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Updated: Aug 11, 2026
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Visualization of Germinosomes and the Inner Membrane in Bacillus subtilis Spores
Published on: April 15, 2019
The captured launch of a ballistospore
Anne Pringle1, Sheila N Patek, Mark Fischer
1Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138, USA. pringle@oeb.harvard.edu
Mycologia
|February 7, 2006
Summary
Ballistospore discharge, a key fungal dispersal mechanism, was visualized for the first time using ultra high-speed video. The study reveals surface tension release during Buller
Area of Science:
- Mycology
- Biomechanics
- Microbiology
Background:
- Ballistospore discharge is a widespread reproductive strategy in fungi, including mushrooms, yeasts, and plant pathogens.
- The rapid nature of spore release has historically prevented visualization of the underlying biomechanical process.
- Previous hypotheses suggested the coalescence of Buller's drop and the spore initiates discharge.
Purpose of the Study:
- To visualize and analyze the biomechanics of ballistospore discharge at unprecedented speeds.
- To elucidate the role of Buller's drop coalescence in spore dispersal.
- To investigate the physical forces driving rapid fungal spore launch.
Main Methods:
- Utilized ultra high-speed video recording at up to 100,000 frames per second.
- Recorded spore discharge events in Itersonilia perplexans (yeast) and Auricularia auricula (jelly fungus).
- Analyzed video data to determine the sequence of events and physical forces involved.
Main Results:
- Confirmed that ballistospore discharge is driven by the coalescence of Buller's drop and the spore.
- Observed that spore release can involve either drop collapse onto the spore or spore movement towards the drop.
- Quantified initial accelerations of ballistospores exceeding 10,000 g due to surface tension release.
Conclusions:
- Ballistospore discharge is a unique micromechanical process powered by surface tension.
- The rapid launch mechanism has no known parallel in other biological kingdoms.
- This fungal biology may inspire novel micro-motor technologies.
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