Article (Scientific journals)
Daytime stomatal regulation in mature temperate trees prioritizes stem rehydration at night.
Peters, Richard; Steppe, Kathy; Pappas, Christoforos et al.
2023In New Phytologist, 239 (2), p. 533 - 546
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Keywords :
European forests; canopy conductance; dendrometer; hydraulic traits; leaf water potential; sap flow; stomatal control; wood anatomy; Water; Xylem/physiology; Water/physiology; Droughts; Fluid Therapy; Trees/physiology; Plant Leaves/physiology; Plant Leaves; Trees; Xylem; Physiology; Plant Science
Abstract :
[en] Trees remain sufficiently hydrated during drought by closing stomata and reducing canopy conductance (Gc ) in response to variations in atmospheric water demand and soil water availability. Thresholds that control the reduction of Gc are proposed to optimize hydraulic safety against carbon assimilation efficiency. However, the link between Gc and the ability of stem tissues to rehydrate at night remains unclear. We investigated whether species-specific Gc 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 Gc reduction was weakly related to the water potentials at which 50% of branch xylem conductivity is lost (P50 ). Instead, we found a stronger relationship with stem rehydration. Species with a stronger Gc 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.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Peters, Richard  ;  Université de Liège - ULiège > TERRA Research Centre > Gestion durable des bio-agresseurs ; Laboratory of Plant Ecology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, B-9000, Ghent, Belgium ; Forest Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
Steppe, Kathy ;  Laboratory of Plant Ecology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, B-9000, Ghent, Belgium
Pappas, Christoforos ;  Department of Civil Engineering, University of Patras, Rio, Patras, 26504, Greece
Zweifel, Roman ;  Forest Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
Babst, Flurin ;  School of Natural Resources and the Environment, University of Arizona, East Lowell Street 1064, Tucson, AZ, 85721, USA ; Laboratory of Tree-Ring Research, University of Arizona, East Lowell Street 1215, Tucson, AZ, 857121, USA
Dietrich, Lars ;  Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
von Arx, Georg ;  Forest Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland ; Oeschger Centre for Climate Change Research, University of Bern, 3012, Bern, Switzerland
Poyatos, Rafael ;  CREAF, E08193 Bellaterra (Cerdanyola del Vallès), Catalonia, Spain ; Universitat Autònoma de Barcelona, E08193 Bellaterra (Cerdanyola del Vallès), Catalonia, Spain
Fonti, Marina ;  Forest Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
Fonti, Patrick ;  Forest Dynamics, Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland
Grossiord, Charlotte ;  Plant Ecology Research Laboratory PERL, School for Architecture, Civil and Environmental Engineering, EPFL, CH-1015, Lausanna, Switzerland ; Community Ecology Unit, Swiss Federal Institute for Forest, Snow and Landscape WSL, CH-1015, Lausanne, Switzerland
Gharun, Mana ;  Department of Environmental Systems Science, ETH Zurich, Universitatstrasse 2, CH-8092, Zurich, Switzerland ; Department of Geosciences, University of Münster, Heisenbergstrasse 2, 48149, Münster, Germany
Buchmann, Nina ;  Department of Environmental Systems Science, ETH Zurich, Universitatstrasse 2, CH-8092, Zurich, Switzerland
Steger, David N ;  Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
Kahmen, Ansgar ;  Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, CH-4056, Basel, Switzerland
More authors (5 more) Less
Language :
English
Title :
Daytime stomatal regulation in mature temperate trees prioritizes stem rehydration at night.
Publication date :
July 2023
Journal title :
New Phytologist
ISSN :
0028-646X
eISSN :
1469-8137
Publisher :
John Wiley and Sons Inc, England
Volume :
239
Issue :
2
Pages :
533 - 546
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
SNF - Schweizerischer Nationalfonds zur Förderung der wissenschaftlichen Forschung
Funding text :
RLP acknowledges the support of the Swiss National Science Foundation (SNSF), Grant P2BSP3_184475. MG acknowledges funding by Swiss National Science Foundation Project ICOS-CH Phase 3 20FI20_198227. FB acknowledges funding from the project ‘Inside out’ (#POIR.04.04.00-00-5F85/18-00) funded by the HOMING programme of the Foundation for Polish Science co-financed by the European Union under the European Regional Development Fund. LD acknowledges the support provided by the Department of Environmental Sciences at the University of Basel and the Swiss Federal Office for the Environment (FOEN). RP acknowledges support by the grant RTI2018-095297-J-I00 (Spain). CG acknowledges funding by the Swiss National Science Foundation (310030_204697). We would also like to thank three anonymous reviewers for their generous time in providing detailed comments and suggestions, which helped us to improve the presented research.RLP acknowledges the support of the Swiss National Science Foundation (SNSF), Grant P2BSP3_184475. MG acknowledges funding by Swiss National Science Foundation Project ICOS‐CH Phase 3 20FI20_198227. FB acknowledges funding from the project ‘Inside out’ (#POIR.04.04.00‐00‐5F85/18‐00) funded by the HOMING programme of the Foundation for Polish Science co‐financed by the European Union under the European Regional Development Fund. LD acknowledges the support provided by the Department of Environmental Sciences at the University of Basel and the Swiss Federal Office for the Environment (FOEN). RP acknowledges support by the grant RTI2018‐095297‐J‐I00 (Spain). CG acknowledges funding by the Swiss National Science Foundation (310030_204697). We would also like to thank three anonymous reviewers for their generous time in providing detailed comments and suggestions, which helped us to improve the presented research.
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