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Controlling Flowering Time

How plants measure day length and use it to synchronize flowering to the changing seasons has been of wide interest since photoperiodism was first described in the 1920s. Recently, major advances have been made in understanding the underlying mechanisms by using Arabidopsis and rice as models. In Arabidopsis, the CONSTANS transcription factor promotes flowering specifically in response to long days. Valverde et al. show how convergence between light signaling pathways and circadian control combine to generate the response to day length. They identified a new layer of control mechanisms by studying regulation of CONSTANS at the posttranscriptional level. (See the Perspective by Klejnot and Lin.) F. Valverde, A. Mouradov, W. Soppe, D. Ravenscroft, A. Samach, G. Coupland, Photoreceptor regulation of CONSTANS protein in photoperiodic flowering. Science 303, 1003-1006 (2004). [Abstract] [Full Text] J. Klejnot, C. Lin, A CONSTANS experience brought to light. Science 303, 965-966 (2004). [Summary] [Full Text]