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The Plant Circadian Oscillator.

C Robertson McClung1

  • 1Department of Biological Sciences, Dartmouth College, Hanover, NH 03755, USA. c.robertson.mcclung@dartmouth.edu.

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Plants possess intricate circadian clocks regulating vital functions like photosynthesis and stress resistance. Understanding this complex regulatory network offers new avenues for crop improvement through targeted breeding.

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Area of Science:

  • Plant Biology
  • Chronobiology
  • Molecular Genetics

Background:

  • Plant biology exhibits extensive circadian rhythmicity affecting numerous physiological processes.
  • The plant circadian oscillator is a complex network of transcriptional feedback loops.
  • Post-transcriptional mechanisms like alternative splicing and regulated protein stability also contribute to circadian control.

Purpose of the Study:

  • To review the current understanding of the regulatory network governing the plant circadian oscillator.
  • To highlight the complexity and robustness of the plant circadian system.
  • To explore the potential of the circadian clock as a target for crop domestication and breeding.

Main Methods:

  • Literature review focusing on molecular and genetic studies of plant circadian rhythms.
  • Analysis of transcriptional and post-transcriptional regulatory mechanisms.
  • Examination of the role of the circadian clock in plant adaptation and crop improvement.

Main Results:

  • The plant circadian oscillator is a sophisticated network of interlocked transcriptional feedback loops.
  • Post-transcriptional modifications play a crucial role in fine-tuning circadian outputs.
  • The complexity of the oscillator ensures robust rhythmicity under environmental extremes.

Conclusions:

  • The plant circadian clock is a complex, multi-layered regulatory system essential for plant adaptation.
  • Understanding this network provides targets for improving crop performance through breeding and domestication.