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Related Experiment Videos

Dynamics of root growth in microgravity.

A Johnsson1, C Karlsson, D K Chapman

  • 1Department of Physics, University of Trondheim, Dragvoll, Norway.

Journal of Biotechnology
|June 27, 1996
PubMed
Summary

Garden cress roots exhibited random growth patterns in microgravity, aligning with random walk theory predictions. This study details the technological innovations enabling these microgravity root growth experiments.

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Area of Science:

  • Space biology
  • Plant physiology
  • Microgravity research

Background:

  • Investigating plant root growth in microgravity is crucial for understanding fundamental biological processes and for future space exploration.
  • Previous hypotheses suggested root growth in the absence of gravity would follow random walk theory.

Purpose of the Study:

  • To test the random walk hypothesis for garden cress root growth in microgravity.
  • To detail the technological advancements enabling in-space root growth studies.
  • To assess the efficacy of in-orbit fixation methods for plant material.

Main Methods:

  • Utilized the ESA Biorack on the IML-2 flight (July 1994) for the RANDOM experiment.
  • Developed specialized plant chambers and containers for seed growth between agar slices.

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  • Employed time-lapse photography (hourly) to record root movements and developed glutaraldehyde fixation techniques.

    • Main Results:

    • Observed root growth patterns confirmed predictions from the random walk approach.
    • Average changes in growth direction remained constant (zero), while squared angular deviations increased proportionally with time.
    • In-orbit prefixed plant material was successfully preserved for post-flight microscopy analysis.

    Conclusions:

    • The RANDOM experiment successfully validated the random walk theory for microgravity root growth.
    • Technological solutions for in-space plant studies, including fixation, were demonstrated.
    • While fixation quality had limitations, the experiment achieved its primary objectives in studying root behavior under microgravity.