Document Detail

The role of osmotic pressure in the germination of Nosema algerae spores.
MedLine Citation:
PMID:  2086785     Owner:  NLM     Status:  MEDLINE    
Both the lag period and the time required for the filament and sporoplasm to emerge from Nosema algerae spores were prolonged when germination occurred under hyperosmotic conditions. Polyethylene glycol (PEG) and sucrose inhibited germination, first by preventing eversion of the filament, and then at higher concentrations by preventing stimulation. The size of the spore cases decreased by about 21% following germination, indicating an elastic spore wall and turgor pressure in the dormant spores. Increased pressure during germination was indicated by less osmotically-induced shrinkage in stimulated than in dormant spores and by higher concentration of solutes in the homogenates of germinated than ungerminated spores. These results are consistent with the hypothesis of a pressure increase during germination that is caused by an endogenous increase in solute concentration.
A H Undeen; E Frixione
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of protozoology     Volume:  37     ISSN:  0022-3921     ISO Abbreviation:  J. Protozool.     Publication Date:    1990 Nov-Dec
Date Detail:
Created Date:  1991-05-23     Completed Date:  1991-05-23     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  2985197R     Medline TA:  J Protozool     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  561-7     Citation Subset:  IM    
United States Department of Agriculture, Agricultural Research Service, Insects Affecting Man and Animals Research Laboratory, Gainesville, Florida 32604.
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MeSH Terms
Eukaryota / physiology*
Osmotic Pressure
Polyethylene Glycols
Reg. No./Substance:
0/Polyethylene Glycols; 57-50-1/Sucrose

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