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

dc.rights.licenseopenen_US
dc.contributor.authorKLEPSCH, M.
dc.contributor.authorZHANG, Y.
dc.contributor.authorKOTOWSKA, M. M.
hal.structure.identifierEcophysiologie et Génomique Fonctionnelle de la Vigne [UMR EGFV]
dc.contributor.authorLAMARQUE, Laurent J.
dc.contributor.authorNOLF, M.
dc.contributor.authorSCHULDT, B.
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorTORRES RUIZ, Jose Manuel
dc.contributor.authorQIN, D. -W.
dc.contributor.authorCHOAT, B.
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
dc.contributor.authorSCOFFONI, C.
dc.contributor.authorCAO, K. -F.
dc.contributor.authorJANSEN, S.
dc.date.accessioned2020-04-08T13:07:25Z
dc.date.available2020-04-08T13:07:25Z
dc.date.issued2018
dc.identifier.issn0022-0957en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/4181
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.isoENen_US
dc.title.enIs xylem of angiosperm leaves less resistant to embolism than branches? Insights from microCT, hydraulics, and anatomy
dc.title.alternativeJ. exp. bot.en_US
dc.typeArticle de revueen_US
dc.identifier.doi10.1093/jxb/ery321en_US
dc.subject.halSciences du Vivant [q-bio]/Biologie végétaleen_US
bordeaux.journalJournal of Experimental Botanyen_US
bordeaux.page5611-5623en_US
bordeaux.volume69en_US
bordeaux.hal.laboratoriesEcophysiologie et Génomique Fonctionnelle de la Vigne (EGFV) - UMR 1287en_US
bordeaux.issue22en_US
bordeaux.institutionBordeaux Sciences Agroen_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
hal.identifierhal-02536993
hal.version1
hal.date.transferred2020-04-08T13:07:32Z
hal.exporttrue
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