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    Water relations in cotton plants infected with Phymatotrichum omnivorum

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    Author
    Olsen, Mary Ward.
    Issue Date
    1982
    Keywords
    Hydrology.
    Cotton -- Diseases and pests -- Arizona.
    Cotton root rot.
    Committee Chair
    Misaghi, Iraj
    
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    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Water relations in cotton plants infected with Phymatotrichum omnivorum were studied to determine the mechanism of wilt development. Relationships between leaf water and osmotic potentials, relative water contents, and diffusive resistances of leaves from diseased and waterstressed healthy plants were similar, indicating that wilting was not due to changes in leaf osmotic regulation. Rates of recovery from wilting, measured as increases in relative water content with time in both diseased and waterstressed healthy plants were identical. There was no significant difference in root dry weight of healthy and diseased plants, indicating that wilting is not a consequence of reduced root area. Resistance to water flow in roots and lower stems increased significantly over those of healthy plants as upper leaves of diseased plants began to wilt. However, resistance to water flow in petioles of diseased plants was unchanged. These results show that wilting in cotton plants is probably the consequence of increased resistance to water flow in roots. Results of a preliminary study indicate that a high-molecular-weight substance produced by the fungus in culture may cause blockage of xylem elements in roots and lower stems and contribute to the increased resistance to water flow.
    Type
    Dissertation-Reproduction (electronic)
    text
    Degree Name
    Ph. D.
    Degree Level
    doctoral
    Degree Program
    Plant Pathology
    Graduate College
    Degree Grantor
    University of Arizona
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