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- Title
Photoreceptor regulation of CONSTANS protein in photoperiodic flowering.
- Authors
Valverde, Federico; Mouradov, Aidyn; Soppe, Wim; Ravenscroft, Dean; Samach, Alon; Coupland, George
- Abstract
Many plants flower in response to seasonal fluctuations in day length. The CONSTANS (CO) gene of Arabidopsis promotes flowering in long days. Flowering is induced when CO messenger RNA expression coincides with the exposure of plants to light. However, how this promotes CO activity is unknown. We show that light stabilizes nuclear CO protein in the evening, whereas in the morning or in darkness the protein is degraded by the proteasome. Photoreceptors regulate CO stability and act antagonistically to generate daily rhythms in CO abundance. This layer of regulation refines the circadian rhythm in CO messenger RNA and is central to the mechanism by which day length controls flowering.
- Publication
Science (New York, N.Y.), 2004, Vol 303, Issue 5660, p1003
- ISSN
1095-9203
- Publication type
Journal Article
- DOI
10.1126/science.1091761