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Stem xylem resistance to cavitation is related to xylem structure but not to growth and water-use efficiency at the within-population level in Populus nigra L.

hal.structure.identifierUnité de recherche Amélioration, Génétique et Physiologie Forestières [AGPF]
hal.structure.identifierLaboratoire de Biologie des Ligneux et des Grandes Cultures [LBLGC]
dc.contributor.authorGUET, Justine
hal.structure.identifierLaboratoire de Biologie des Ligneux et des Grandes Cultures [LBLGC]
dc.contributor.authorFICHOT, Régis
hal.structure.identifierUnité de recherche Amélioration, Génétique et Physiologie Forestières [AGPF]
hal.structure.identifierLaboratoire de Biologie des Ligneux et des Grandes Cultures [LBLGC]
dc.contributor.authorLEDÉE, Camille
hal.structure.identifierUnité de recherche Amélioration, Génétique et Physiologie Forestières [AGPF]
dc.contributor.authorLAURANS, Françoise
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
dc.contributor.authorCOCHARD, Hervé
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
hal.structure.identifierUnité de recherche Amélioration, Génétique et Physiologie Forestières [AGPF]
dc.contributor.authorBASTIEN, Catherine
hal.structure.identifierLaboratoire de Biologie des Ligneux et des Grandes Cultures [LBLGC]
dc.contributor.authorBRIGNOLAS, Franck
dc.date.issued2015
dc.identifier.issn0022-0957
dc.description.abstractEnXylem resistance to drought-induced cavitation is a key trait of plant water relations. This study assesses the genetic variation expressed for stem cavitation resistance within a population of a riparian species, the European black poplar (Populus nigra L.), and explores its relationships with xylem anatomy, water-use efficiency (WUE), and growth. Sixteen structural and physiological traits related to cavitation resistance, xylem anatomy, growth, bud phenology, and WUE were measured on 33 P. nigra genotypes grown under optimal irrigation in a 2-year-old clonal experiment in a nursery. Significant genetic variation was expressed for the xylem tension inducing 50% loss of hydraulic conductivity (Ψ50) within the studied population, as attested by the high value of broad-sense heritability estimated for this trait (H 2 ind = 0.72). Stem cavitation resistance was associated with xylem structure: the more cavitation-resistant genotypes exhibited lower hydraulic efficiency and higher mechanical reinforcement as assessed from stem xylem cross sections. By contrast, Ψ50 was not significantly related to shoot height increment, total above-ground dry mass, or bulk leaf carbon isotope discrimination, a proxy for intrinsic WUE. These findings indicate that the trade-offs between xylem resistance to cavitation, hydraulic efficiency, and mechanical reinforcement can occur at the within-population level. Given that the studied genotypes were exposed to the same environmental conditions and evolutionary drivers in situ, the trade-offs detected at this scale are expected to reflect true functional relationships.
dc.language.isoen
dc.publisherOxford University Press (OUP)
dc.subjectbud phenology
dc.subjectPopulus nigra
dc.subject.enbulk leaf carbon isotope discrimination
dc.subject.endrought-induced cavitation
dc.subject.enfunctional trade-offs
dc.subject.engrowth
dc.subject.enriparian species
dc.subject.enwater-use efficiency
dc.subject.enxylem structure
dc.title.enStem xylem resistance to cavitation is related to xylem structure but not to growth and water-use efficiency at the within-population level in Populus nigra L.
dc.typeArticle de revue
dc.identifier.doi10.1093/jxb/erv232
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale
bordeaux.journalJournal of Experimental Botany
bordeaux.page4643-4652
bordeaux.volume66
bordeaux.issue15
bordeaux.peerReviewedoui
hal.identifierhal-02639351
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02639351v1
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