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Low proton conductance of plant cuticles and its relevance to the Acid-growth theory.
MedLine Citation:
PMID:  16661976     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Evidence obtained on the relation between the pH of the medium and the growth of intact stem sections is compatible with the acid-growth theory only if the proton conductance of the cuticle is so low that the cuticle is an effective barrier to the entry or exit of protons from the tissue. By measuring the rate at which protons cross frozen-thawed epidermal strips of sunflower (Helianthus annuus L.) and soybean hypocotyls (Glycine max Morr.) and enzymically isolated cuticles of Berberis aquifolium Persh. and tomato (Lycopersicum esculentum Mill.) fruit, we have now demonstrated the low proton conductance of the cuticular layer. Unless the conductance is enhanced by abrasion of the cuticle or by removal of the cuticular waxes, proton movement into and out of a tissue across the cuticle will be significant only over long time periods.
Authors:
S A Dreyer; V Seymour; R E Cleland
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Plant physiology     Volume:  68     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1981 Sep 
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:  664-7     Citation Subset:  -    
Affiliation:
Department of Botany, University of Washington, Seattle, Washington 98195.
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