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Drought-induced leaf shedding in walnut: evidence for vulnerability segmentation |
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| Authors: | M T TYREE H COCHARD P CRUIZIAT B SINCLAIR T AMEGLIO |
| Institution: | U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station, PO Box 968, Burlington, Vermont 05402, USA;INRA, Laboratoire d'Ecophysiologie Forestiere, 54280 Champenoux, France;INRA, Laboratoire de Phviologie Integree de l'Arbre Fruitier, 63039 Clermont-Ferrand, France;Smithsonian Tropical Research Institute, Unit 0948, APO AA 34002–0948 |
| Abstract: | Trees of Juglans regia L. shed leaves when subjected to drought. Before shedding (when leaves are yellow), the petioles have lost 87% of their maximum hydraulic conductivity, but stems have lost only 14% of their conductivity. This is caused by the higher vulnerability of petioles than stems to water-stress induced cavitation. These data are discussed in the context of the plant segmentation hypothesis. |
| Keywords: | Juglans regia walnut leaf shedding drought plant segmentation |