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Arabidopsis RUP2 represses UVR8-mediated flowering in noninductive photoperiods

Glöckner, Nina
Galvão, Vinicius C
Albert, Andreas
Winkler, J Barbro
Fankhauser, Christian
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Published in Genes & development. 2018, vol. 32, no. 19-20, p. 1332-1343
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.
PMID: 30254107
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Research group Groupe Ulm
Swiss National Science Foundation: CRSII3_154438
Swiss National Science Foundation: 31003A_175774 & CRSII3_154438
Autre: 0310539
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ARONGAUS, Adriana Beatriz et al. Arabidopsis RUP2 represses UVR8-mediated flowering in noninductive photoperiods. In: Genes and Development, 2018, vol. 32, n° 19-20, p. 1332-1343. doi: 10.1101/gad.318592.118 https://archive-ouverte.unige.ch/unige:108828

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Deposited on : 2018-10-03

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