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Is xylem of angiosperm leaves less resistant to embolism than branches? Insights from microCT, hydraulics, and anatomy

hal.structure.identifierUniversität Ulm - Ulm University [Ulm, Allemagne]
dc.contributor.authorKLEPSCH, M.
hal.structure.identifierUniversität Ulm - Ulm University [Ulm, Allemagne]
dc.contributor.authorZHANG, Y.
hal.structure.identifierMacquarie University [Sydney]
dc.contributor.authorKOTOWSKA, M. M.
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
hal.structure.identifierEcophysiologie et Génomique Fonctionnelle de la Vigne [UMR EGFV]
dc.contributor.authorLAMARQUE, Laurent J.
hal.structure.identifierWestern Sydney University
dc.contributor.authorNOLF, M.
hal.structure.identifierGeorg-August-University = Georg-August-Universität Göttingen
dc.contributor.authorSCHULDT, B.
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
dc.contributor.authorTORRES RUIZ, Jose Manuel
hal.structure.identifierGuangxi University [Nanning]
dc.contributor.authorQIN, D. -W.
hal.structure.identifierWestern Sydney University
dc.contributor.authorCHOAT, B.
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
dc.contributor.authorSCOFFONI, C.
hal.structure.identifierGuangxi Normal University
dc.contributor.authorCAO, K. -F.
hal.structure.identifierUniversität Ulm - Ulm University [Ulm, Allemagne]
dc.contributor.authorJANSEN, S.
dc.date.issued2018
dc.identifier.issn0022-0957
dc.description.abstractEnAccording to the hydraulic vulnerability segmentation hypothesis, leaves are more vulnerable to decline of hydraulic conductivity than branches, but whether stem xylem is more embolism resistant than leaves remains unclear.Drought-induced embolism resistance of leaf xylem was investigated based on X-ray computed tomography (microCT) for Betula pendula, Laurus nobilis, and Liriodendron tulipifera, excluding outside-xylem, and compared to hydraulic vulnerability curves for branch xylem. Moreover, bordered pit characters related to embolism resistance were investigated for both organs. Theoretical P50-values (i.e., the xylem pressure corresponding to 50% loss of hydraulic conductance) of leaves were generally within the same range as hydraulic P50 values of branches. P50 values of leaves were similar to branches for L. tulipifera (-2.01 vs. -2.10 MPa, respectively), more negative for B. pendula (-2.87 vs. -1.80 MPa), and less negative for L. nobilis (-6.4 vs. -9.2 MPa). Despite more narrow conduits in leaves than branches, mean interconduit pit membrane thickness was similar in both organs, but significantly higher in leaves of B. pendula than branches. This case study indicates that xylem shows a largely similar embolism resistance across leaves and branches, although differences both within and across organs may occur, suggesting interspecific variation to the hydraulic vulnerability segmentation hypothesis.
dc.language.isoen
dc.publisherOxford University Press (OUP)
dc.title.enIs xylem of angiosperm leaves less resistant to embolism than branches? Insights from microCT, hydraulics, and anatomy
dc.typeArticle de revue
dc.identifier.doi10.1093/jxb/ery321
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale
bordeaux.journalJournal of Experimental Botany
bordeaux.page5611-5623
bordeaux.volume69
bordeaux.issue22
bordeaux.peerReviewedoui
hal.identifierhal-02536993
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02536993v1
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