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Xylem embolism in leaves does not occur with open stomata: evidence from direct observations using the optical visualisation technique

hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
dc.contributor.authorCREEK, Danielle
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.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorPARISE, Camille
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorBURLETT, Régis
hal.structure.identifierWestern Sydney University
dc.contributor.authorTISSUE, David T.
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
dc.date.accessioned2022-10-12T13:21:34Z
dc.date.available2022-10-12T13:21:34Z
dc.date.issued2019
dc.date.conference2019-09-25
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/157999
dc.description.abstractEnDrought represents a major abiotic constraint to plant growth and survival. On one hand, plants keep stomata open for efficient carbon assimilation, while on the other hand, they close them to prevent permanent hydraulic impairment from xylem embolism. The order of occurrence of these two processes (stomatal closure and the onset of leaf embolism) throughout plant dehydration has remained controversial, largely due to methodological limitations. However, the newly developed Optical Visualisation (OV) method now allows simultaneous monitoring of stomatal behaviour and leaf embolism formation in intact plants. We used this new approach directly by dehydrating intact saplings of three contrasting tree species and indirectly by conducting a literature survey across a greater range of plant taxa. Our results indicate that increasing water stress generates the onset of leaf embolism consistently after stomatal closure, and that the lag time between these processes (i.e. the safety margin) increases with increasing embolism resistance. This suggests that during water stress, embolism-mediated declines in leaf hydraulic conductivity are unlikely to act as a signal for stomatal down-regulation. Instead, plants converge towards a strategy of closing stomata early to prevent water loss and delay catastrophic xylem dysfunction.
dc.language.isoen
dc.publisherUniv. Degli Studi Di Padova
dc.publisher.location(italy)
dc.subjectstress hydrique
dc.subjectsécheresse
dc.subject.enwater stress
dc.subject.ensécheresse
dc.subject.endrought
dc.title.enXylem embolism in leaves does not occur with open stomata: evidence from direct observations using the optical visualisation technique
dc.typeCommunication dans un congrès avec actes
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale
bordeaux.page84
bordeaux.hal.laboratoriesBioGeCo (Biodiversité Gènes & Communautés) - UMR 1202*
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionINRAE
bordeaux.countryIT
bordeaux.title.proceeding4th Xylem International Meeting
bordeaux.conference.cityPadoue
bordeaux.peerReviewedoui
hal.identifierhal-02307760
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02307760v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2019&rft.spage=84&rft.epage=84&rft.au=CREEK,%20Danielle&LAMARQUE,%20Laurent&TORRES%20RUIZ,%20Jose%20Manuel&PARISE,%20Camille&BURLETT,%20R%C3%A9gis&rft.genre=proceeding


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