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Published on March 10, 2006; 10.1104/pp.106.077552

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Received January 22, 2006
Returned for revision February 20, 2006
Accepted February 20, 2006

Adenylate-coupled ion movement: a mechanism for the control of nodule permeability to O2 diffusion

Hui Wei and David B. Layzell *

Department of Biology, Queen's University, Kingston, Ontario, Canada K7L 3N6

* Corresponding author; email: layzelld{at}biology.queensu.ca.

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 which 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 central zone tissue whereas the 10% O2 treatment, known to increased 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.




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