Daytime stomatal regulation in mature temperate trees prioritizes stem rehydration at night

Peters, Richard L. and Steppe, Kathy and Pappas, Christoforos and Zweifel, Roman and Babst, Flurin and Dietrich, Lars and von Arx, Georg and Poyatos, Rafael and Fonti, Marina and Fonti, Patrick and Grossiord, Charlotte and Gharun, Mana and Buchmann, Nina and Steger, David N. and Kahmen, Ansgar. (2023) Daytime stomatal regulation in mature temperate trees prioritizes stem rehydration at night. New Phytologist, 239 (2). pp. 533-546.

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Official URL: https://edoc.unibas.ch/95231/

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Trees remain sufficiently hydrated during drought by closing stomata and reducing canopy conductance (G; c; ) in response to variations in atmospheric water demand and soil water availability. Thresholds that control the reduction of G; c; are proposed to optimize hydraulic safety against carbon assimilation efficiency. However, the link between G; c; and the ability of stem tissues to rehydrate at night remains unclear. We investigated whether species-specific G; c; responses aim to prevent branch embolisms, or enable night-time stem rehydration, which is critical for turgor-dependent growth. For this, we used a unique combination of concurrent dendrometer, sap flow and leaf water potential measurements and collected branch-vulnerability curves of six common European tree species. Species-specific G; c; reduction was weakly related to the water potentials at which 50% of branch xylem conductivity is lost (P; 50; ). Instead, we found a stronger relationship with stem rehydration. Species with a stronger G; c; control were less effective at refilling stem-water storage as the soil dries, which appeared related to their xylem architecture. Our findings highlight the importance of stem rehydration for water-use regulation in mature trees, which likely relates to the maintenance of adequate stem turgor. We thus conclude that stem rehydration must complement the widely accepted safety-efficiency stomatal control paradigm.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Physiological Plant Ecology (Kahmen)
UniBasel Contributors:Kahmen, Ansgar and Peters, Richard and Steger, David and Dietrich, Lars
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:10 Jul 2023 09:43
Deposited On:10 Jul 2023 09:43

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