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Pit and tracheid anatomy explain hydraulic safety but not hydraulic efficiency of 28 conifer species

hal.structure.identifierWageningen University and Research [Wageningen] [WUR]
hal.structure.identifierForest Ecology and Forest Management Group
dc.contributor.authorSONG, Yanjun
hal.structure.identifierWageningen University and Research [Wageningen] [WUR]
hal.structure.identifierForest Ecology and Forest Management Group
dc.contributor.authorPOORTER, Lourens
hal.structure.identifierWageningen University and Research [Wageningen] [WUR]
hal.structure.identifierForest Ecology and Forest Management Group
dc.contributor.authorHORSTING, Angelina
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
hal.structure.identifierWageningen University and Research [Wageningen] [WUR]
hal.structure.identifierForest Ecology and Forest Management Group
dc.contributor.authorSTERCK, Frank
dc.date.issued2021-10-09
dc.identifier.issn0022-0957
dc.description.abstractEnConifers face increased drought mortality risks because of drought-induced embolism in their vascular system. Variation in embolism resistance may result from species differences in pit structure and function, as pits control the air seeding between water-transporting conduits. This study quantifies variation in embolism resistance and hydraulic conductivity for 28 conifer species grown in a 50-year-old common garden experiment and assesses the underlying mechanisms. Conifer species with a small pit aperture, high pit aperture resistance, and large valve effect were more resistant to embolism, as they all may reduce air seeding. Surprisingly, hydraulic conductivity was only negatively correlated with tracheid cell wall thickness. Embolism resistance and its underlying pit traits related to pit size and sealing were more strongly phylogenetically controlled than hydraulic conductivity and anatomical tracheid traits. Conifers differed in hydraulic safety and hydraulic efficiency, but there was no trade-off between safety and efficiency because they are driven by different xylem anatomical traits that are under different phylogenetic control. We used a common garden experiment to assess the mechanisms underlying embolism resistance and hydraulic conductivity of conifer species. Pit size and sealing explain embolism resistance, while hydraulic conductivity is only related to wall thickness.
dc.language.isoen
dc.publisherOxford University Press (OUP)
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.subject.enCavitation resistance
dc.subject.enconifer species
dc.subject.enembolism
dc.subject.enhydraulic efficiency
dc.subject.enphylogeny
dc.subject.enpit sealing
dc.subject.enpit size
dc.title.enPit and tracheid anatomy explain hydraulic safety but not hydraulic efficiency of 28 conifer species
dc.typeArticle de revue
dc.identifier.doi10.1093/jxb/erab449
dc.subject.halSciences de l'environnement
bordeaux.journalJournal of Experimental Botany
bordeaux.page1033 - 1048
bordeaux.volume73
bordeaux.issue3
bordeaux.peerReviewedoui
hal.identifierhal-03614685
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03614685v1
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