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Evidence for hydraulic vulnerability segmentation and lack of xylem refilling under tension

dc.rights.licenseopenen_US
hal.structure.identifierEcophysiologie et Génomique Fonctionnelle de la Vigne [UMR EGFV]
dc.contributor.authorCHARRIER, Guillaume
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorTORRES RUIZ, Jose Manuel
dc.contributor.authorBADEL, Eric
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorBURLETT, Régis
dc.contributor.authorCHOAT, Brendan
hal.structure.identifierSanté et agroécologie du vignoble [UMR SAVE]
dc.contributor.authorDELMAS, Chloé E. L.
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorDOMEC, Jean-Christophe
ORCID: 0000-0003-0478-2559
IDREF: 195495667
dc.contributor.authorJANSEN, Steven
dc.contributor.authorKING, Andrew
dc.contributor.authorLENOIR, Nicolas
dc.contributor.authorMARTIN, Nicolas
hal.structure.identifierEcophysiologie et Génomique Fonctionnelle de la Vigne [UMR EGFV]
dc.contributor.authorGAMBETTA, Gregory
ORCID: 0000-0002-8838-5050
IDREF: 225449641
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
dc.date.accessioned2020-03-29T14:14:12Z
dc.date.available2020-03-29T14:14:12Z
dc.date.issued2016
dc.identifier.issn0032-0889en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/4024
dc.description.abstractEnThe vascular system of grapevine has been reported as being highly vulnerable, even though grapevine regularly experiences seasonal drought. Stomata would consequently 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 overestimation of vulnerability. The aim of this study was to provide an unbiased assessment of (i) the vulnerability to drought-induced embolism in perennial and annual organs, and (ii) the ability to refill embolized vessels in two Vitis species. X-ray micro-CT observations on intact plants indicated that both V. vinifera and V. riparia were relatively vulnerable, with the pressure inducing 50% loss of stem hydraulic conductivity (Ψ50Stem) = -1.7 and -1.3MPa, respectively. In V. vinifera, both the stem and petiole had similar sigmoidal vulnerability curves, but differed in Ψ50 (-1.7 and -1.0MPa 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): P=-0.11{plus minus}0.02MPa; ∆PLC=0.02{plus minus}0.01%). However, positive xylem pressure was observed at the basal part of the plant (P=0.04{plus minus}0.01MPa), leading to recovered conductance (∆PLC=-0.24{plus minus}0.12%). Our findings provide evidence that grapevine is unable to repair embolized xylem vessels under negative pressure, but its hydraulic vulnerability segmentation provides a significant protection of the perennial stem.
dc.language.isoENen_US
dc.subjectConductivité hydraulique
dc.subjectTransport xylème
dc.subjectEmbolie
dc.subjectVigne
dc.subjectVitis Vinifera
dc.title.enEvidence for hydraulic vulnerability segmentation and lack of xylem refilling under tension
dc.typeArticle de revueen_US
dc.identifier.doi10.1104/pp.16.01079
dc.subject.halSciences du Vivant [q-bio]/Biologie végétaleen_US
bordeaux.journalPlant Physiologyen_US
bordeaux.page1657-1668en_US
bordeaux.volume172en_US
bordeaux.hal.laboratoriesEcophysiologie et Génomique Fonctionnelle de la Vigne (EGFV) - UMR 1287en_US
bordeaux.issue3en_US
bordeaux.institutionBordeaux Sciences Agroen_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionINRAE
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
hal.identifierhal-03170616
hal.version1
hal.date.transferred2021-03-16T11:22:53Z
hal.exporttrue
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