Hydrogel Control of Xylem Hydraulic Resistance in Plants
Top Cited Papers
- 9 February 2001
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 291 (5506) , 1059-1062
- https://doi.org/10.1126/science.1057175
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.Keywords
This publication has 20 references indexed in Scilit:
- Dynamic changes in petiole specific conductivity in red maple (Acer rubrum L.), tulip tree (Liriodendron tulipifera L.) and northern fox grape (Vitis labrusca L.)Plant, Cell & Environment, 2000
- Fluid ionic composition influences hydraulic conductance of xylem conduitsJournal of Experimental Botany, 2000
- Diurnal variation in xylem hydraulic conductivity in white ash (Fraxinus americana L.), red maple (Acer rubrum L.) and red spruce (Picea rubens Sarg.)Plant, Cell & Environment, 1998
- Regulatory mechanisms of ion channels in xylem parenchyma cellsJournal of Experimental Botany, 1997
- Chemistry and uses of pectin — A reviewCritical Reviews in Food Science and Nutrition, 1997
- Negative Xylem Pressures in Plants: A Test of the Balancing Pressure TechniqueScience, 1995
- The concentration of xylem sap constituents in root exudate, and in sap from intact, transpiring castor bean plants (Ricinus communis L.)Plant, Cell & Environment, 1995
- Stomatal and hydraulic conductance in growing sugarcane: stomatal adjustment to water transport capacity*Plant, Cell & Environment, 1990
- Vulnerability of Xylem to Cavitation and EmbolismAnnual Review of Plant Biology, 1989
- GelsScientific American, 1981