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The avoidance response in Phycomyces.

D L Johnson, R I Gamow

The Journal of General Physiology

|January 1, 1971

Summary

This summary is machine-generated.

Phycomyces sporangiophores exhibit an avoidance response to stationary objects. This growth behavior is potentially mediated by a growth-stimulating gas, possibly water vapor, accumulating on the leeward side.

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Area of Science:

Plant biology
Mycology
Biophysics

Background:

Phycomyces sporangiophores display an avoidance response to stationary objects.
This response involves directional growth away from obstacles.

Purpose of the Study:

To investigate the mechanism behind the avoidance response in Phycomyces sporangiophores.
To identify the potential signaling molecule responsible for this growth behavior.

Main Methods:

Observational studies of Phycomyces sporangiophore growth in proximity to stationary objects.
Analysis of gas dynamics and concentration around the sporangiophore.
Indirect evidence collection to identify the nature of the emitted gas.

Main Results:

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A growth-stimulating gas is emitted from the sporangiophore.
Air currents concentrate this gas on the leeward side.
Stationary barriers alter gas distribution, influencing growth direction.
Indirect evidence suggests the gas is water vapor.

Conclusions:

The avoidance response is likely mediated by uneven gas concentration.
Differential growth on the leeward side, due to gas accumulation, drives the avoidance behavior.
Water vapor is a probable candidate for the growth-stimulating gas.