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Are needles of Pinus pinaster more vulnerable to xylem embolism than branches? New insights from X-ray computed tomography

hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
hal.structure.identifierInstitute for Systematic Botany and Ecology
dc.contributor.authorBOUCHE, Pauline S.
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
hal.structure.identifierHawkesbury Institute for the Environment
dc.contributor.authorCHOAT, Brendan
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
dc.contributor.authorBADEL, Eric
hal.structure.identifierSchool of Plant Science
dc.contributor.authorBRODRIBB, Timothy J.
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorBURLETT, Régis
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
dc.contributor.authorCOCHARD, Hervé
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
dc.contributor.authorCHARRA-VASKOU, Katline
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorLAVIGNE, Bruno
hal.structure.identifierInstitute for Systematic Botany and Ecology
dc.contributor.authorLI, Shan
hal.structure.identifierDepartment of Botany
dc.contributor.authorMAYR, Stefan
hal.structure.identifierInstitute for Systematic Botany and Ecology
dc.contributor.authorMORRIS, Hugh
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorTORRES RUIZ, Jose Manuel
hal.structure.identifierAgroscope
dc.contributor.authorZUFFEREY, Vivian
hal.structure.identifierInstitute for Systematic Botany and Ecology
dc.contributor.authorJANSEN, Steven
dc.date.issued2016
dc.identifier.issn0140-7791
dc.description.abstractEnPlants can be highly segmented organisms with an independently redundant design of organs. In the context of plant hydraulics, leaves may be less embolism resistant than stems, allowing hydraulic failure to be restricted to distal organs that can be readily replaced. We quantified drought-induced embolism in needles and stems of Pinus pinaster using high-resolution computed tomography (HRCT). HRCT observations of needles were compared with the rehydration kinetics method to estimate the contribution of extra-xylary pathways to declining hydraulic conductance. High-resolution computed tomography images indicated that the pressure inducing 50% of embolized tracheids was similar between needle and stem xylem (P50 needle xylem = −3.62 MPa, P50 stem xylem = −3.88 MPa). Tracheids in both organs showed no difference in torus overlap of bordered pits. However, estimations of the pressure inducing 50% loss of hydraulic conductance at the whole needle level by the rehydration kinetics method were significantly higher (P50 needle = −1.71 MPa) than P50 needle xylem derived from HRCT. The vulnerability segmentation hypothesis appears to be valid only when considering hydraulic failure at the entire needle level, including extra-xylary pathways. Our findings suggest that native embolism in needles is limited and highlight the importance of imaging techniques for vulnerability curves.
dc.language.isoen
dc.publisherWiley
dc.subjecthydraulic failures
dc.subject.enconifer
dc.subject.enembolised tracheids
dc.subject.enwall deformation
dc.subject.endirect visualization of water content
dc.title.enAre needles of Pinus pinaster more vulnerable to xylem embolism than branches? New insights from X-ray computed tomography
dc.typeArticle de revue
dc.identifier.doi10.1111/pce.12680
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences de l'environnement
dc.description.sponsorshipEuropeInternational Mobility Programme to Strengthen Skills and Excellence in Research for Agriculture
bordeaux.journalPlant, Cell and Environment
bordeaux.page860–870
bordeaux.volume39
bordeaux.issue4
bordeaux.peerReviewedoui
hal.identifierhal-02634983
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02634983v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Plant,%20Cell%20and%20Environment&rft.date=2016&rft.volume=39&rft.issue=4&rft.spage=860%E2%80%93870&rft.epage=860%E2%80%93870&rft.eissn=0140-7791&rft.issn=0140-7791&rft.au=BOUCHE,%20Pauline%20S.&DELZON,%20Sylvain&CHOAT,%20Brendan&BADEL,%20Eric&BRODRIBB,%20Timothy%20J.&rft.genre=article


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