Document Detail


Adenylate-coupled ion movement. A mechanism for the control of nodule permeability to O2 diffusion.
MedLine Citation:
PMID:  16531483     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In response to changes in phloem supply, adenylate demand, and oxygen status, legume nodules are known to exercise rapid (seconds to hours) physiological control over their permeability to oxygen diffusion. Diffusion models have attributed this permeability control to the reversible flow of water into or out of intercellular spaces. To test hypotheses on the mechanism of diffusion barrier control, nodulated soybean (Glycine max L. Merr.) plants were exposed to a range of treatments known to alter nodule O2 permeability (i.e. 10% O2, 30% O2, Ar:O2 exposure, and stem girdling) before the nodules were rapidly frozen, freeze dried, and dissected into cortex and central zone (CZ) fractions that were assayed for K, Mg, and Ca ion concentrations. Treatments known to decrease nodule permeability (30% O2, Ar:O2 exposure, and stem girdling) were consistently associated with an increase in the ratio of [K+] in cortex to [K+] in the CZ tissue, whereas the 10% O2 treatment, known to increase nodule permeability, was associated with a decrease in the [K+]cortex:[K+](CZ). When these findings were considered in the light of previous results, a proposed mechanism was developed for the adenylate-coupled movement of ions and water into and out of infected cells as a possible mechanism for diffusion barrier control in legume nodules.
Authors:
Hui Wei; David B Layzell
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-03-10
Journal Detail:
Title:  Plant physiology     Volume:  141     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  2006 May 
Date Detail:
Created Date:  2006-05-10     Completed Date:  2006-07-31     Revised Date:  2010-09-15    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  280-7     Citation Subset:  IM    
Affiliation:
Department of Biology, Queen's University, Kingston, Ontario, K7L 3N6, Canada.
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MeSH Terms
Descriptor/Qualifier:
Adenine Nucleotides / physiology*
Adenosine Diphosphate / physiology
Adenosine Monophosphate / physiology
Adenosine Triphosphate / physiology
Argon / pharmacology
Calcium / metabolism
Diffusion
Hydrogen / metabolism
Ion Transport
Magnesium / metabolism
Models, Biological
Nitrogenase / metabolism
Oxygen / metabolism*
Plant Roots / anatomy & histology,  metabolism
Potassium / metabolism
Soybeans / anatomy & histology,  metabolism*
Chemical
Reg. No./Substance:
0/Adenine Nucleotides; 1333-74-0/Hydrogen; 56-65-5/Adenosine Triphosphate; 58-64-0/Adenosine Diphosphate; 61-19-8/Adenosine Monophosphate; 7439-95-4/Magnesium; 7440-09-7/Potassium; 7440-37-1/Argon; 7440-70-2/Calcium; 7782-44-7/Oxygen; EC 1.18.6.1/Nitrogenase
Comments/Corrections

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


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