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Circadian Regulation Does Not Optimize Stomatal Behaviour

School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
Department of Crop and Forest Sciences-AGROTECNIO Center, University of Lleida, 25198 Lleida, Spain
School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA
Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW 2751, Australia
Department of Ecology, University of Innsbruck, 6020 Innsbruck, Austria
Ecotron Européen de Montpellier, CNRS, 34980 Montferrier-sur-Lez, France
Centre d’Ecologie Fonctionnelle et Evolutive (CEFE), CNRS, UMR 5175, Université de Montpellier, Université Paul Valéry, EPHE, IRD, 34293 Montpellier, France
Forest Dynamics, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, 8903 Birmensdorf, Switzerland
Institute of Terrestrial Ecosystems, ETH Zurich, 8092 Zurich, Switzerland
Author to whom correspondence should be addressed.
Plants 2020, 9(9), 1091;
Received: 21 July 2020 / Revised: 13 August 2020 / Accepted: 21 August 2020 / Published: 25 August 2020
The circadian clock is a molecular timer of metabolism that affects the diurnal pattern of stomatal conductance (gs), amongst other processes, in a broad array of plant species. The function of circadian gs regulation remains unknown and here, we test whether circadian regulation helps to optimize diurnal variations in stomatal conductance. We subjected bean (Phaseolus vulgaris) and cotton (Gossypium hirsutum) canopies to fixed, continuous environmental conditions of photosynthetically active radiation, temperature, and vapour pressure deficit (free-running conditions) over 48 h. We modelled gs variations in free-running conditions to test for two possible optimizations of stomatal behaviour under circadian regulation: (i) that stomata operate to maintain constant marginal water use efficiency; or (ii) that stomata maximize C net gain minus the costs or risks of hydraulic damage. We observed that both optimization models predicted gs poorly under free-running conditions, indicating that circadian regulation does not directly lead to stomatal optimization. We also demonstrate that failure to account for circadian variation in gs could potentially lead to biased parameter estimates during calibrations of stomatal models. More broadly, our results add to the emerging field of plant circadian ecology, where circadian controls may partially explain leaf-level patterns observed in the field. View Full-Text
Keywords: adaptations; bean; cotton; ecological strategies; gas exchange; leaf adaptations; bean; cotton; ecological strategies; gas exchange; leaf
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MDPI and ACS Style

Resco de Dios, V.; Anderegg, W.R.L.; Li, X.; Tissue, D.T.; Bahn, M.; Landais, D.; Milcu, A.; Yao, Y.; Nolan, R.H.; Roy, J.; Gessler, A. Circadian Regulation Does Not Optimize Stomatal Behaviour. Plants 2020, 9, 1091.

AMA Style

Resco de Dios V, Anderegg WRL, Li X, Tissue DT, Bahn M, Landais D, Milcu A, Yao Y, Nolan RH, Roy J, Gessler A. Circadian Regulation Does Not Optimize Stomatal Behaviour. Plants. 2020; 9(9):1091.

Chicago/Turabian Style

Resco de Dios, Víctor, William R.L. Anderegg, Ximeng Li, David T. Tissue, Michael Bahn, Damien Landais, Alexandru Milcu, Yinan Yao, Rachael H. Nolan, Jacques Roy, and Arthur Gessler. 2020. "Circadian Regulation Does Not Optimize Stomatal Behaviour" Plants 9, no. 9: 1091.

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