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Statoliths pull on microfilaments: experiments under microgravity.

B Buchen1, M Braun, Z Hejnowicz

  • 1Botanisches Institut, Universitat Bonn.

Protoplasma
|January 1, 1993
PubMed
Summary
This summary is machine-generated.

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Weightless statoliths in Chara rhizoids normally move basipetally. Disorganizing microfilaments (MFs) with cytochalasin D prevented this movement, suggesting MFs generate forces essential for statolith dynamics.

Area of Science:

  • Plant cell biology
  • Gravitational biology
  • Cytoskeletal dynamics

Background:

  • Statoliths in Chara rhizoids exhibit basipetal movement during weightlessness.
  • A hypothesis proposed that gravity and microfilament (MF)-generated forces maintain statolith balance.

Purpose of the Study:

  • To test the hypothesis that MFs are crucial for statolith displacement under microgravity.
  • To investigate the role of microfilaments in statolith dynamics during altered gravity.

Main Methods:

  • Videomicroscopy of Chara rhizoids during parabolic rocket flights.
  • Treatment of rhizoids with cytochalasin D (CD) to disrupt microfilaments.
  • Chemical fixation of rhizoids post-microgravity phase for statolith localization.

Related Experiment Videos

Main Results:

  • Statoliths in CD-treated rhizoids remained at the apical cell wall during microgravity.
  • Untreated rhizoids showed significant basipetal displacement of statoliths.
  • Microgravity alone did not cause basipetal displacement in the absence of functional MFs.

Conclusions:

  • Microfilaments (MFs) play a critical role in the dynamic interaction with statoliths.
  • Shearing forces between MFs and statoliths are likely responsible for statolith movement.
  • The findings support a model where MFs actively influence statolith positioning.