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Related Experiment Videos

Threshold and adaptation in Phycomyces. Their interrelation and regulation by light.

P Galland, V E Russo

    The Journal of General Physiology
    |July 1, 1984
    PubMed
    Summary

    The light sensitivity of Phycomyces sporangiophores depends on prior light conditions. Dark-grown fungi exhibit lower light thresholds and faster bending rates, indicating a strong link between growth environment and phototropism.

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    Area of Science:

    • Mycology
    • Plant Physiology
    • Photobiology

    Background:

    • Phycomyces sporangiophores exhibit phototropism, a growth response to light.
    • Understanding light sensitivity is crucial for deciphering phototropic mechanisms.

    Purpose of the Study:

    • To determine the absolute light sensitivity of Phycomyces sporangiophores.
    • To investigate the influence of pre-experimental light conditions on phototropic responses.

    Main Methods:

    • Analyzing intensity dependence of phototropic bending rate.
    • Assessing light and dark growth responses to light intensity changes.
    • Comparing wild-type and behavioral mutants (madA, madB, madC).

    Main Results:

    • Pre-growth illumination significantly affects light sensitivity thresholds and maximal bending rates.

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  • Dark-grown wild-type Phycomyces show lower thresholds (10⁻⁹ W/m²) and higher bending rates.
  • Light-grown sporangiophores have increased diameter and growth rate, with slower dark adaptation kinetics.

    • Conclusions:

    • Prior light conditions are critical for accurate light sensitivity measurements in Phycomyces.
    • A positive correlation exists between slower dark adaptation and higher bending rate thresholds.
    • Behavioral mutants display varying degrees of indifference to light-controlled growth parameters.