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    Hydrogel Control of Xylem Hydraulic Resistance in Plants  
    Maciej A. Zwieniecki(Harvard University)
    USA | Science
    2001.02.09 | 바로가기
    flow rate, hydraulic resistance in plants
    Cited by 572

    ■  View full text
    Science  09 Feb 2001: Vol. 291, Issue 5506, pp. 1059-1062
    https://science.sciencemag.org/content/291/5506/1059.abstract
     


    ■  Researchers
    Maciej A. Zwieniecki*, Peter J. Melcher, N. Michele Holbrook
    Organismic and Evolutionary Biology, Harvard University, 16 Divinity Avenue, Cambridge, MA 02138, USA.

     

     

    ■  Abstract
    Increasing concentrations of ions flowing through the xylem of plants produce rapid, substantial, and reversible decreases in hydraulic resistance. Changes in hydraulic resistance in response to solution ion concentration, pH, and nonpolar solvents are consistent with this process being mediated by hydrogels. The effect is localized to intervessel bordered pits, suggesting that microchannels in the pit membranes are altered by the swelling and deswelling of pectins, which are known hydrogels. The existence of an ion-mediated response breaks the long-held paradigm of the xylem as a system of inert pipes and suggests a mechanism by which plants may regulate their internal flow regime.
     

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