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Embolism resistance in petioles and leaflets of palms

hal.structure.identifierRoyal Botanic Gardens [Kew]
dc.contributor.authorEMILIO, Thaise
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorLAMARQUE, Laurent
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
dc.contributor.authorTORRES RUIZ, Jose Manuel
hal.structure.identifierSynchrotron SOLEIL [SSOLEIL]
dc.contributor.authorKING, Andrew
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
dc.contributor.authorCHARRIER, Guillaume
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorBURLETT, Régis
hal.structure.identifierRoyal Botanic Gardens [Kew]
dc.contributor.authorCONEJERO, Maria
hal.structure.identifierRoyal Botanic Gardens [Kew]
dc.contributor.authorRUDALL, Paula J
hal.structure.identifierRoyal Botanic Gardens [Kew]
dc.contributor.authorBAKER, William J
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
dc.date.issued2019
dc.identifier.issn0305-7364
dc.description.abstractEnHydraulic studies are currently biased towards conifers and dicotyledonous angiosperms; responses of arborescent monocots to increasing temperature and drought remain poorly known. This study aims to assess xylem resistance to drought-induced embolism in palms.We quantified embolism resistance via P50 (xylem pressure inducing 50 % embolism or loss of hydraulic conductivity) in petioles and leaflets of six palm species differing in habitat and phylogenetic relatedness using three techniques: in vivo X-ray-based microcomputed tomography, the in situ flow centrifuge technique and the optical vulnerability method.Our results show that P50 of petioles varies greatly in the palm family, from −2.2 ± 0.4 MPa in Dypsis baronii to −5.8 ± 0.3 MPa in Rhapis excelsa (mean ± s.e.). No difference or weak differences were found between petioles and leaf blades within species. Surprisingly, where differences occurred, leaflets were less vulnerable to embolism than petioles. Embolism resistance was not correlated with conduit size (r = 0.37, P = 0.11).This study represents the first estimate of drought-induced xylem embolism in palms across biomes and provides the first step towards understanding hydraulic adaptations in long-lived arborescent monocots. It showed an almost 3-fold range of embolism resistance between palm species, as large as that reported in all angiosperms. We found little evidence for hydraulic segmentation between leaflets and petioles in palms, suggesting that when it happens, hydraulic segregation may lack a clear relationship with organ cost or replaceability.
dc.language.isoen
dc.publisherOxford University Press (OUP)
dc.subjectrayon x
dc.subjectembolie
dc.subjectpalmier
dc.subjectsynchrotron
dc.subjectpalmae
dc.subjectxylème
dc.subjectrésistance à la sécheresse
dc.subject.enoptical vulnerability method
dc.subject.enmicro-CT X-ray
dc.subject.endrought resistance
dc.subject.enArecaceae
dc.subject.enpalms
dc.subject.enP50
dc.subject.ensynchrotron
dc.subject.enxylem embolism resistance
dc.subject.enpalm tree
dc.subject.enxylem
dc.subject.enx ray
dc.subject.enembolism
dc.title.enEmbolism resistance in petioles and leaflets of palms
dc.typeArticle de revue
dc.identifier.doi10.1093/aob/mcz104
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale
bordeaux.journalAnnals of Botany
bordeaux.page1173-1183
bordeaux.volume124
bordeaux.issue7
bordeaux.peerReviewedoui
hal.identifierhal-02306103
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02306103v1
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