First published online November 14, 2002; 10.1104/pp.007625
Plant Physiol, December 2002, Vol. 130, pp. 1770-1775
Independent Control of Gibberellin Biosynthesis and Flowering
Time by the Circadian Clock in Arabidopsis1
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.)
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.
1
This work was supported by the Spanish Ministry
of Science (grant no. BIO2001-1558 to M.A.B.), by the National Science
Foundation (grant no. MCB-0078277 to D.W.), by the U.S. Department of
Agriculture (grant no. 99-35301-8047 to D.W.), by the Human Frontiers
Science Program Organization (grant no. RGP0235/2001-M to D.W. and
fellowship to M.A.B.), and by the Spanish Ministry of Education
(fellowship to M.A.B.). D.W. is a Director of the Max Planck Institute.
*
Corresponding author; e-mail mblazquez{at}ibmcp.upv.es; fax
34-96-3877859.
© 2002 American Society of Plant Biologists
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