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A Quantitative Study of Cellular Rheotropism.

D Müller, L Jaffe

Biophysical Journal

|May 12, 2009

Summary

Botrytis spores exhibit downstream germination in laminar flow, a rheotropic response influenced by a diffusible stimulator. This finding reveals insights into fungal growth dynamics and environmental responses.

Area of Science:

Mycology
Biophysics

Background:

Botrytis spores exhibit directional germination patterns in response to fluid flow.
Understanding spore behavior is crucial for controlling fungal diseases.

Purpose of the Study:

To investigate the rheotropic response of Botrytis spores in a laminar flow chamber.
To elucidate the mechanism and characteristics of the diffusible stimulator involved in spore germination.

Main Methods:

Sparsely sowing Botrytis spores on a wall within a laminar flow chamber.
Measuring spore germination orientation at varying flow velocities (0.1 to 1000 mu/second).
Analyzing the relationship between flow rate, stimulator diffusion, and germination.

Main Results:

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Spores showed a tendency to germinate downstream, with orientation correlating to flow velocity (approx. 9 * log(10 v(infinity))).

Evidence suggests a diffusible stimulator mediates this rheotropic response via convection.

The stimulator is macromolecular (diffusion constant ~10(-7) cm(2)/second) with a short half-life (~10 seconds).

Conclusions:

Botrytis spore germination is influenced by fluid dynamics through a self-emitted diffusible signal.
The stimulator's properties suggest a localized signaling mechanism.
Germination rate is less sensitive to stimulator concentration than growth localization.