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Related Experiment Videos

Graviperception and gravitaxis in algae.

D P Hader1, M Lebert

  • 1Institut fur Botanik and Pharmazeutische Biologie der Friedrich-Alexander-Universitat, Staudstr. 5, D-91058 Erlangen, Germany.

Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)
|October 12, 2001
PubMed
Summary
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Photosynthetic flagellates exhibit gravitaxis, orienting themselves in response to gravity. This study reveals that calcium ion influx through mechanosensitive channels is key to their graviorientation mechanism.

Area of Science:

  • Cell Biology
  • Biophysics
  • Photobiology

Background:

  • Photosynthetic flagellates are model organisms for studying graviperception.
  • Gravitaxis, or gravity orientation, has been observed for decades but its molecular basis remained elusive.
  • Previous hypotheses focused on passive buoyancy mechanisms for cell orientation.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying gravitaxis in photosynthetic flagellates.
  • To investigate the role of calcium ions and cyclic AMP in the graviorientation process.
  • To identify specific cellular components involved in sensing and responding to gravity.

Main Methods:

  • Utilized Euglena gracilis as a model organism.
  • Investigated the effect of cell density and membrane interactions on graviorientation.

Related Experiment Videos

  • Employed fluorescence microscopy with Calcium Crimson to visualize calcium influx.
  • Assessed the impact of calcium channel inhibitors, ionophores, and caffeine on gravitaxis.

    • Main Results:

    • The whole cell body of Euglena gracilis is denser than the medium, activating mechanosensitive ion channels.
    • Calcium influx into the cell, visualized by Calcium Crimson, occurs during reorientation.
    • Inhibitors of calcium channels and ionophores disrupt gravitaxis.
    • Caffeine, a phosphodiesterase inhibitor, enhances the precision of gravitaxis.

    Conclusions:

    • Gravitaxis in Euglena gracilis is mediated by the activation of mechanosensitive calcium channels due to cell density.
    • Calcium influx and cyclic AMP signaling pathways are crucial for precise graviorientation.
    • This study reveals a novel molecular mechanism for gravity perception in unicellular organisms.