Plant Physiology Preview
Published on November 14, 2002; 10.1104/pp.007625
Received May 7, 2002
Returned for revision June 24, 2002
Accepted August 1, 2002
Independent Control of Gibberellin Biosynthesis and Flowering Time by the Circadian Clock in Arabidopsis
Miguel A. Blázquez *, Marta Trénor , and Detlef Weigel
Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia), 46022 Valencia, Spain (M.A.B., M.T.); Plant Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037 (D.W.); and Department of Molecular Biology, Max Planck Institute for Developmental Biology, D-72076 Tübingen, Germany (D.W.)
* Corresponding author; email: mblazquez{at}ibmcp.upv.es.
Flowering of the facultative long-day plant Arabidopsis is controlled by several endogenous and environmental factors, among them gibberellins (GAs) and day length. The promotion of flowering by long days involves an endogenous clock that interacts with light cues provided by the environment. Light, and specifically photoperiod, is also known to regulate the biosynthesis of GAs, but the effects of GAs and photoperiod on flowering are at least partially separable. Here, we have used a short-period mutant, toc1, to investigate the role of the circadian clock in the control of flowering time by GAs and photoperiod. We show that toc1 affects expression of several floral regulators and a GA biosynthetic gene, but that these effects are independent.
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