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Genes Dev. 2018 Oct 1;32(19-20):1332-1343. doi: 10.1101/gad.318592.118. Epub 2018 Sep 25.

Arabidopsis RUP2 represses UVR8-mediated flowering in noninductive photoperiods.

Author information

1
Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva 4, Switzerland.
2
Department of Plant Physiology, Center for Plant Molecular Biology (ZMBP), University of Tübingen, 72076 Tübingen, Germany.
3
Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, 1015 Lausanne, Switzerland.
4
Research Unit Environmental Simulation, Helmholtz Zentrum München, 85764 Neuherberg, Germany.
5
Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, 1211 Geneva 4, Switzerland.

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:

Arabidopsis; UV-B photoreceptor; UVR8; flowering; photoperiodism; plant–environment interaction; sun simulator

PMID:
30254107
PMCID:
PMC6169840
DOI:
10.1101/gad.318592.118
[Indexed for MEDLINE]
Free PMC Article

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