biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 45:227-234, 2002 | DOI: 10.1023/A:1015192522354

Changes in Stem and Leaf Hydraulics Preceding Leaf Shedding in Castanea Sativa L.

S. Salleo1, A. Nardini1, M.A. Lo Gullo2, L.A. Ghirardelli1
1 Dipartimento di Biologia, Università di Trieste, Trieste, Italia
2 Dipartimento di Scienze Botaniche, Università di Messina, Messina S. Agata, Italia

This paper describes changes in leaf water status and in stem, petiole and leaf blade hydraulics preceding leaf senescence and shedding in Castanea sativa L. (chestnut). Measurements of maximum diurnal leaf conductance to water vapour (gL), minimum water potential (ψL), hydraulic conductance per unit leaf surface area of stems (KSL), petioles (KPL) and leaf blades (KLL) and number of functional conduits and inside diameter distribution were performed in June, September and October 1999. In September, still green leaves had undergone some dehydration as indicated by decreased gL (by 75 %) and ψL with respect to June. In the same time, KSL decreased by 88 %, while KPL and KLL decreased by 50 % and 20 % of the conduits of stems and 10 % of the petioles (all belonging to the widest diameter range) were no longer functioning, causing a decrease in the theoretical flow by 82 % in stems and 27 % in petioles. Stem xylem blockage was apparently due to tyloses growing into conduits. We advance the hypothesis that the entire process of leaf shedding and winter rest may be initiated by extensive stem embolism occurring during the summer.

Keywords: chestnut; xylem embolism; hydraulic conductance; leaf water status; HPFM
Subjects: Castanea sativa; chestnut, leaf water status; hydraulic conductance; senescence, stem and leaf hydraulics, leaf water status; xylem embolism

Published: June 1, 2002  Show citation

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Salleo, S., Nardini, A., Lo Gullo, M.A., & Ghirardelli, L.A. (2002). Changes in Stem and Leaf Hydraulics Preceding Leaf Shedding in Castanea Sativa L. Biologia plantarum, 45(2), 227-234. doi: 10.1023/A:1015192522354
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