Endogenous circadian rhythms in pigment composition induce changes in photochemical efficiency in plant canopies.
Identifieur interne : 000D31 ( Main/Exploration ); précédent : 000D30; suivant : 000D32Endogenous circadian rhythms in pigment composition induce changes in photochemical efficiency in plant canopies.
Auteurs : José Ignacio García-Plazaola [Espagne] ; Beatriz Fernández-Marín [Espagne] ; Juan Pedro Ferrio [Espagne] ; Josu G. Alday [Espagne] ; Günter Hoch [Suisse] ; Damien Landais [France] ; Alexandru Milcu [France] ; David T. Tissue [Australie] ; Jordi Voltas [Espagne] ; Arthur Gessler [Suisse] ; Jacques Roy [France] ; Víctor Resco De Dios [Espagne]Source :
- Plant, cell & environment [ 1365-3040 ] ; 2017.
Abstract
There is increasing evidence that the circadian clock is a significant 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 associated with parallel changes in carbohydrate content or xanthophyll cycle activity. We 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 during the entrainment (subjective nights). These oscillations could be attributed to the synthesis and/or degradation of trimeric 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.
DOI: 10.1111/pce.12909
PubMed: 28098350
Affiliations:
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first="José Ignacio" last="García-Plazaola">José Ignacio García-Plazaola</name><affiliation wicri:level="1"><nlm:affiliation>Department of Plant Biology and Ecology, University of the Basque Country (UPV/EHU), 48080, Bilbao, Spain.</nlm:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Department of Plant Biology and Ecology, University of the Basque Country (UPV/EHU), 48080, Bilbao</wicri:regionArea><wicri:noRegion>Bilbao</wicri:noRegion></affiliation></author><author><name sortKey="Fernandez Marin, Beatriz" sort="Fernandez Marin, Beatriz" uniqKey="Fernandez Marin B" first="Beatriz" last="Fernández-Marín">Beatriz Fernández-Marín</name><affiliation wicri:level="1"><nlm:affiliation>Department of Plant Biology and Ecology, University of the Basque Country (UPV/EHU), 48080, Bilbao, Spain.</nlm:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Department of Plant Biology and Ecology, University of the Basque Country (UPV/EHU), 48080, 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Alday</name><affiliation wicri:level="1"><nlm:affiliation>Department of Crop and Forest Sciences-AGROTECNIO Center, Universitat de Lleida, 25198, Lleida, Spain.</nlm:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Department of Crop and Forest Sciences-AGROTECNIO Center, Universitat de Lleida, 25198, Lleida</wicri:regionArea><wicri:noRegion>Lleida</wicri:noRegion></affiliation></author><author><name sortKey="Hoch, Gunter" sort="Hoch, Gunter" uniqKey="Hoch G" first="Günter" last="Hoch">Günter Hoch</name><affiliation wicri:level="1"><nlm:affiliation>Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, 4056, Basel, Switzerland.</nlm:affiliation><country xml:lang="fr">Suisse</country><wicri:regionArea>Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, 4056, Basel</wicri:regionArea><wicri:noRegion>Basel</wicri:noRegion></affiliation></author><author><name sortKey="Landais, Damien" sort="Landais, Damien" uniqKey="Landais D" first="Damien" last="Landais">Damien Landais</name><affiliation wicri:level="1"><nlm:affiliation>Ecotron Européen de Montpellier, CNRS, UPS-3248, Montferrier-sur-Lez, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Ecotron Européen de Montpellier, CNRS, UPS-3248, Montferrier-sur-Lez</wicri:regionArea><wicri:noRegion>Montferrier-sur-Lez</wicri:noRegion><wicri:noRegion>Montferrier-sur-Lez</wicri:noRegion></affiliation></author><author><name sortKey="Milcu, Alexandru" sort="Milcu, Alexandru" uniqKey="Milcu A" first="Alexandru" last="Milcu">Alexandru Milcu</name><affiliation wicri:level="1"><nlm:affiliation>Ecotron Européen de Montpellier, CNRS, UPS-3248, Montferrier-sur-Lez, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Ecotron Européen de Montpellier, CNRS, UPS-3248, Montferrier-sur-Lez</wicri:regionArea><wicri:noRegion>Montferrier-sur-Lez</wicri:noRegion><wicri:noRegion>Montferrier-sur-Lez</wicri:noRegion></affiliation></author><author><name sortKey="Tissue, David T" sort="Tissue, David T" uniqKey="Tissue D" first="David T" last="Tissue">David T. Tissue</name><affiliation wicri:level="1"><nlm:affiliation>Hawkesbury Institute for the Environment, Western Sydney University, Richmond, 2753, New South Wales, Australia.