Night and day - Circadian regulation of night-time dark respiration and light-enhanced dark respiration in plant leaves and canopies

Gessler, Arthur and Roy, Jacques and Kayler, Zachary and Pedro Ferrio, Juan and Alday, Josu G. and Bahn, Michael and del Castillo, Jorge and Devidal, Sebastien and Garcia-Munoz, Sonia and Landais, Damien and Martin-Gomez, Paula and Milcuc, Alexandru and Piel, Clement and Pirhofer-Walzl, Karin and Galiano, Lucia and Schaub, Marcus and Haeni, Matthias and Ravel, Olivier and Salekin, Serajis and Tissue, David T. and Tjoelker, Mark G. and Voltas, Jordi and Hoch, Gunter and Resco de Dios, Victor. (2017) Night and day - Circadian regulation of night-time dark respiration and light-enhanced dark respiration in plant leaves and canopies. Environmental and Experimental Botany, 137. pp. 14-25.

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Official URL: http://edoc.unibas.ch/58689/

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The potential of the vegetation to sequester C is determined by the balance between assimilation and respiration. Respiration is under environmental and substrate-driven control, but the circadian clock might also contribute.To assess circadian control on night-time dark respiration (R-D) and on light enhanced dark respiration (LEDR) - the latter providing information on the metabolic reorganization in the leaf during light-dark transitions - we performed experiments in macrocosms hosting canopies of bean and cotton. Under constant darkness (plus constant air temperature and air humidity), we tested whether circadian regulation of RD scaled from leaf to canopy respiration. Under constant light (plus constant air temperature and air humidity), we assessed the potential for leaf-level circadian regulation of LEDR.There was a clear circadian oscillation of leaf-level RD in both species and circadian patterns scaled to the canopy. LEDR was under circadian control in cotton, but not in bean indicating species-specific controls.The circadian rhythm of LEDR in cotton might indicate variable suppression of the normal cyclic function of the tricarboxylic-acid-cycle in the light. Since circadian regulation is assumed to act as an adaptive memory to adjust plant metabolism based on environmental conditions from previous days, circadian control of RD may help to explain temporal variability of ecosystem respiration.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Physiological Plant Ecology (Kahmen)
UniBasel Contributors:Hoch, G√ľnter
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:04 Jun 2018 07:00
Deposited On:04 Jun 2018 07:00

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