Circadian rhythms have significant effects on leaf-to-canopy scale gas exchange under field conditions
- Univ. de Lleida (Spain). Dept. of Crop and Forest Sciences Agrotecnico Center
- Swiss Federal Inst. for Forest, Snow and Landscape Research, Long-term Forest Ecosystem Research, Birmensdorf (Switzerland); Leibniz Centre for Agricultural Landscape Research, Muncheberg (Germany)
- Univ. de Lleida (Spain). Dept. of Crop and Forest Sciences Agrotecnico Center; Univ. de Concepcion, Concepcion (Chile). Dept. de Botanica
- Univ. de Lleida (Spain). Dept. of Crop and Forest Sciences Agrotecnico Center; Univ. of Liverpool (United Kingdom). School of Environmental Sciences
- Univ. of Innsbruck, Innsbruck (Austria). Inst. of Ecology
- Centre National de la Recherche Scientifique (CNRS), Montferrier-sur-Lez (France). Ecotron Europeen de Montpellier
- Madrid Inst. for Research and Rural Development, Agrarian and Food, Farm 'El Encin', Madrid (Spain)
- Leibniz Centre for Agricultural Landscape Research, Muncheberg (Germany); US Dept. of Agriculture (USDA)., Livermore, CA (United States). Forest Service, Northern Research Station; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Centre National de la Recherche Scientifique (CNRS), Montferrier-sur-Lez (France). Ecotron Europeen de Montpellier; Univ. de Montpellier (France)
- Leibniz Centre for Agricultural Landscape Research, Muncheberg (Germany); Freie Univ., Berlin (Germany). Inst. fur Biologie, Plant Ecology; Berlin-Brandenburg Inst. of Advanced Biodiversity Research, Berlin (Germany)
- Centre National de la Recherche Scientifique (CNRS), Montferrier-sur-Lez (France). Ecotron Europeen de Montpellie
- Univ. de Lleida (Spain). Erasmus Mundus Master on Mediterranean Forestry and Natural Resources Management; Univ. of Canterbury, Christchurch (New Zealand). School of Forestry, College of Engineering
- Western Sydney Univ., Richmond, NSW (Australia). Hawkesbury Inst. for the Environment
Background Molecular clocks drive oscillations in leaf photosynthesis, stomatal conductance, and other cell and leaf-level processes over ~24 h under controlled laboratory conditions. The influence of such circadian regulation over whole-canopy fluxes remains uncertain; diurnal CO2 and H2O vapor flux dynamics in the field are currently interpreted as resulting almost exclusively from direct physiological responses to variations in light, temperature and other environmental factors. We tested whether circadian regulation would affect plant and canopy gas exchange at the Montpellier European Ecotron. Canopy and leaf-level fluxes were constantly monitored under field-like environmental conditions, and under constant environmental conditions (no variation in temperature, radiation, or other environmental cues). Results We show direct experimental evidence at canopy scales of the circadian regulation of daytime gas exchange: 20–79 % of the daily variation range in CO2 and H2O fluxes occurred under circadian entrainment in canopies of an annual herb (bean) and of a perennial shrub (cotton). We also observed that considering circadian regulation improved performance by 8–17 % in commonly used stomatal conductance models. Conclusions Our results show that circadian controls affect diurnal CO2 and H2O flux patterns in entire canopies in field-like conditions, and its consideration significantly improves model performance. Lastly, circadian controls act as a ‘memory’ of the past conditions experienced by the plant, which synchronizes metabolism across entire plant canopies.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1395308
- Journal Information:
- GigaScience, Journal Name: GigaScience Journal Issue: 1 Vol. 5; ISSN 2047-217X
- Publisher:
- BioMed CentralCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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