期刊
GENES & DEVELOPMENT
卷 32, 期 19-20, 页码 1332-1343出版社
COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT
DOI: 10.1101/gad.318592.118
关键词
sun simulator; plant-environment interaction; photoperiodism; flowering; UV-B photoreceptor; UVR8; Arabidopsis
资金
- University of Geneva
- Swiss National Science Foundation [31003A_ 175774, CRSII3_154438]
- European Research Council (ERC) under the European Union's Seventh Framework Programme [310539]
- German Research Foundation [CRC 1101-D02]
- EMBO long-term fellowship [ALTF 293-2013]
- Swiss National Science Foundation (SNF) [31003A_175774] Funding Source: Swiss National Science Foundation (SNF)
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 PHOTOMOR-PHOGENESIS 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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