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Avoidance of Phycomyces in a controlled environment.

P W Meyer, I J Matus, H C Berg

    Biophysical Journal
    |March 1, 1987
    PubMed
    Summary
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    The fungus Phycomyces bends away from objects without touching them. This avoidance mechanism is not due to wind but likely involves gas exchange between the fungus and nearby surfaces.

    Area of Science:

    • Mycology
    • Plant Physiology
    • Biophysics

    Background:

    • The sporangiophore of Phycomyces exhibits avoidance behavior, bending away from nearby objects.
    • Previous hypotheses suggested aerodynamic interactions with wind as the cause.

    Purpose of the Study:

    • To test the hypothesis that wind damping causes Phycomyces avoidance.
    • To investigate the underlying mechanism of this unique growth response.

    Main Methods:

    • Experiments were conducted in a controlled environmental chamber with suppressed convection.
    • Variables controlled included air pressure, temperature, relative humidity, electrostatic charge, and light.
    • Avoidance rates were measured under varying conditions and distances from objects.

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    Main Results:

    • Avoidance occurred at normal rates even without random winds, disproving the aerodynamic hypothesis.
    • Relative humidity had a minor effect on avoidance rates.
    • Avoidance from a thin glass fiber was similar to a planar sheet at close distances, but decreased faster with distance.

    Conclusions:

    • Phycomyces avoidance is not mediated by passive reflection or wind damping.
    • The mechanism likely involves either adsorption of an inhibiting substance or emission of a promoting substance by the barrier.