Testing the plant pneumatic method to estimate xylem embolism resistance in stems of temperate trees
2018
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 | Universität Ulm - Ulm University [Ulm, Allemagne] | Biodiversité, Gènes & Communautés (BioGeCo) ; Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB) | Ecophysiologie et Génomique Fonctionnelle de la Vigne (UMR EGFV) ; Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-Institut des Sciences de la Vigne et du Vin (ISVV)-Ecole Nationale Supérieure des Sciences Agronomiques de Bordeaux-Aquitaine (Bordeaux Sciences Agro) | Georg-August-University of Göttingen = Georg-August-Universität Göttingen | Golestan University | Guangxi University [Nanning] (GXU) | Institute of Computing [Campinas] (IC) ; Universidade Estadual de Campinas = University of Campinas (UNICAMP) | ANR-10-IDEX-0003,IDEX BORDEAUX,Initiative d'excellence de l'Université de Bordeaux(2010)
International audience
Mostrar más [+] Menos [-]Inglés. 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.
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