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Dynamic of cavitation, embolism and water fluxes in trees during freeze-thaw cycle analysed by in vivo visualization

dc.rights.licenseopenen_US
dc.contributor.authorCHARRA-VASKOU, Katline
hal.structure.identifierEcophysiologie et Génomique Fonctionnelle de la Vigne [UMR EGFV]
dc.contributor.authorCHARRIER, Guillaume
dc.contributor.authorBADEL, Eric
dc.contributor.authorPONOMARENKO, Alexandre
dc.contributor.authorBONHOMME, Marc
dc.contributor.authorMAYR, Stefan
dc.contributor.authorAMEGLIO, Thierry
dc.date.accessioned2020-03-22T21:04:19Z
dc.date.available2020-03-22T21:04:19Z
dc.date.issued2015
dc.date.conference2015-09-07
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/3927
dc.description.abstractEnFreeze-thaw cycles are inducing major hydraulic changes due to liquid to ice transition within tree stems. The very low water potential at the ice-liquid interface is crucial as it may cause irreversible water fluxes and cavitation in xylem sap conduits, which impacts whole tree water relations. We therefore investigated water fluxes induced by ice formation during freeze-thaw cycles in angiosperm tree stems using four complementary approaches: Microdendrometer, Magnetic Resonance Imaging (MRI), X-ray microtomography and Ultrasonic acoustic Emissions (UEs) analysis. When temperature dropped, ice nucleation occurred likely in cambial area inducing water redistribution within the stem toward the ice front. Dehydration of bark living cells leading to drastic shrinkage of this tissue was observed, as well as high tension within wood reaching the cavitation threshold in sap vessels (Charrier et al., 2014). UEs, strictly emitted during freezing, indicated cavitation events (i.e. bubbles formation) in the xylem sap (Ponomarenko et al., 2014). However, xylem embolism formation (i.e. bubbles expansion) was observed only on thawing via X-ray microtomography. The observations indicated drastic dehydration of bark cells and cavitation events in conduits during freezing, whereas embolism occurred during thawing. UEs were detected during freezing and not directly related to embolism formation. These results enabled new insights into the complex process and the dynamics of water movements and ice formation during freeze thaw cycle in branches of trees.
dc.language.isoENen_US
dc.publisherINRA - Université de Bordeaux, Bordeaux(FRA)en_US
dc.subject.enAcoustic Emissions
dc.subject.enBark Shrinkage
dc.subject.enX-Ray Microtomography
dc.subject.enMicrodendrometer
dc.subject.enWinger Biology
dc.title.enDynamic of cavitation, embolism and water fluxes in trees during freeze-thaw cycle analysed by in vivo visualization
dc.typeCommunication dans un congrès avec actesen_US
dc.subject.halSciences du Vivant [q-bio]/Biologie végétaleen_US
bordeaux.pageT19en_US
bordeaux.hal.laboratoriesEcophysiologie et Génomique Fonctionnelle de la Vigne (EGFV) - UMR 1287en_US
bordeaux.institutionBordeaux Sciences Agroen_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.conference.titleXylem International Meeting, Rencontres, INRA et Université de Bordeauxen_US
bordeaux.countryfren_US
bordeaux.title.proceedingXylem International Meetingen_US
bordeaux.conference.cityBordeauxen_US
bordeaux.peerReviewedouien_US
hal.identifierhal-02514753
hal.version1
hal.date.transferred2020-03-22T21:04:21Z
hal.exporttrue
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