Document Detail

A plasmamembrane redox system and proton transport in isolated mesophyll cells.
MedLine Citation:
PMID:  16665359     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Potassium ferricyanide (K(3)Fe[CN](6)) was added to aerated and stirred nonbuffered suspensions of mechanically isolated photosynthetically competent Asparagus sprengeri Regel mesophyll cells. Rates of Fe(CN)(6) (3-) reduction and H(+) efflux were measured with or without illumination. On the addition of 1 millimolar Fe(CN)(6) (3-) to nonilluminated cell suspensions acidification of the medium indicated an H(+) efflux of 1.54 nanomoles H(+)/10(6) cells per minute. Simultaneous Fe(CN)(6) (3-) reduction occurred at a rate of 1.55 nanomoles Fe(CN)(6) (3-)/10(6) cells per minute. Illumination stimulated these rates 14 to 17 times and corresponding values were 26.1 nanomoles H(+)/10(6) cells per minute and 22.9 nanomoles Fe(CN)(6) (3-)/10(6) cells per minute. These two processes appeared to be tightly coupled and were rapidly inhibited when illuminated suspensions were transferred to darkness or treated with 1 micromolar 3-(3,4-dichlorophenyl)-1,1 dimethylurea. Addition of 0.1 millimolar diethylstilbestrol eliminated ATP dependent H(+) efflux in illuminated or nonilluminated cells but had no influence on Fe(CN)(6) (3-) dependent H(+) efflux. Recent reports indicate that a transmembrane redox system spans the plasma membrane of root cells and is coupled to the efflux of H(+). The present report extends these observations to photosynthetically competent mesophyll cells. The results indicate a transport process independent of ATP driven H(+) efflux which operates with a H(+)/e(-) stoichiometry of one.
E Neufeld; A W Bown
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Plant physiology     Volume:  83     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1987 Apr 
Date Detail:
Created Date:  2010-06-29     Completed Date:  2010-06-29     Revised Date:  2010-09-14    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  895-9     Citation Subset:  -    
Department of Biological Sciences, Brock University, St. Catharines, Ontario L2S 3A1.
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