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Related Experiment Videos

Comes a time.

C Robertson McClung1

  • 1Department of Biological Sciences, 6044 Gilman Laboratories, Dartmouth College, Hanover, NH 03755-3576, USA. mcclung@dartmouth.edu

Current Opinion in Plant Biology
|August 6, 2008
PubMed
Summary
This summary is machine-generated.

The plant circadian clock, a 24-hour oscillator, regulates gene expression and metabolism through complex feedback loops. This system integrates environmental signals to coordinate plant physiology.

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Chronobiology

Background:

  • The circadian clock is an endogenous biological oscillator with a ~24-hour period.
  • In plants like Arabidopsis, it involves intricate negative feedback loops at transcriptional, post-transcriptional, and post-translational levels.
  • Regulated proteolysis plays a crucial role in these feedback mechanisms.

Purpose of the Study:

  • To elucidate the mechanisms of the circadian clock in Arabidopsis.
  • To understand the extent of clock control over the transcriptome and metabolome.
  • To investigate the feedback of metabolites on clock function.

Main Methods:

  • Analysis of transcriptional and post-transcriptional regulation within the circadian clock.
  • Study of post-translational modifications, particularly regulated proteolysis.

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  • Examination of diurnal oscillations in transcriptomes and metabolomes under various environmental cycles.
  • Investigation of metabolite feedback on clock gene expression.

    • Main Results:

    • The Arabidopsis circadian clock utilizes interlocking negative feedback loops for regulation.
    • Clock control impacts a significant portion of the transcriptome (up to 90% in seedlings).
    • Diurnal oscillations are observed in enzyme activities and metabolites, though less pronounced than transcript oscillations.
    • Metabolites, including organic nitrogen intermediates, can feedback to influence clock function.

    Conclusions:

    • The plant circadian clock is a sophisticated system integrating environmental cues.
    • It plays a vital role in coordinating plant metabolism and physiology with daily environmental changes.
    • The clock acts as a central integrator of metabolic signals, linking internal rhythms with external conditions.