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Drought survival in conifer species is related to the time required to cross the stomatal safety margin

hal.structure.identifierInstitute of Botany,
dc.contributor.authorPETEK-PETRIK, Anja
hal.structure.identifierKarlsruhe Institute of Technology = Karlsruher Institut für Technologie [KIT]
dc.contributor.authorPETRÍK, Peter
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
hal.structure.identifierUniversité du Québec à Trois-Rivières [UQTR]
dc.contributor.authorLAMARQUE, Laurent
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
dc.contributor.authorCOCHARD, Hervé
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorBURLETT, Régis
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
dc.date.issued2023-11-21
dc.identifier.issn0022-0957
dc.description.abstractEnThe regulation of water loss and the spread of xylem embolism have mostly been considered separately. The development of an integrated approach taking into account the temporal dynamics and relative contributions of these mechanisms to plant drought responses is urgently needed. Do conifer species native to mesic and xeric environments display different hydraulic strategies and temporal sequences under drought? A dry-down experiment was performed on seedlings of four conifer species differing in embolism resistance, from drought-sensitive to extremely drought-resistant species. A set of traits related to drought survival was measured, including turgor loss point, stomatal closure, minimum leaf conductance, and xylem embolism resistance. All species reached full stomatal closure before the onset of embolism, with all but the most drought-sensitive species presenting large stomatal safety margins, demonstrating that highly drought-resistant species do not keep their stomata open under drought conditions. Plant dry-down time to death was significantly influenced by the xylem embolism threshold, stomatal safety margin, and minimum leaf conductance, and was best explained by the newly introduced stomatal margin retention index (SMRIΨ50) which reflects the time required to cross the stomatal safety margin. The SMRIΨ50 may become a key tool for the characterization of interspecific drought survival variability in trees.
dc.language.isoen
dc.publisherOxford University Press (OUP)
dc.subject.enDrought tolerance
dc.subject.enembolism resistance
dc.subject.enresidual transpiration
dc.subject.enstomatal closure
dc.subject.enstomatal safety margin
dc.subject.entree mortality
dc.title.enDrought survival in conifer species is related to the time required to cross the stomatal safety margin
dc.typeArticle de revue
dc.identifier.doi10.1093/jxb/erad352
dc.subject.halSciences de l'environnement
bordeaux.journalJournal of Experimental Botany
bordeaux.page6847-6859
bordeaux.volume74
bordeaux.issue21
bordeaux.peerReviewedoui
hal.identifierhal-04399804
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04399804v1
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