Journal
SCIENCE
Volume 291, Issue 5506, Pages 1059-1062Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1057175
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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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