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Water Relations of Cotton Plants under Nitrogen DeficiencyI. Dependence upon Leaf Structure

Water Relations of Cotton Plants under Nitrogen DeficiencyI. Dependence upon Leaf Structure Abstract Cotton plants (Gossypium hirsutum L.) grown on deficient levels of N exhibited many of the characteristics associated with drought resistance. In N-deficient plants, leaf areas and leaf epidermal cells were smaller than at the same nodes in high-N plants. N-deficient leaves lost only about half as much water per unit change in water potential as did high-N leaves. In addition, they maintained a greater relative water content than high-N leaves at any given potential. Osmotic potentials (determined from pressure-volume curves) were slightly lower in N-deficient leaves. This difference in solute concentration was not from organic acids, which were almost unchanged. Sugar concentrations could account for only about 25% of the difference. Leaves of N-deficient plants contained considerably more dry matter per unit moisture. Most of this difference in dry weight was in the crude cell wall fraction. The pressure-volume curves and other indirect evidence strongly suggested that cell walls of N-deficient leaves were substantially more rigid than cell walls of high-N leaves. The effects of N deficiency on cell wall properties mimic the changes which occur during drought adaptation. This content is only available as a PDF. © 1979 American Society of Plant Biologists This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Physiology Oxford University Press

Water Relations of Cotton Plants under Nitrogen DeficiencyI. Dependence upon Leaf Structure

Radin, John W.; Parker, Linda L.
Plant Physiology , Volume 64 (3) – Sep 1, 1979
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Publisher
Oxford University Press
Copyright
Copyright © 2021 American Society of Plant Biologists
ISSN
0032-0889
eISSN
1532-2548
DOI
10.1104/pp.64.3.495
Publisher site
See Article on Publisher Site

Abstract

Abstract Cotton plants (Gossypium hirsutum L.) grown on deficient levels of N exhibited many of the characteristics associated with drought resistance. In N-deficient plants, leaf areas and leaf epidermal cells were smaller than at the same nodes in high-N plants. N-deficient leaves lost only about half as much water per unit change in water potential as did high-N leaves. In addition, they maintained a greater relative water content than high-N leaves at any given potential. Osmotic potentials (determined from pressure-volume curves) were slightly lower in N-deficient leaves. This difference in solute concentration was not from organic acids, which were almost unchanged. Sugar concentrations could account for only about 25% of the difference. Leaves of N-deficient plants contained considerably more dry matter per unit moisture. Most of this difference in dry weight was in the crude cell wall fraction. The pressure-volume curves and other indirect evidence strongly suggested that cell walls of N-deficient leaves were substantially more rigid than cell walls of high-N leaves. The effects of N deficiency on cell wall properties mimic the changes which occur during drought adaptation. This content is only available as a PDF. © 1979 American Society of Plant Biologists This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)

Journal

Plant Physiology – Oxford University Press

Published: Sep 1, 1979

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