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Ultradian rhythms in Desmodium

W Engelmann1, B Antkowiak

  • 1Physiologische Okologie der Pflanzen, Institut für Botanik, Universität Tübingen, Germany. engelmann@uni-tuebingen.de

Chronobiology International
|August 26, 1998
PubMed
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Desmodium gyrans leaflet movements result from motor cell swelling and shrinking. A physiological model explains ultradian movements via ion pump and channel activity, distinct from circadian leaf movements.

Area of Science:

  • Plant Physiology
  • Biophysics
  • Cellular Biology

Background:

  • Desmodium gyrans exhibits distinct circadian and ultradian leaf movements.
  • These movements are controlled by specialized motor cells within pulvini.
  • The underlying physiological mechanisms require detailed investigation.

Purpose of the Study:

  • To describe the anatomy of Desmodium gyrans lateral pulvini.
  • To develop a physiological model for the ultradian leaflet movements.
  • To investigate the roles of ion transport, calcium, and signaling pathways.

Main Methods:

  • Anatomical description of pulvini.
  • Electrophysiological recordings using microelectrodes.
  • Pharmacological treatments targeting ion channels and signaling pathways.

Related Experiment Videos

  • Development of a coupled oscillator model.

    • Main Results:

    • A physiological model was developed, explaining ultradian movement via pump-depolarization cycles in motor cells.
    • Ion uptake/efflux drives water movement, causing motor cell swelling/shrinking.
    • Calcium and phosphatidyl inositol signaling likely play roles; coupled oscillator models show promise.

    Conclusions:

    • Ultradian leaflet movement in Desmodium is regulated by distinct physiological mechanisms involving ion transport and cellular oscillations.
    • Circadian and ultradian movements appear to be controlled by different pathways.
    • Further research may reveal similar oscillatory mechanisms in other biological systems.