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Aridity drove the evolution of extreme embolism resistance and the radiation of conifer genus Callitris

hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorLARTER, Maximilian
hal.structure.identifierHawkesbury Institute for the Environment [Richmond] [HIE]
dc.contributor.authorPFAUTSCH, Sebastian
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
hal.structure.identifierNicholas School of the Environment
dc.contributor.authorDOMEC, Jean-Christophe
hal.structure.identifierDepartment of Ecology and Evolutionary Biology [Faculty of Biology]
hal.structure.identifierBotanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
dc.contributor.authorTRUEBA, Santiago
hal.structure.identifierNational Herbarium of New South Wales
dc.contributor.authorNAGALINGUM, Nathalie
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
dc.date.issued2017
dc.identifier.issn0028-646X
dc.description.abstractEnXylem vulnerability to embolism is emerging as a major factor in drought-induced tree mortality events across the globe. However, we lack understanding of how and to what extent climate has shaped vascular properties or functions. We investigated the evolution of xylem hydraulic function and diversification patterns in Australia's most successful gymnosperm clade, Callitris, the world's most drought-resistant conifers. For all 23 species in this group, we measured embolism resistance (P50 ), xylem specific hydraulic conductivity (Ks ), wood density, and tracheary element size from natural populations. We investigated whether hydraulic traits variation linked with climate and the diversification of this clade using a time-calibrated phylogeny. Embolism resistance varied widely across the Callitris clade (P50 : -3.8 to -18.8 MPa), and was significantly related to water scarcity, as was tracheid diameter. We found no evidence of a safety-efficiency tradeoff; Ks and wood density were not related to rainfall. Callitris diversification coincides with the onset of aridity in Australia since the early Oligocene. Our results highlight the evolutionary lability of xylem traits with climate, and the leading role of aridity in the diversification of conifers. The uncoupling of safety from other xylem functions allowed Callitris to evolve extreme embolism resistance and diversify into xeric environments.
dc.description.sponsorshipPlateforme d'Innovation " Forêt-Bois-Fibre-Biomasse du Futur "
dc.language.isoen
dc.publisherWiley
dc.rights.urihttp://creativecommons.org/licenses/by-sa/
dc.subjecttransfert hydraulique
dc.subjectxylème
dc.subjectchangement climatique
dc.subjectaustralie
dc.subjectembolie
dc.subject.endrought
dc.subject.enclimate change
dc.subject.endiversification
dc.subject.enecophysiology
dc.subject.enembolism resistance
dc.subject.enevolution
dc.subject.engymnosperms
dc.subject.enxylem
dc.subject.englobal change
dc.subject.enembolism
dc.title.enAridity drove the evolution of extreme embolism resistance and the radiation of conifer genus Callitris
dc.typeArticle de revue
dc.identifier.doi10.1111/nph.14545
dc.subject.halSciences du Vivant [q-bio]
bordeaux.journalNew Phytologist
bordeaux.page97-112
bordeaux.volume215
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-01606790
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01606790v1
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