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Evidence for Hydraulic Vulnerability Segmentation and Lack of Xylem Refilling under Tension

hal.structure.identifierEcophysiologie et Génomique Fonctionnelle de la Vigne [UMR EGFV]
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorCHARRIER, Guillaume
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorTORRES-RUIZ, José
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
dc.contributor.authorBADEL, Eric
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorBURLETT, Régis
hal.structure.identifierHawkesbury Institute for the Environment [Richmond] [HIE]
dc.contributor.authorCHOAT, Brendan
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
dc.contributor.authorCOCHARD, Hervé
hal.structure.identifierSanté et agroécologie du vignoble [UMR SAVE]
dc.contributor.authorDELMAS, Chloe
hal.structure.identifierNicholas School of the Environment
hal.structure.identifierDuke University [Durham]
dc.contributor.authorDOMEC, Jean-Christophe
hal.structure.identifierUniversität Ulm - Ulm University [Ulm, Allemagne]
dc.contributor.authorJANSEN, Steven
hal.structure.identifierSynchrotron SOLEIL [SSOLEIL]
dc.contributor.authorKING, Andrew
hal.structure.identifierPlateforme Aquitaine de Caractérisation des Matériaux [PLACAMAT]
dc.contributor.authorLENOIR, Nicolas
hal.structure.identifierEcologie des Forêts Méditerranéennes [URFM]
dc.contributor.authorMARTIN-STPAUL, Nicolas
hal.structure.identifierEcophysiologie et Génomique Fonctionnelle de la Vigne [UMR EGFV]
dc.contributor.authorGAMBETTA, Gregory Alan
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
dc.date.issued2016-11-09
dc.identifier.issn0032-0889
dc.description.abstractEnThe vascular system of grapevine (Vitis spp.) has been reported as being highly vulnerable, even though grapevine regularly experiences seasonal drought. Consequently, stomata would remain open below water potentials that would generate a high loss of stem hydraulic conductivity via xylem embolism. This situation would necessitate daily cycles of embolism repair to restore hydraulic function. However, a more parsimonious explanation is that some hydraulic techniques are prone to artifacts in species with long vessels, leading to the overestimation of vulnerability. The aim of this study was to provide an unbiased assessment of (1) the vulnerability to drought-induced embolism in perennial and annual organs and (2) the ability to refill embolized vessels in two Vitis species X-ray micro-computed tomography observations of intact plants indicated that both Vitis vinifera and Vitis riparia were relatively vulnerable, with the pressure inducing 50% loss of stem hydraulic conductivity = -1.7 and -1.3 MPa, respectively. In V. vinifera, both the stemand petiole had similar sigmoidal vulnerability curves but differed in pressure inducing 50% loss of hydraulic conductivity (-1.7 and -1MPa for stem and petiole, respectively). Refilling was not observed as long as bulk xylem pressure remained negative (e. g. at the apical part of the plants; -0.11 +/- 0.02 MPa) and change in percentage loss of conductivity was 0.02% +/- 0.01%. However, positive xylem pressure was observed at the basal part of the plant (0.04 +/- 0.01 MPa), leading to a recovery of conductance (change in percentage loss of conductivity = -0.-4% +/- 0.12%). Our findings provide evidence that grapevine is unable to repair embolized xylem vessels under negative pressure, but its hydraulic vulnerability segmentation provides significant protection of the perennial stem.
dc.description.sponsorshipPlateforme d'Innovation " Forêt-Bois-Fibre-Biomasse du Futur "
dc.description.sponsorshipCOntinental To coastal Ecosystems: evolution, adaptability and governance - ANR-10-LABX-0045
dc.language.isoen
dc.publisherOxford University Press ; American Society of Plant Biologists
dc.title.enEvidence for Hydraulic Vulnerability Segmentation and Lack of Xylem Refilling under Tension
dc.typeArticle de revue
dc.identifier.doi10.1104/pp.16.01079
dc.subject.halSciences de l'environnement
dc.description.sponsorshipEuropeRSFQ control of Josephson Junction Qubits
bordeaux.journalPlant Physiology
bordeaux.page1657-1668
bordeaux.volume172
bordeaux.issue3
bordeaux.peerReviewedoui
hal.identifierhal-04873315
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04873315v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Plant%20Physiology&rft.date=2016-11-09&rft.volume=172&rft.issue=3&rft.spage=1657-1668&rft.epage=1657-1668&rft.eissn=0032-0889&rft.issn=0032-0889&rft.au=CHARRIER,%20Guillaume&TORRES-RUIZ,%20Jos%C3%A9&BADEL,%20Eric&BURLETT,%20R%C3%A9gis&CHOAT,%20Brendan&rft.genre=article


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