All in good time: The Arabidopsis circadian clock

Simon Barak, Elaine M. Tobin, Rachel M. Green*, Christos Andronis, Shoji Sugano

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

127 Scopus citations


Biological time-keeping mechanisms have fascinated researchers since the movement of leaves with a daily rhythm was first described >270 years ago. The circadian clock confers a 24-hour rhythm on a range of processes including leaf movements and the expression of some genes. Molecular mechanisms and components underlying clock function have been described in recent years for several animal and prokaryotic organisms, and those of plants are beginning to be characterized. The emerging model of the Arabidopsis clock has mechanistic parallels with the clocks of other model organisms, which consist of positive and negative feedback loops, but the molecular components appear to be unique to plants.

Original languageAmerican English
Pages (from-to)517-522
Number of pages6
JournalTrends in Plant Science
Issue number12
StatePublished - 2000
Externally publishedYes

Bibliographical note

Funding Information:
We would like to thank Pam Green, Yair M. Heimer, May S. Ong and David Greenberg for their helpful comments and suggestions. We are also grateful to Margaret Kowalczyk for excellent technical assistance in preparing the figures. Many thanks to the three anonymous reviewers for their improvements to our manuscript. Our apologies to the many researchers whose work was not cited owing to space limitations. Our work was supported by National Institutes of Health (NIH) grant, GM-23167, to E.M.T.


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