Document Detail


The fern sporangium: a unique catapult.
MedLine Citation:
PMID:  22422975     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
Various plants and fungi have evolved ingenious devices to disperse their spores. One such mechanism is the cavitation-triggered catapult of fern sporangia. The spherical sporangia enclosing the spores are equipped with a row of 12 to 13 specialized cells, the annulus. When dehydrating, these cells induce a dramatic change of curvature in the sporangium, which is released abruptly after the cavitation of the annulus cells. The entire ejection process is reminiscent of human-made catapults with one notable exception: The sporangia lack the crossbar that arrests the catapult arm in its returning motion. We show that much of the sophistication and efficiency of the ejection mechanism lies in the two very different time scales associated with the annulus closure.
Authors:
X Noblin; N O Rojas; J Westbrook; C Llorens; M Argentina; J Dumais
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  335     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-03-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1322     Citation Subset:  IM    
Affiliation:
Université de Nice Sophia Antipolis (UNS), Laboratoire de Physique de la Matière Condensée, CNRS UMR 7336, Nice, France. xavier.noblin@unice.fr
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