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New Insights into the Mechanisms of Water-Stress-Induced Cavitation in Conifers

hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
dc.contributor.authorCOCHARD, Hervé
hal.structure.identifierForest Ecology and Management [Helsinki]
dc.contributor.authorHOLTTA, Teemu
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
dc.contributor.authorHERBETTE, Stéphane
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
hal.structure.identifierSchool of Geosciences [Edinburgh]
dc.contributor.authorMENCUCCINI, Maurizio
dc.date.issued2009
dc.identifier.issn0032-0889
dc.description.abstractEnCavitation resistance is a key parameter to understand tree drought tolerance but little is known about the mechanisms of air entry into xylem conduits. For conifers three mechanisms have been proposed: (1) a rupture of pit margo microfibrils, (2) a displacement of the pit torus from its normal sealing position over the pit aperture, and (3) a rupture of an air-water menisci in a pore of the pit margo. In this article, we report experimental results on three coniferous species suggesting additional mechanisms. First, when xylem segments were injected with a fluid at a pressure sufficient to aspirate pit tori and well above the pressure for cavitation induction we failed to detect the increase in sample conductance that should have been caused by torus displacement from blocking the pit aperture or by membrane rupture. Second, by injecting xylem samples with different surfactant solutions, we found a linear relation between sample vulnerability to cavitation and fluid surface tension. This suggests that cavitation in conifers could also be provoked by the capillary failure of an air-water meniscus in coherence with the prediction of Young-Laplace's equation. Within the bordered pit membrane, the exact position of this capillary seeding is unknown. The possible Achilles' heel could be the seal between tori and pit walls or holes in the torus. The mechanism of water-stress-induced cavitation in conifers could then be relatively similar to the one currently proposed for angiosperms.
dc.language.isoen
dc.publisherOxford University Press ; American Society of Plant Biologists
dc.subject.enCAVITATION
dc.subject.enWATER STRESS 
dc.title.enNew Insights into the Mechanisms of Water-Stress-Induced Cavitation in Conifers
dc.typeArticle de revue
dc.identifier.doi10.1104/pp.109.138305
dc.subject.halSciences du Vivant [q-bio]/Génétique/Génétique des plantes
bordeaux.journalPlant Physiology
bordeaux.page949-954
bordeaux.volume151
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-01189369
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01189369v1
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