Document Detail

Impact of apoplast volume on ionic relations in plant cells.
MedLine Citation:
PMID:  11687879     Owner:  NLM     Status:  MEDLINE    
Ionic relations of plant cells with free-running transmembrane voltage, V, can be modelled by electrocoupling of known, V-relevant and V-gated transporters. For cells in vitro, with constant external substrate concentrations, alternating states of solute uptake and release can be predicted. Here the model is extended to treat cells with limited external substrates, e.g., parenchyma cells in situ with a small external space, the apoplast. This model accounts also for cytoplasmic H+ buffering and apoplastic buffering of H+, K+ and Ca2+ by fixed anions. In general, the model converges to thermodynamic equilibrium for K+ between apoplast and symplast, and to equal steady-state rates of uptake and release for Cl- and H+. Oscillations of this model are rare and very sensitive to the volume portion of the apoplast.
D Gradmann
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of membrane biology     Volume:  184     ISSN:  0022-2631     ISO Abbreviation:  J. Membr. Biol.     Publication Date:  2001 Nov 
Date Detail:
Created Date:  2001-11-05     Completed Date:  2002-02-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0211301     Medline TA:  J Membr Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  61-9     Citation Subset:  IM    
Abteilung Biophysik der Pflanze, Universität Göttingen, Untere Karspüle 2, 37073 Göttingen, Germany.
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MeSH Terms
Biological Transport, Active / physiology
Cell Size / physiology*
Ion Transport / physiology
Membrane Potentials / physiology*
Plants / cytology*,  metabolism*
Erratum In:
J Membr Biol 2002 Apr 1;186(3):185

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