Journal
FUNGAL GENETICS AND BIOLOGY
Volume 42, Issue 6, Pages 528-533Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.fgb.2005.03.008
Keywords
ascospore discharge; perithecia; turgor pressure; mannitol; Reynolds number; Stokes' Law
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Since wind speed drops to zero at a surface, forced ejection should facilitate spore dispersal. But for tiny spores, with low mass relative to surface area, high ejection speed yields only a short range trajectory, so pernicious is their drag. Thus, achieving high speeds requires prodigious accelerations. In the ascomycete Gibberella zeae, we determined the launch speed and kinetic energy of ascospores shot from perithecia, and the source and magnitude of the pressure driving the launch. We asked whether the pressure inside the ascus suffices to account for launch speed and energy. Launch speed was 34.5 m s(-1) requiring a pressure of 1.54 MPa and an acceleration of 870,000 g-the highest acceleration reported in a biological system. This analysis allows us to discount the major sugar component of the epiplasmic fluid, mannitol.. as having a key role in driving discharge.. and supports the role of potassium ion flux in the mechanism. (c) 2005 Elsevier Inc. All rights reserved.
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