Endogenous circadian rhythms in pigment composition induce changes in photochemical efficiency in plant canopies

García-Plazaola, José Ignacio; Fernández-Marín, beatriz; Ferrio Díaz, Juan Pedro; Alday, Josu G.; Hoch, Günter; Landais, Damien; Milcu, Alexandru; Tissue, David T.; Voltas Velasco, Jordi; Gessler, Arthur; Roy, Jacques; Resco de Dios, Víctor

doi:https://doi.org/10.1111/pce.12909

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Issue date

2017-02-01

Author

García-Plazaola, José Ignacio

Fernández-Marín, beatriz

Ferrio Díaz, Juan Pedro

Alday, Josu G.

Hoch, Günter

Landais, Damien

Milcu, Alexandru

Tissue, David T.

Voltas Velasco, Jordi

Gessler, Arthur

Roy, Jacques

Resco de Dios, Víctor

Suggested citation

García-Plazaola, José Ignacio; Fernández-Marín, beatriz; Ferrio Díaz, Juan Pedro; Alday, Josu G.; Hoch, Günter; Landais, Damien; ... Resco de Dios, Víctor. (2017) . Endogenous circadian rhythms in pigment composition induce changes in photochemical efficiency in plant canopies. Plant Cell and Environment, 2017, vol. 40, p. 1153-1162. https://doi.org/10.1111/pce.12909.

Abstract

There is increasing evidence that the circadian clock is a signif- icant driver of photosynthesis that becomes apparent when environmental cues are experimentally held constant. We studied whether the composition of photosynthetic pigments is under circadian regulation, and whether pigment oscillations lead to rhythmic changes in photochemical efﬁciency. To address these questions, we maintained canopies of bean and cotton, after an entrainment phase, under constant (light or darkness) conditions for 30–48 h. Photosynthesis and quantum yield peaked at subjective noon, and non-photochemical quenching peaked at night. These oscillations were not associ- ated with parallel changes in carbohydrate content or xantho- phyll cycle activity. W e observed robust oscillations of Chl a/b during constant light in both species, and also under constant darkness in bean, peaking when it would have been night dur- ing the entrainment (subjective nights). These oscillations could be attributed to the synthesis and/or degradation of tri- meric light-harvesting complex II (reﬂected by the rhythmic changes in Chl a/b), with the antenna size minimal at night and maximal around subjective noon. Considering together the oscillations of pigments and photochemistry, the observed pattern of changes is counterintuitive if we assume that the plant strategy is to avoid photodamage, but consistent with a strategy where non-stressed plants maximize photosynthesis.

URI

http://hdl.handle.net/10459.1/63093

DOI

https://doi.org/10.1111/pce.12909

Is part of

Plant Cell and Environment, 2017, vol. 40, p. 1153-1162