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Related Experiment Videos

Phycomyces: An Increase in Mechanical Extensibility during the Avoidance Growth Response.

J K Ortega1

  • 1Department of Aerospace Engineering Sciences, University of Colorado, Boulder, Colorado 80309.

Plant Physiology
|November 1, 1977
PubMed
Summary

Phycomyces sporangiophores exhibit an avoidance growth response to stimuli. Mechanical tests reveal increased extensibility after a double barrier, suggesting a shared pathway with light responses.

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Area of Science:

  • * Botany
  • * Plant Physiology
  • * Biomechanics

Background:

  • * Phycomyces sporangiophores display a transient avoidance growth response when encountering obstacles.
  • * Previous research indicates light stimuli induce changes in sporangiophore mechanical properties.

Purpose of the Study:

  • * To investigate the mechanical changes in Phycomyces sporangiophores following a double barrier stimulus.
  • * To determine if the avoidance growth response shares a common pathway with light-induced growth responses.

Main Methods:

  • * Tensile tests were performed on stage IV sporangiophores of Phycomyces.
  • * Mechanical extensibility was measured after applying a double barrier stimulus.

Main Results:

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  • * A significant increase in mechanical extensibility was observed approximately one minute after the double barrier stimulus.
  • * The observed change in extensibility is comparable to that induced by light stimuli.

    • Conclusions:

    • * The avoidance stimulus, like light stimulus, appears to trigger a similar mechanical response in Phycomyces sporangiophores.
    • * Findings suggest that the avoidance stimulus and light stimulus converge on a common signaling pathway leading to altered growth.