ZHANG, Ya; LAMARQUE, Laurent J.; TORRES RUIZ, Jose Manuel; SCHULDT, Bernhard; KARIMI, Zohreh; LI, Shan; QIN, De-Wen; BITTENCOURT, Paulo; BURLETT, Régis; CAO, Kun-Fang; DELZON, Sylvain; OLIVEIRA, Rafael; PEREIRA, Luciano; JANSEN, Steven

doi:10.1093/treephys/tpy015

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Licence d’utilisation du document

http://creativecommons.org/licenses/by-nc/

ZHANG, Ya
Universität Ulm - Ulm University [Ulm, Allemagne]

LAMARQUE, Laurent J.
Biodiversité, Gènes & Communautés [BioGeCo]
Ecophysiologie et Génomique Fonctionnelle de la Vigne [UMR EGFV]

TORRES RUIZ, Jose Manuel
Biodiversité, Gènes & Communautés [BioGeCo]

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Article de revue

Ce document a été publié dans

Tree Physiology. 2018, vol. 38, n° 7, p. 1016-1025

Oxford University Press (OUP)

Résumé en anglais

Methods to estimate xylem embolism resistance generally rely on hydraulic measurements, which can be far from straightforward. Recently, a pneumatic method based on air flow measurements of terminal branch ends was proposed to construct vulnerability curves by linking the amount of air extracted from a branch with the degree of embolism. We applied this novel technique for 10 temperate tree species, including six diffuse, two ring-porous and two gymnosperm species, and compared the pneumatic curves with hydraulic ones obtained from either the flow-centrifuge or the hydraulic-bench dehydration method. We found that the pneumatic method provides a good estimate of the degree of xylem embolism for all angiosperm species. The xylem pressure at 50% and 88% loss of hydraulic conductivity (i.e., Ψ50 and Ψ88) based on the methods applied showed a strongly significant correlation for all eight angiosperms. However, the pneumatic method showed significantly reduced Ψ50 values for the two conifers. Our findings suggest that the pneumatic method could provide a fast and accurate approach for angiosperms due to its convenience and feasibility, at least within the range of embolism resistances covered by our samples.< Réduire

Mots clés

Embolie

Transport xylème

Arbre forestier

Gymnosperme

Analyse comparative

Courbe de vulnérabilité

Modélisation hydraulique

Mots clés en anglais

Angiosperms

Bench Dehydration

Conifers

Embolism

Flow-Centrifuge

Pneumatic Method

Secondary Xylem

Vulnerability Curve

DOI

http://dx.doi.org/10.1093/treephys/tpy015

Project ANR

Initiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003

Origine

Importé de hal

Unités de recherche

BioGeCo (Biodiversité Gènes & Communautés) - UMR 1202