Document Detail


Light-induced motility of thermophilic Synechococcus isolates from Octopus Spring, Yellowstone National Park.
MedLine Citation:
PMID:  11536814     Owner:  NASA     Status:  MEDLINE    
Abstract/OtherAbstract:
This study demonstrates light-induced motility of two thermophilic Synechococcus isolates that are morphologically similar but that belong to different cyanobacterial lineages. Both isolates migrated away from densely inoculated streaks to form fingerlike projections extending toward or away from the light source, depending on the light intensity. However, the two isolates seemed to prefer widely different light conditions. The behavior of each isolate was controlled by several factors, including temperature, preacclimation of inocula, acclimation during the experiment, and strain-specific genetic preferences for different light conditions (adaptation). Time-lapse microscopy confirmed that these projections were formed by actively gliding cells and were not simply the outcome of directional cell division. The observed motility rates of individual cells of 0.1 to 0.3 micrometers s-1 agreed well with the distance traversed by the projections, 0.3 to 0.5 mm h-1, suggesting that most cells in each projection are travelling in the same direction. The finding of motility among two phylogenetically unaffiliated unicellular cyanobacteria suggests that this trait may be widespread among this group. If so, this would have important implications for experiments on colonization, succession, diel positioning, and photosynthetic activity in hot spring mats dominated by Synechococcus-like cyanobacteria.
Authors:
N B Ramsing; M J Ferris; D M Ward
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Applied and environmental microbiology     Volume:  63     ISSN:  0099-2240     ISO Abbreviation:  Appl. Environ. Microbiol.     Publication Date:  1997 Jun 
Date Detail:
Created Date:  2000-07-08     Completed Date:  2000-07-08     Revised Date:  2010-09-14    
Medline Journal Info:
Nlm Unique ID:  7605801     Medline TA:  Appl Environ Microbiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2347-54     Citation Subset:  S    
Affiliation:
Department of Microbiology, Montana State University, Bozeman 59717, USA. soek@pop.bio.aau.dk
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MeSH Terms
Descriptor/Qualifier:
Cyanobacteria / classification,  physiology*,  radiation effects*
Hot Temperature
Light*
Locomotion / physiology,  radiation effects*
Temperature
Water Microbiology*
Wyoming
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