Adenylate-coupled ion movement. A mechanism for the control of nodule permeability to O2 diffusion

Plant Physiology
Hui Wei, D. B. Layzell

Abstract

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...Continue Reading

References

Apr 25, 2000·Journal of Theoretical Biology·P P ThumfortC A Atkins
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Aug 1, 1996·Plant Physiology·D. P. Briskin, M. C. Gawienowski
Jan 1, 1994·Plant Physiology·I. J. Oresnik, D. B. Layzell
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Apr 3, 2003·Proceedings of the National Academy of Sciences of the United States of America·Eric HosyHervé Sentenac
Jan 24, 2004·Plant Physiology·Hui WeiDavid B Layzell
Jan 1, 1985·Journal of Plant Physiology·W Dieter JeschkeJ S Pate

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Citations

Jan 19, 2016·Frontiers in Plant Science·Ulrike AvenhausJoachim Schulze
Apr 11, 2009·Journal of Theoretical Biology·Diana E MarcoJuan Sanjuán
Feb 3, 2015·The Plant Journal : for Cell and Molecular Biology·Ricardo A CabezaJoachim Schulze
Sep 25, 2012·FEMS Microbiology Reviews·Andreas F HaagGail P Ferguson
Oct 15, 2009·Molecular Plant·Christine ChangPierre Frendo

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