Effect of Water Stress and Mercuric Chloride on the Translational Diffusion of Water in Maize Seedling Roots

Effect of Water Stress and Mercuric Chloride on the Translational Diffusion of Water in Maize... Water diffusion in maize roots (Zea mays L., cv. Donskaya 1) was investigated with a pulsed gradient NMR using mercuric chloride as an inhibitor of water channels in cell membranes. A novel operation program was applied that allowed selective evaluation of fractional amounts of water transported through various pathways—the apoplastic, symplasmic, and transmembrane routes. The blockage of water channels with HgCl2 reduced the rates of water diffusion by a factor of 1.5–2. This effect was reversible and was removed by the addition of β-mercaptoethanol. The coefficient of water diffusion changed with time elapsed after the HgCl2 treatment. The effect of water stress on the rates of water diffusion was similar to that of HgCl2. Remarkably, the water-stressed roots of maize seedlings were insensitive to the inhibitor of water channels. The results are interpreted in terms of redistribution of water flows among various routes in plant tissues. Water stress and mercuric chloride treatments decelerate the transmembrane water transport and promote water flow along the apoplastic pathway. These responses might arise from the reversible regulation of water movement along various transport pathways. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Effect of Water Stress and Mercuric Chloride on the Translational Diffusion of Water in Maize Seedling Roots

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Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2003 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/A:1021992603031
Publisher site
See Article on Publisher Site

Abstract

Water diffusion in maize roots (Zea mays L., cv. Donskaya 1) was investigated with a pulsed gradient NMR using mercuric chloride as an inhibitor of water channels in cell membranes. A novel operation program was applied that allowed selective evaluation of fractional amounts of water transported through various pathways—the apoplastic, symplasmic, and transmembrane routes. The blockage of water channels with HgCl2 reduced the rates of water diffusion by a factor of 1.5–2. This effect was reversible and was removed by the addition of β-mercaptoethanol. The coefficient of water diffusion changed with time elapsed after the HgCl2 treatment. The effect of water stress on the rates of water diffusion was similar to that of HgCl2. Remarkably, the water-stressed roots of maize seedlings were insensitive to the inhibitor of water channels. The results are interpreted in terms of redistribution of water flows among various routes in plant tissues. Water stress and mercuric chloride treatments decelerate the transmembrane water transport and promote water flow along the apoplastic pathway. These responses might arise from the reversible regulation of water movement along various transport pathways.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 17, 2004

References

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