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Related Experiment Videos

Gravity sensing by plants.

P Larsen1

  • 1Plantefysiologisk Institut, Aarhus University, Denmark.

Life Sciences and Space Research
|January 1, 1973
PubMed
Summary
This summary is machine-generated.

Plants sense gravity using specialized "gravity sensors" called statoliths. These subcellular bodies direct plant growth by regulating cell walls and transmitting signals within plant organs.

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Area of Science:

  • Plant Biology
  • Biophysics
  • Cell Biology

Background:

  • Gravity influences plant orientation and growth.
  • Specific cellular mechanisms for gravity perception are not fully understood.
  • Statoliths are hypothesized as key gravity-sensing organelles.

Purpose of the Study:

  • To present evidence for the role of statoliths as gravity sensors in plants.
  • To elucidate the mechanism by which statoliths regulate plant growth and orientation.
  • To investigate the effects of gravity on cellular processes in plant organs.

Main Methods:

  • Observation of statolith behavior in response to gravitational reorientation.
  • Analysis of cell wall growth regulation in response to statolith activity.

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  • Examination of signal transmission from statoliths to growing regions in multicellular structures.

    • Main Results:

    • Statoliths, subcellular bodies, reorient with changes in gravitational direction.
    • In Chara rhizoids, statoliths directly regulate cell wall growth by controlling carrier access.
    • In multicellular organs, statoliths (likely amyloplasts) establish transversal polarity transmitted to growth zones.
    • Gravity also induces "tonic effects" that quantitatively modulate organ responses.

    Conclusions:

    • Statoliths are confirmed as critical gravity sensors in plants.
    • The mechanism involves direct regulation of cell wall synthesis and indirect signal transduction.
    • Gravity perception is fundamental to plant development and organ orientation.