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Hydraulic vulnerability segmentation in compound-leaved trees: Evidence from an embolism visualization technique

hal.structure.identifierChinese Academy of Sciences [Beijing] [CAS]
hal.structure.identifierShanghai Normal University [SHNU]
dc.contributor.authorSONG, Jia
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorTRUEBA, Santiago
hal.structure.identifierChinese Academy of Sciences [Beijing] [CAS]
dc.contributor.authorYIN, Xiao-Han
hal.structure.identifierGuangxi University [Nanning]
dc.contributor.authorCAO, Kun-Fang
hal.structure.identifierUniversity of Tasmania [Hobart, Australia] [UTAS]
dc.contributor.authorBRODRIBB, Timothy
hal.structure.identifierChinese Academy of Sciences [Beijing] [CAS]
dc.contributor.authorHAO, Guang-You
dc.date.issued2022-05-01
dc.identifier.issn0032-0889
dc.description.abstractEnThe hydraulic vulnerability segmentation (HVS) hypothesis implies the existence of differences in embolism resistance between plant organs along the xylem pathway and has been suggested as an adaptation allowing the differential preservation of more resource-rich tissues during drought stress. Compound leaves in trees are considered a low-cost means of increasing leaf area and may thus be expected to show evidence of strong HVS, given the tendency of compound-leaved tree species to shed their leaf units during drought. However, the existence and role of HVS in compound-leaved tree species during drought remain uncertain. We used an optical visualization technique to estimate embolism occurrence in stems, petioles, and leaflets of shoots in two compound-leaved tree species, Manchurian ash (Fraxinus mandshurica) and Manchurian walnut (Juglans mandshurica). We found higher (less negative) water potentials corresponding to 50% loss of conductivity (P50) in leaflets and petioles than in stems in both species. Overall, we observed a consistent pattern of stem > petiole > leaflet in terms of xylem resistance to embolism and hydraulic safety margins (i.e. the difference between mid-day water potential and P50). The coordinated variation in embolism vulnerability between organs suggests that during drought conditions, trees benefit from early embolism and subsequent shedding of more expendable organs such as leaflets and petioles, as this provides a degree of protection to the integrity of the hydraulic system of the more carbon costly stems. Our results highlight the importance of HVS as an adaptive mechanism of compound-leaved trees to withstand drought stress.
dc.language.isoen
dc.publisherOxford University Press ; American Society of Plant Biologists
dc.title.enHydraulic vulnerability segmentation in compound-leaved trees: Evidence from an embolism visualization technique
dc.typeArticle de revue
dc.identifier.doi10.1093/plphys/kiac034
dc.subject.halSciences de l'environnement
bordeaux.journalPlant Physiology
bordeaux.page204-214
bordeaux.volume189
bordeaux.issue1
hal.identifierhal-04115279
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04115279v1
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