Circadian rhythms have significant effects on leaf-to-canopy scale gas exchange under field conditions

Victor Resco de Dios; Arthur Gessler; Juan Pedro Ferrio; Josu G. Alday; Michael Bahn; Jorge del Castillo; Sebastien Devidal; David T. Tissue; Mark G. Tjoelker; null [and eleven others]

doi:10.1186/s13742-016-0149-y

Circadian rhythms have significant effects on leaf-to-canopy scale gas exchange under field conditions

Victor Resco de Dios, Arthur Gessler, Juan Pedro Ferrio, Josu G. Alday, Michael Bahn, Jorge del Castillo, Sebastien Devidal, David T. Tissue, Mark G. Tjoelker, [and eleven others]

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

Abstract

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. Circadian controls act as a 'memory' of the past conditions experienced by the plant, which synchronizes metabolism across entire plant canopies.

Original language	English
Article number	43
Pages (from-to)	43
Number of pages	10
Journal	GigaScience
Volume	5
Issue number	1
DOIs	https://doi.org/10.1186/s13742-016-0149-y
Publication status	Published - 20 Oct 2016

Open Access - Access Right Statement

© 2016 The Author(s). Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Keywords

circadian rhythms
gas exchange in plants
photosynthesis
stomatal conductance
transpiration

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10.1186/s13742-016-0149-y

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Cite this

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title = "Circadian rhythms have significant effects on leaf-to-canopy scale gas exchange under field conditions",

abstract = "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. Circadian controls act as a 'memory' of the past conditions experienced by the plant, which synchronizes metabolism across entire plant canopies.",

keywords = "circadian rhythms, gas exchange in plants, photosynthesis, stomatal conductance, transpiration",

author = "{Resco de Dios}, Victor and Arthur Gessler and Ferrio, {Juan Pedro} and Alday, {Josu G.} and Michael Bahn and Castillo, {Jorge del} and Sebastien Devidal and Tissue, {David T.} and Tjoelker, {Mark G.} and {[and eleven others]}",

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AU - Gessler, Arthur

AU - Ferrio, Juan Pedro

AU - Alday, Josu G.

AU - Bahn, Michael

AU - Castillo, Jorge del

AU - Devidal, Sebastien

AU - Tissue, David T.

AU - Tjoelker, Mark G.

AU - [and eleven others], null

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Y1 - 2016/10/20

N2 - 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. Circadian controls act as a 'memory' of the past conditions experienced by the plant, which synchronizes metabolism across entire plant canopies.

AB - 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. Circadian controls act as a 'memory' of the past conditions experienced by the plant, which synchronizes metabolism across entire plant canopies.

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KW - photosynthesis

KW - stomatal conductance

KW - transpiration

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Circadian rhythms have significant effects on leaf-to-canopy scale gas exchange under field conditions

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