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Gombos M, Hapek N, Kozma-Bognár L, Grezal G, Zombori Z, Kiss E, Györgyey J. Limited water stress modulates expression of circadian clock genes in Brachypodium distachyon roots. Sci Rep 2023; 13:1241. [PMID: 36690685 PMCID: PMC9870971 DOI: 10.1038/s41598-022-27287-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 12/29/2022] [Indexed: 01/24/2023] Open
Abstract
Organisms have evolved a circadian clock for the precise timing of their biological processes. Studies primarily on model dicots have shown the complexity of the inner timekeeper responsible for maintaining circadian oscillation in plants and have highlighted that circadian regulation is more than relevant to a wide range of biological processes, especially organ development and timing of flowering. Contribution of the circadian clock to overall plant fitness and yield has also long been known. Nevertheless, the organ- and species-specific functions of the circadian clock and its relation to stress adaptation have only recently been identified. Here we report transcriptional changes of core clock genes of the model monocot Brachypodium distachyon under three different light regimes (18:6 light:dark, 24:0 light and 0:24 dark) in response to mild drought stress in roots and green plant parts. Comparative monitoring of core clock gene expression in roots and green plant parts has shown that both phase and amplitude of expression in the roots of Brachypodium plants differ markedly from those in the green plant parts, even under well-watered conditions. Moreover, circadian clock genes responded to water depletion differently in root and shoot. These results suggest an organ-specific form and functions of the circadian clock in Brachypodium roots.
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Affiliation(s)
- Magdolna Gombos
- Institute of Plant Biology, BRC-Biological Research Centre, Szeged, Hungary
| | - Nóra Hapek
- Institute of Plant Biology, BRC-Biological Research Centre, Szeged, Hungary
- Institute of Biochemistry, BRC-Biological Research Centre, Szeged, Hungary
| | - László Kozma-Bognár
- Institute of Plant Biology, BRC-Biological Research Centre, Szeged, Hungary
- Department of Genetics, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
| | - Gábor Grezal
- Institute of Biochemistry, BRC-Biological Research Centre, Szeged, Hungary
| | - Zoltán Zombori
- Institute of Plant Biology, BRC-Biological Research Centre, Szeged, Hungary
| | - Edina Kiss
- Institute of Plant Biology, BRC-Biological Research Centre, Szeged, Hungary
| | - János Györgyey
- Institute of Plant Biology, BRC-Biological Research Centre, Szeged, Hungary.
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Resco de Dios V, Anderegg WR, 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 (BASEL, SWITZERLAND) 2020; 9:E1091. [PMID: 32854373 PMCID: PMC7570086 DOI: 10.3390/plants9091091] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 08/13/2020] [Accepted: 08/21/2020] [Indexed: 02/05/2023]
Abstract
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.
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Affiliation(s)
- Víctor Resco de Dios
- 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
| | | | - Ximeng Li
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW 2751, Australia; (X.L.); (D.T.T.); (R.H.N.)
| | - David T. Tissue
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW 2751, Australia; (X.L.); (D.T.T.); (R.H.N.)
| | - Michael Bahn
- Department of Ecology, University of Innsbruck, 6020 Innsbruck, Austria;
| | - Damien Landais
- Ecotron Européen de Montpellier, CNRS, 34980 Montferrier-sur-Lez, France; (D.L.); (A.M.); (J.R.)
| | - Alexandru Milcu
- Ecotron Européen de Montpellier, CNRS, 34980 Montferrier-sur-Lez, France; (D.L.); (A.M.); (J.R.)
- Centre d’Ecologie Fonctionnelle et Evolutive (CEFE), CNRS, UMR 5175, Université de Montpellier, Université Paul Valéry, EPHE, IRD, 34293 Montpellier, France
| | - Yinan Yao
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China;
| | - Rachael H. Nolan
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW 2751, Australia; (X.L.); (D.T.T.); (R.H.N.)
| | - Jacques Roy
- Ecotron Européen de Montpellier, CNRS, 34980 Montferrier-sur-Lez, France; (D.L.); (A.M.); (J.R.)
| | - Arthur Gessler
- Forest Dynamics, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, 8903 Birmensdorf, Switzerland;
- Institute of Terrestrial Ecosystems, ETH Zurich, 8092 Zurich, Switzerland
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