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

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Abstract
The sporangiophore of Phycomyces shows a transient response to a double barrier, the avoidance growth response. Tensile tests conducted on the stage IV sporangiophore demonstrate that an increase in mechanical extensibility occurs about a minute after a double barrier stimulus. This change in mechanical extensibility is similar to the one that occurs after a light stimulus. Apparently the avoidance stimulus occurs somewhere on the same pathway between the photoreceptor mechanism and the final growth response.