Afficher la notice abrégée

Vulnerability and hydraulic segmentations at the stem‐leaf transition: Coordination across Neotropical trees

hal.structure.identifierBotanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
hal.structure.identifierEcologie des forêts de Guyane [UMR ECOFOG]
dc.contributor.authorLEVIONNOIS, Sébastien
hal.structure.identifierEcologie des forêts de Guyane [UMR ECOFOG]
dc.contributor.authorZIEGLER, Camille
hal.structure.identifierUniversität Ulm - Ulm University [Ulm, Allemagne]
dc.contributor.authorJANSEN, Steven
dc.contributor.authorCALVET, Emma
hal.structure.identifierEcologie des forêts de Guyane [ECOFOG]
dc.contributor.authorCOSTE, Sabrina
hal.structure.identifierEcologie des forêts de Guyane [UMR ECOFOG]
dc.contributor.authorSTAHL, Clément
hal.structure.identifierBotanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
dc.contributor.authorSALMON, Camille
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
hal.structure.identifierCentre National de la Recherche Scientifique [CNRS]
hal.structure.identifierEcologie des forêts de Guyane [UMR ECOFOG]
dc.contributor.authorGUICHARD, Charlotte
hal.structure.identifierBotanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
dc.contributor.authorHEURET, Patrick
dc.date.issued2020
dc.identifier.issn0028-646X
dc.description.abstractEnHydraulic segmentation at the stem-leaf transition predicts higher hydraulic resistance in leaves than in stems. Vulnerability segmentation, however, predicts lower embolism resistance in leaves. Both mechanisms should theoretically favour runaway embolism in leaves to preserve expensive organs such as stems, and should be tested for any potential coordination. We investigated the theoretical leaf-specific conductivity based on an anatomical approach to quantify the degree of hydraulic segmentation across 21 tropical rainforest tree species. Xylem resistance to embolism in stems (flow-centrifugation technique) and leaves (optical visualisation method) was quantified to assess vulnerability segmentation. We found a pervasive hydraulic segmentation across species, but with a strong variability in the degree of segmentation. Despite a clear continuum in the degree of vulnerability segmentation, eight species showed a positive vulnerability segmentation (leaves less resistant to embolism than stems), while the remaining species studied exhibited a negative or no vulnerability segmentation. The degree of vulnerability segmentation was positively related to the degree of hydraulic segmentation, such that segmented species promote both mechanisms to hydraulically decouple leaf xylem from stem xylem. To what extent hydraulic and vulnerability segmentation determine drought resistance requires further integration of the leaf-stem transition at the whole-plant level, including both xylem and outer-xylem tissue.
dc.description.sponsorshipRecherches Avancées sur l'Arbre et les Ecosytèmes Forestiers - ANR-11-LABX-0002
dc.description.sponsorshipCEnter of the study of Biodiversity in Amazonia - ANR-10-LABX-0025
dc.language.isoen
dc.publisherWiley
dc.subject.enTropical trees
dc.subject.enVulnerability segmentation
dc.subject.enHydraulic segmentation
dc.subject.enStem‐leaf transition
dc.subject.enDrought‐induced embolism resistance
dc.subject.enLeaf‐specific conductivity
dc.subject.enFrench Guiana
dc.title.enVulnerability and hydraulic segmentations at the stem‐leaf transition: Coordination across Neotropical trees
dc.typeArticle de revue
dc.identifier.doi10.1111/nph.16723
dc.subject.halSciences du Vivant [q-bio]/Biodiversité/Systématique, phylogénie et taxonomie
dc.subject.halSciences du Vivant [q-bio]/Ecologie, Environnement/Ecosystèmes
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale/Botanique
dc.subject.halSciences de l'environnement/Biodiversité et Ecologie
bordeaux.journalNew Phytologist
bordeaux.page512-524
bordeaux.volume228
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-02871214
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02871214v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=New%20Phytologist&rft.date=2020&rft.volume=228&rft.issue=2&rft.spage=512-524&rft.epage=512-524&rft.eissn=0028-646X&rft.issn=0028-646X&rft.au=LEVIONNOIS,%20S%C3%A9bastien&ZIEGLER,%20Camille&JANSEN,%20Steven&CALVET,%20Emma&COSTE,%20Sabrina&rft.genre=article


Fichier(s) constituant ce document

FichiersTailleFormatVue

Il n'y a pas de fichiers associés à ce document.

Ce document figure dans la(les) collection(s) suivante(s)

Afficher la notice abrégée