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Xylem embolism in leaves does not occur with open stomata: evidence from direct observations using the optical visualization 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
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
dc.date.issued2020-01-23
dc.identifier.issn0022-0957
dc.description.abstractEnDrought represents a major abiotic constraint to plant growth and survival. On the 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) during plant dehydration has remained controversial, largely due to methodological limitations. However, the newly developed optical visualization method now allows concurrent 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) rises 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, these species converge towards a strategy of closing stomata early to prevent water loss and delay catastrophic xylem dysfunction.
dc.language.isoen
dc.publisherOxford University Press (OUP)
dc.subject.enDrought
dc.subject.enEmbolism
dc.subject.enHydraulics
dc.subject.enoptical visualization
dc.subject.enstomatal closure
dc.subject.enwater stress
dc.subject.enxylem
dc.title.enXylem embolism in leaves does not occur with open stomata: evidence from direct observations using the optical visualization technique
dc.typeArticle de revue
dc.identifier.doi10.1093/jxb/erz474
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale
bordeaux.journalJournal of Experimental Botany
bordeaux.page1151-1159
bordeaux.volume71
bordeaux.issue3
bordeaux.peerReviewedoui
hal.identifierhal-02625168
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02625168v1
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