Measurements of Leaf Specific Conductivity (LSC) of the vertical water potential gradients and of vessels diameters in 1-year-old twigs of young olive trees have been made. LSC prooves to vary along the twigs differently from other species we have already studied in that it is significantly lower in the proximal twig's segment. Consequently, the water potential gradients are in this region higher so indicating that a higher resistance to flow exists. The frequency distribution of the vessels diameters shows that changes in the xylem hydraulic conductivity are mainly due to analogous changes in the relative number of large-diameter vessels. Also the nodes appear to behave as constriction zones of the xylem system. The functional significance of such constrictions in terms of a safety system against cavitation is discussed.

Water transport pathways in nodes and internodes of 1-year-old twigs of Olea europaea L

S. Salleo;M. A. Lo Gullo
1983-01-01

Abstract

Measurements of Leaf Specific Conductivity (LSC) of the vertical water potential gradients and of vessels diameters in 1-year-old twigs of young olive trees have been made. LSC prooves to vary along the twigs differently from other species we have already studied in that it is significantly lower in the proximal twig's segment. Consequently, the water potential gradients are in this region higher so indicating that a higher resistance to flow exists. The frequency distribution of the vessels diameters shows that changes in the xylem hydraulic conductivity are mainly due to analogous changes in the relative number of large-diameter vessels. Also the nodes appear to behave as constriction zones of the xylem system. The functional significance of such constrictions in terms of a safety system against cavitation is discussed.
1983
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/3128800
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