Plant Physiology Preview
Published on October 29, 2004; 10.1104/pp.104.042523
Received March 18, 2004
Returned for revision July 29, 2004
Accepted August 13, 2004
Circadian Rhythms of Ethylene Emission in Arabidopsis
Simon C. Thain , Filip Vandenbussche , Lucas J.J. Laarhoven , Mandy J. Dowson-Day , Zhi-Yong Wang , Elaine M. Tobin , Frans J.M. Harren , Andrew J. Millar , and Dominique Van Der Straeten *
Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, England, United Kingdom
Unit Plant Hormone Signaling and Bio-Imaging, Department of Molecular Genetics, University of Ghent, Belgium
Life Science Trace Gas Facility, Department of Molecular and Laser Physics, University of Nijmegen, The Netherlands
Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, California 90095-1606
* Corresponding author; email: Dominique.VanDerStraeten{at}ugent.be.
Ethylene controls multiple physiological processes in plants, including cell elongation. Consequently, ethylene synthesis is regulated by internal and external signals. We show that a light-entrained circadian clock regulates ethylene release from unstressed, wild-type Arabidopsis (Arabidopsis thaliana) seedlings, with a peak in the mid-subjective day. The circadian clock drives the expression of multiple ACC SYNTHASE genes, resulting in peak RNA levels at the phase of maximal ethylene synthesis. Ethylene production levels are tightly correlated with ACC SYNTHASE 8 steady-state transcript levels. The expression of this gene is controlled by light, by the circadian clock, and by negative feedback regulation through ethylene signaling. In addition, ethylene production is controlled by the TIMING OF CAB EXPRESSION 1 and CIRCADIAN CLOCK ASSOCIATED 1 genes, which are critical for all circadian rhythms yet tested in Arabidopsis. Mutation of ethylene signaling pathways did not alter the phase or period of circadian rhythms. Mutants with altered ethylene production or signaling also retained normal rhythmicity of leaf movement. We conclude that circadian rhythms of ethylene production are not critical for rhythmic growth.
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