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A test of the hydraulic vulnerability segmentation hypothesis in angiosperm and conifer tree species

hal.structure.identifierDepartment of Forest, Rangeland and Fire Sciences
dc.contributor.authorJOHNSON, Daniel M.
hal.structure.identifierNicholas School of the Environment
dc.contributor.authorWORTEMANN, Rémi
hal.structure.identifierDepartment of Botany
dc.contributor.authorMCCULLOH, Katherine A.
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorJORDAN-MEILLE, Lionel
hal.structure.identifierDepartment of Forestry and Environmental Resources
dc.contributor.authorWARD, Eric
hal.structure.identifierEnvironmental Sciences Division [Oak Ridge]
hal.structure.identifierClimate Change Science Institute [Oak Ridge] [CCSI]
dc.contributor.authorWARREN, Jeffrey M.
hal.structure.identifierNicholas School of the Environment
dc.contributor.authorPALMROTH, Sari
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
hal.structure.identifierDuke University
dc.contributor.authorDOMEC, Jean-Christophe
dc.date.accessioned2024-04-08T12:11:40Z
dc.date.available2024-04-08T12:11:40Z
dc.date.issued2016
dc.identifier.issn0829-318X
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/196703
dc.description.abstractEnWater transport from soils to the atmosphere is critical for plant growth and survival. However, we have a limited understanding about many portions of the whole-tree hydraulic pathway, because the vast majority of published information is on terminal branches. Our understanding of mature tree trunk hydraulic physiology, in particular, is limited. The hydraulic vulnerability segmentation hypothesis (HVSH) stipulates that distal portions of the plant (leaves, branches and roots) should be more vulnerable to embolism than trunks, which are nonredundant organs that require a massive carbon investment. In the current study, we compared vulnerability to loss of hydraulic function, leaf and xylem water potentials and the resulting hydraulic safety margins (in relation to the water potential causing 50% loss of hydraulic conductivity) in leaves, branches, trunks and roots of four angiosperms and four conifer tree species. Across all species, our results supported strongly the HVSH as leaves and roots were less resistant to embolism than branches or trunks. However, branches were consistently more resistant to embolism than any other portion of the plant, including trunks. Also, calculated whole-tree vulnerability to hydraulic dysfunction was much greater than vulnerability in branches. This was due to hydraulic dysfunction in roots and leaves at less negative water potentials than those causing branch or trunk dysfunction. Leaves and roots had narrow or negative hydraulic safety margins, but trunks and branches maintained positive safety margins. By using branch-based hydraulic information as a proxy for entire plants, much research has potentially overestimated embolism resistance, and possibly drought tolerance, for many species. This study highlights the necessity to reconsider past conclusions made about plant resistance to drought based on branch xylem only. This study also highlights the necessity for more research of whole-plant hydraulic physiology to better understand strategies of plant drought tolerance and the critical control points within the hydraulic pathway.
dc.language.isoen
dc.publisherOxford University Press (OUP)
dc.subjectpotentiel hydrique
dc.subjectconductivité hydraulique
dc.subjecttolérance à la sécheresse
dc.subject.encavitation
dc.subject.enwater relations
dc.subject.enwater potential
dc.subject.entranspiration
dc.subject.enpermeability coefficient
dc.subject.enembolism
dc.subject.endrought
dc.title.enA test of the hydraulic vulnerability segmentation hypothesis in angiosperm and conifer tree species
dc.typeArticle de revue
dc.identifier.doi10.1093/treephys/tpw031
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale
bordeaux.journalTree Physiology
bordeaux.page983-993
bordeaux.volume36
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue8
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-01512008
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01512008v1
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