Scientific article
Open access

Arabidopsis RUP2 represses UVR8-mediated flowering in noninductive photoperiods

Published inGenes and Development, vol. 32, no. 19-20, p. 1332-1343
Publication date2018

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.

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Citation (ISO format)
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
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Article (Published version)
ISSN of the journal0890-9369

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