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Lack of vulnerability segmentation in four angiosperm tree species: evidence from direct X-ray microtomography observation

hal.structure.identifierHawkesbury Institute for the Environment [Richmond] [HIE]
dc.contributor.authorLI, Ximeng
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
dc.contributor.authorTORRES RUIZ, Jose Manuel
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
dc.contributor.authorBADEL, Eric
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorBURLETT, Régis
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
dc.contributor.authorCOCHARD, Hervé
hal.structure.identifierUniversität Ulm - Ulm University [Ulm, Allemagne]
dc.contributor.authorJANSEN, Steven
hal.structure.identifierSynchrotron SOLEIL [SSOLEIL]
dc.contributor.authorKING, Andrew
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorLAMARQUE, Laurent
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorLENOIR, Nicolas
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
dc.contributor.authorST-PAUL, Nicolas Martin
hal.structure.identifierHawkesbury Institute for the Environment [Richmond] [HIE]
dc.contributor.authorCHOAT, Brendan
dc.date.issued2020
dc.identifier.issn1286-4560
dc.description.abstractEnAbstractKey messageXylem vulnerability to drought-induced embolism did not differ between stems and petioles of four woody species (Betula pendula,Liriodendron tulipifera,Populus tremulaandOlea europaea). Our results, together with data compiled from published literature, indicate that hydraulic segmentation during drought stress is not consistently driven by difference in vulnerability to embolism between stem and terminal organs.ContextHydraulic failure and disconnection of distal organs during protracted drought stress is thought to protect large branches or trunks by reducing water loss and restricting the spread of embolism. Hydraulic segmentation and preferential sacrifice of distal organs such as leaves can be driven by two mechanisms: more negative water potentials at the terminal section of the hydraulic pathway and/or by higher vulnerability to xylem embolism of distal organs. Although vulnerability segmentation has been reported in the literature, the generality of this phenomenon is unclear, in part due to the methodological limitations related to direct measurement of xylem vulnerability to embolism in intact plants.AimsThe objective of this study was to evaluate vulnerability segmentation between petioles and stems using non-invasive micro computed tomography (microCT).MethodsVulnerability to embolism was measured in leaf petioles and subtending stems of four woody species (Betula pendula R., Liriodendron tulipifera L., Populus tremula L. and Olea europaea L.) with contrasting drought tolerances. In addition, previously published vulnerability data for petioles and stems were compiled from the literature to investigate the commonality of hydraulic segmentation across a wide range of woody species, with the vulnerability curve methodology distinguished.ResultsUsing non-invasive imaging on intact plants, we found no evidence of hydraulic segmentation between petioles and stems of four angiosperm tree species, regardless of mechanism. Moreover, the literature dataset indicated that little or no difference in vulnerability to embolism is present between petioles and stems when vulnerability curves were constructed using methods specifically measuring the dynamics of xylem tissue during dehydration (e.g. optical visualization, MicroCT).ConclusionOur results suggest that vulnerability segmentation between stems and distal organs (petioles and leaves) is limited when only xylem tissue is considered. Large differences in vulnerability between stems and leaves are likely to be driven by extra-xylary components, rather than xylem embolism.
dc.language.isoen
dc.publisherSpringer Nature (since 2011)/EDP Science (until 2010)
dc.subject.enEmbolism
dc.subject.enHydraulic segmentation
dc.subject.enMicroCT
dc.subject.enPetiole
dc.subject.enStem
dc.subject.enXylem
dc.subject.enEmbolism
dc.subject.enmicroCT
dc.title.enLack of vulnerability segmentation in four angiosperm tree species: evidence from direct X-ray microtomography observation
dc.typeArticle de revue
dc.identifier.doi10.1007/s13595-020-00944-2
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences de l'environnement/Environnement et Société
dc.subject.halSciences de l'environnement/Milieux et Changements globaux
bordeaux.journalAnnals of Forest Science
bordeaux.page37
bordeaux.volume77
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-02548945
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02548945v1
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