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Gravitaxis in Flagellates and Ciliates

  • Donat-Peter Häder
  • Ruth Hemmersbach
Chapter
Part of the SpringerBriefs in Space Life Sciences book series (BRIEFSSLS)

Abstract

Motile microorganisms such as flagellates and ciliates use the gravity vector of the Earth to adjust their position in the water column. Oriented movement by gravity is called gravitaxis and can be positive (downward swimming) or negative (upward swimming). In addition, some ciliates modify their velocity according to the swimming direction (gravikinesis). Earth-bound research and experimentation under simulated and real microgravity have revealed that a heavy mass such as a statolith or the whole cell content presses onto a gravireceptor which perceives the signal. In some cases mechanosensitive ion channels have been identified as gravireceptors. The activation of the receptor results in a cascade of reactions which amplify the signal and result in a steering response changing the direction of movement.

Keywords

Ciliates Flagellates Gravitaxis Gravikinesis Mechanosensitive ion channels Sensory transduction chain 

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Copyright information

© The Author(s), under exclusive licence to Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Donat-Peter Häder
    • 1
  • Ruth Hemmersbach
    • 2
  1. 1.Emeritus from Friedrich-Alexander UniversityErlangen-NürnbergGermany
  2. 2.Institute of Aerospace Medicine, Gravitational Biology, German Aerospace Center (DLR)CologneGermany

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