Sensitivity of stem and petiole hydraulic conductance of deciduous trees to xylem sap ion concentration |
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Authors: | K Aasamaa A Sõber |
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Institution: | (1) Department of Silviculture, Estonian Agricultural University, Kreutzwaldi 5, 51014 Tartu , Estonia;(2) Institute of Botany and Ecology, University of Tartu, Lai 40, 51005 Tartu , Estonia;(3) Lehrstuhl Botanik , Julius von Sachs Institut für Biowissenschaften der Universität Würzburg, Julius von Sachs Platz 2, 97082 Würzburg, Germany;(4) Department of Plant Physiology, Institute of Molecular and Cell Biology, University of Tartu, Riia 23, 51010 Tartu , Estonia |
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Abstract: | Hydraulic conductance of stem and petioles increased in response to an increase in xylem sap ion concentration, and decreased
in response to a decrease in the ion concentration in six temperate deciduous tree species. The ion sensitivity of hydraulic
conductance of stem and petioles was higher than the ion sensitivity of the stem alone. The ion sensitivity was lowest in
the earliest developmental stages of the xylem, and had a seasonal maximum in the second half of summer. The ion sensitivity
was highest in slow-growing species and lowest in fast-growing species. The ion sensitivity correlated negatively with mean
radius of xylem conduits, hydraulic conductance of stem and petioles, hydraulic conductance of leaf laminae, and stomatal
conductance, and positively with response of the hydraulic conductance of leaf laminae to HgCl2, and stomatal response to a decrease in leaf water potential or abscisic acid. It was concluded that the high ion sensitivity
of xylem hydraulic conductance is a relevant characteristic of slow growth and a conservative water use strategy. |
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