlight; however, whether and how it affects photoperiodic flowering has remained elusive. Here, we report that, in the presence of UV-B, genetic mutation of REPRESSOR OF UV-B PHOTOMORPHOGENESIS 2 (RUP2) renders the facultative long day plant Arabidopsis thaliana a day-neutral plant and that this phenotype is dependent on the UV RESISTANCE LOCUS 8 (UVR8) UV-B photoreceptor. We provide evidence that the floral repression activity of RUP2 involves direct interaction with CONSTANS, repression of this key activator of flowering, and suppression of FLOWERING LOCUS T transcription. RUP2 therefore functions as an essential repressor of UVR8-mediated induction of flowering under noninductive short day conditions and thus provides a crucial mechanism of photoperiodic flowering control.
Keywords
- sun simulator
- plant–environment interaction
- photoperiodism
- flowering
- UV-B photoreceptor
- UVR8
- Arabidopsis
Footnotes
-
Supplemental material is available for this article.
-
Article published online ahead of print. Article and publication date are online at http://www.genesdev.org/cgi/doi/10.1101/gad.318592.118.
-
Freely available online through the Genes & Development Open Access option.
- Received July 5, 2018.
- Accepted August 17, 2018.
This article, published in Genes & Development, is available under a Creative Commons License (Attribution-NonCommercial 4.0 International), as described at http://creativecommons.org/licenses/by-nc/4.0/.