</nlm:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Hawkesbury Institute for the Environment, Western Sydney University, Richmond, 2753, New South Wales</wicri:regionArea><wicri:noRegion>New South Wales</wicri:noRegion></affiliation></author><author><name sortKey="Voltas, Jordi" sort="Voltas, Jordi" uniqKey="Voltas J" first="Jordi" last="Voltas">Jordi Voltas</name><affiliation wicri:level="1"><nlm:affiliation>Department of Crop and Forest Sciences-AGROTECNIO Center, Universitat de Lleida, 25198, Lleida, Spain.</nlm:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Department of Crop and Forest Sciences-AGROTECNIO Center, Universitat de Lleida, 25198, Lleida</wicri:regionArea><wicri:noRegion>Lleida</wicri:noRegion></affiliation></author><author><name sortKey="Gessler, Arthur" sort="Gessler, Arthur" uniqKey="Gessler A" first="Arthur" last="Gessler">Arthur Gessler</name><affiliation wicri:level="1"><nlm:affiliation>Swiss Federal Institute for Forest, Snow and Landscape Research, 8903, Birmensdorf, Switzerland.</nlm:affiliation><country xml:lang="fr">Suisse</country><wicri:regionArea>Swiss Federal Institute for Forest, Snow and Landscape Research, 8903, Birmensdorf</wicri:regionArea><wicri:noRegion>Birmensdorf</wicri:noRegion></affiliation></author><author><name sortKey="Roy, Jacques" sort="Roy, Jacques" uniqKey="Roy J" first="Jacques" last="Roy">Jacques Roy</name><affiliation wicri:level="1"><nlm:affiliation>Ecotron Européen de Montpellier, CNRS, UPS-3248, Montferrier-sur-Lez, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Ecotron Européen de Montpellier, CNRS, UPS-3248, Montferrier-sur-Lez</wicri:regionArea><wicri:noRegion>Montferrier-sur-Lez</wicri:noRegion><wicri:noRegion>Montferrier-sur-Lez</wicri:noRegion></affiliation></author><author><name sortKey="Resco De Dios, Victor" sort="Resco De Dios, Victor" uniqKey="Resco De Dios V" first="Víctor" last="Resco De Dios">Víctor Resco De Dios</name><affiliation wicri:level="1"><nlm:affiliation>Department of Crop and Forest Sciences-AGROTECNIO Center, Universitat de Lleida, 25198, Lleida, Spain.</nlm:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Department of Crop and Forest Sciences-AGROTECNIO Center, Universitat de Lleida, 25198, Lleida</wicri:regionArea><wicri:noRegion>Lleida</wicri:noRegion></affiliation></author></analytic><series><title level="j">Plant, cell & environment</title><idno type="eISSN">1365-3040</idno><imprint><date when="2017" type="published">2017</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">There is increasing evidence that the circadian clock is a significant 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 associated with parallel changes in carbohydrate content or xanthophyll cycle activity. We 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 during the entrainment (subjective nights). These oscillations could be attributed to the synthesis and/or degradation of trimeric 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.</div></front></TEI><affiliations><list><country><li>Australie</li><li>Espagne</li><li>France</li><li>Suisse</li></country></list><tree><country name="Espagne"><noRegion><name sortKey="Garcia Plazaola, Jose Ignacio" sort="Garcia Plazaola, Jose Ignacio" uniqKey="Garcia Plazaola J" first="José Ignacio" last="García-Plazaola">José Ignacio García-Plazaola</name></noRegion><name sortKey="Alday, Josu G" sort="Alday, Josu G" uniqKey="Alday J" first="Josu G" last="Alday">Josu G. Alday</name><name sortKey="Fernandez Marin, Beatriz" sort="Fernandez Marin, Beatriz" uniqKey="Fernandez Marin B" first="Beatriz" last="Fernández-Marín">Beatriz Fernández-Marín</name><name sortKey="Ferrio, Juan Pedro" sort="Ferrio, Juan Pedro" uniqKey="Ferrio J" first="Juan Pedro" last="Ferrio">Juan Pedro Ferrio</name><name sortKey="Resco De Dios, Victor" sort="Resco De Dios, Victor" uniqKey="Resco De Dios V" first="Víctor" last="Resco De Dios">Víctor Resco De Dios</name><name sortKey="Voltas, Jordi" sort="Voltas, Jordi" uniqKey="Voltas J" first="Jordi" last="Voltas">Jordi Voltas</name></country><country name="Suisse"><noRegion><name sortKey="Hoch, Gunter" sort="Hoch, Gunter" uniqKey="Hoch G" first="Günter" last="Hoch">Günter Hoch</name></noRegion><name sortKey="Gessler, Arthur" sort="Gessler, Arthur" uniqKey="Gessler A" first="Arthur" last="Gessler">Arthur Gessler</name></country><country name="France"><noRegion><name sortKey="Landais, Damien" sort="Landais, Damien" uniqKey="Landais D" first="Damien" last="Landais">Damien Landais</name></noRegion><name sortKey="Milcu, Alexandru" sort="Milcu, Alexandru" uniqKey="Milcu A" first="Alexandru" last="Milcu">Alexandru Milcu</name><name sortKey="Roy, Jacques" sort="Roy, Jacques" uniqKey="Roy J" first="Jacques" last="Roy">Jacques Roy</name></country><country name="Australie"><noRegion><name sortKey="Tissue, David T" sort="Tissue, David T" uniqKey="Tissue D" first="David T" last="Tissue">David T. 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