Document Detail


Electrophysiology of turgor regulation in marine siphonous green algae.
MedLine Citation:
PMID:  16909336     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We review electrophysiological measures of turgor regulation in some siphonous green algae, primarily the giant-celled marine algae, Valonia and Ventricaria, with particular comparison to the well studied charophyte algae Chara and Lamprothamnium. The siphonous green algae have a less negative plasma membrane potential, and are unlikely to have a proton-based chemiosmotic transport system, dominated by active electrogenic K(+) uptake. We also make note of the unusual cellular structure of the siphonous green algae. Hypertonic stress, due to increased external osmotic pressure, is accompanied by positive-going potential difference (PD), increase in conductance, and slow turgor regulation. The relationship between these is not yet resolved, but may involve changes in K(+ )conductance (G (K)) or active K(+) transport at both membranes. Hypotonic turgor regulation, in response to decreased external osmotic pressure, is approximately 3 times faster than hypertonic turgor regulation. It is accompanied by a negative-going PD, although conductance also increases. The conductance increase and the magnitude of the PD change are strongly correlated with the magnitude of hypotonic stress.
Authors:
M A Bisson; M J Beilby; V A Shepherd
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Review     Date:  2006-08-14
Journal Detail:
Title:  The Journal of membrane biology     Volume:  211     ISSN:  0022-2631     ISO Abbreviation:  J. Membr. Biol.     Publication Date:  2006 May 
Date Detail:
Created Date:  2006-09-28     Completed Date:  2006-12-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0211301     Medline TA:  J Membr Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1-14     Citation Subset:  IM    
Affiliation:
Department of Biological Sciences, Cooke Hall 109, University at Buffalo, Buffalo, NY 14260, USA. bisson@buffalo.edu
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MeSH Terms
Descriptor/Qualifier:
Algae / physiology*
Chara / physiology
Electrophysiology*
Osmotic Pressure

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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