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Arabidopsis RUP2 represses UVR8-mediated flowering in noninductive photoperiods.

  • Arongaus AB Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva 4, Switzerland.
  • Chen S Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva 4, Switzerland.
  • Pireyre M Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva 4, Switzerland.
  • Glöckner N Department of Plant Physiology, Center for Plant Molecular Biology (ZMBP), University of Tübingen, 72076 Tübingen, Germany.
  • Galvão VC Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, 1015 Lausanne, Switzerland.
  • Albert A Research Unit Environmental Simulation, Helmholtz Zentrum München, 85764 Neuherberg, Germany.
  • Winkler JB Research Unit Environmental Simulation, Helmholtz Zentrum München, 85764 Neuherberg, Germany.
  • Fankhauser C Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, 1015 Lausanne, Switzerland.
  • Harter K Department of Plant Physiology, Center for Plant Molecular Biology (ZMBP), University of Tübingen, 72076 Tübingen, Germany.
  • Ulm R Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva 4, Switzerland.
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  • 2018-09-27
Published in:
  • Genes & development. - 2018
Arabidopsis
UV-B photoreceptor
UVR8
flowering
photoperiodism
plant–environment interaction
sun simulator
Arabidopsis
Arabidopsis Proteins
Chromosomal Proteins, Non-Histone
DNA-Binding Proteins
Flowers
Photoperiod
Promoter Regions, Genetic
Transcription Factors
Ultraviolet Rays
English 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.
Language
  • English
Open access status
gold
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Persistent URL
https://sonar.ch/global/documents/194517
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