When the sun never sets: daily changes in pigment composition in three subarctic woody plants during the summer solstice
Composition and content of photosynthetic pigments is finely tuned by plants according to a subtle equilibrium between the absorbed and used energy by the photosynthetic apparatus. Subarctic and Arctic plants are subjected to extended periods of continuous light during summer. This condition represe...
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ftunivpaisvasco:oai:addi.ehu.eus:10810/29331 2023-10-01T03:53:57+02:00 When the sun never sets: daily changes in pigment composition in three subarctic woody plants during the summer solstice Fernández Marín, Beatriz Atherton, Jon Olascoaga, Beñat Kolari, Pasi Porcar Castell, Albert García Plazaola, José Ignacio 2018-02-02 application/pdf http://hdl.handle.net/10810/29331 eng eng Springer info:eu-repo/grantAgreement/MINECO/CTM2014-53902-C2-2-P https://link.springer.com/article/10.1007/s00468-018-1660-9 Trees 32(2) : 615–630(2018) 0931-1890 http://hdl.handle.net/10810/29331 info:eu-repo/semantics/openAccess © Springer-Verlag GmbH Germany, part of Springer Nature 2018 arctic carotenoid chlorophyll circadian rhythm photochemical efficiency xanthophyll cycle info:eu-repo/semantics/preprint 2018 ftunivpaisvasco 2023-09-05T23:22:54Z Composition and content of photosynthetic pigments is finely tuned by plants according to a subtle equilibrium between the absorbed and used energy by the photosynthetic apparatus. Subarctic and Arctic plants are subjected to extended periods of continuous light during summer. This condition represents a unique natural scenario to study the influence of light on pigment regulation and the presence of diurnal patterns potentially governed by circadian rhythms. Here, we exam- ined the modulation of the photosynthetic apparatus in three naturally co-occurring woody species: mountain birch (Betula pubescens ssp. czerepanovii), alpine bearberry (Arctostaphylos alpina) and Scots pine (Pinus sylvestris) around the sum- mer solstice, at 67 °N latitude. Plants were continuously exposed to solar radiation during the 3-day study period, although PPFD fluctuated, being lower during night-times. Photochemical efficiencies for a given PPFD were similar during daytime and night-time for the three species. In Scots pine, for a given PPFD, net assimilation was slightly higher during daytime than during night-time. Overall, the dynamism in pigment content was mainly driven by PPFD, and was generally unrelated to day/night cycles. Weak indications of potential circadian regulation were found over a few pigments only. Interestingly, the xanthophyll cycle was active at any time of the day in the three species but its responsiveness to PPFD was exacerbated during night-times. This was particularly evident for bearberry, which maintained a highly de-epoxidised state even at night- times. The results could indicate an incomplete acclimation to a 24-h photoperiod for these species, which have colonised subarctic latitudes only recently. Basque Government (UPV/EHU IT-1018-16); Spanish Ministry of Economy and Competitiveness (MINECO) and the ERDF (FEDER) (CTM2014-53902-C2-2-P) to JIGP and BFM; and “Juan de la Cierva-Incorporation” Fellowship IJCI-2014-22489 to BFM; Finnish Academy (272041 and 293443); Funds of the University of Helsinki ... Report Arctic Subarctic ADDI: Repositorio Institucional de la Universidad del País Vasco (UPV) Arctic Cierva ENVELOPE(-60.873,-60.873,-64.156,-64.156) |
institution |
Open Polar |
collection |
ADDI: Repositorio Institucional de la Universidad del País Vasco (UPV) |
op_collection_id |
ftunivpaisvasco |
language |
English |
topic |
arctic carotenoid chlorophyll circadian rhythm photochemical efficiency xanthophyll cycle |
spellingShingle |
arctic carotenoid chlorophyll circadian rhythm photochemical efficiency xanthophyll cycle Fernández Marín, Beatriz Atherton, Jon Olascoaga, Beñat Kolari, Pasi Porcar Castell, Albert García Plazaola, José Ignacio When the sun never sets: daily changes in pigment composition in three subarctic woody plants during the summer solstice |
topic_facet |
arctic carotenoid chlorophyll circadian rhythm photochemical efficiency xanthophyll cycle |
description |
Composition and content of photosynthetic pigments is finely tuned by plants according to a subtle equilibrium between the absorbed and used energy by the photosynthetic apparatus. Subarctic and Arctic plants are subjected to extended periods of continuous light during summer. This condition represents a unique natural scenario to study the influence of light on pigment regulation and the presence of diurnal patterns potentially governed by circadian rhythms. Here, we exam- ined the modulation of the photosynthetic apparatus in three naturally co-occurring woody species: mountain birch (Betula pubescens ssp. czerepanovii), alpine bearberry (Arctostaphylos alpina) and Scots pine (Pinus sylvestris) around the sum- mer solstice, at 67 °N latitude. Plants were continuously exposed to solar radiation during the 3-day study period, although PPFD fluctuated, being lower during night-times. Photochemical efficiencies for a given PPFD were similar during daytime and night-time for the three species. In Scots pine, for a given PPFD, net assimilation was slightly higher during daytime than during night-time. Overall, the dynamism in pigment content was mainly driven by PPFD, and was generally unrelated to day/night cycles. Weak indications of potential circadian regulation were found over a few pigments only. Interestingly, the xanthophyll cycle was active at any time of the day in the three species but its responsiveness to PPFD was exacerbated during night-times. This was particularly evident for bearberry, which maintained a highly de-epoxidised state even at night- times. The results could indicate an incomplete acclimation to a 24-h photoperiod for these species, which have colonised subarctic latitudes only recently. Basque Government (UPV/EHU IT-1018-16); Spanish Ministry of Economy and Competitiveness (MINECO) and the ERDF (FEDER) (CTM2014-53902-C2-2-P) to JIGP and BFM; and “Juan de la Cierva-Incorporation” Fellowship IJCI-2014-22489 to BFM; Finnish Academy (272041 and 293443); Funds of the University of Helsinki ... |
format |
Report |
author |
Fernández Marín, Beatriz Atherton, Jon Olascoaga, Beñat Kolari, Pasi Porcar Castell, Albert García Plazaola, José Ignacio |
author_facet |
Fernández Marín, Beatriz Atherton, Jon Olascoaga, Beñat Kolari, Pasi Porcar Castell, Albert García Plazaola, José Ignacio |
author_sort |
Fernández Marín, Beatriz |
title |
When the sun never sets: daily changes in pigment composition in three subarctic woody plants during the summer solstice |
title_short |
When the sun never sets: daily changes in pigment composition in three subarctic woody plants during the summer solstice |
title_full |
When the sun never sets: daily changes in pigment composition in three subarctic woody plants during the summer solstice |
title_fullStr |
When the sun never sets: daily changes in pigment composition in three subarctic woody plants during the summer solstice |
title_full_unstemmed |
When the sun never sets: daily changes in pigment composition in three subarctic woody plants during the summer solstice |
title_sort |
when the sun never sets: daily changes in pigment composition in three subarctic woody plants during the summer solstice |
publisher |
Springer |
publishDate |
2018 |
url |
http://hdl.handle.net/10810/29331 |
long_lat |
ENVELOPE(-60.873,-60.873,-64.156,-64.156) |
geographic |
Arctic Cierva |
geographic_facet |
Arctic Cierva |
genre |
Arctic Subarctic |
genre_facet |
Arctic Subarctic |
op_relation |
info:eu-repo/grantAgreement/MINECO/CTM2014-53902-C2-2-P https://link.springer.com/article/10.1007/s00468-018-1660-9 Trees 32(2) : 615–630(2018) 0931-1890 http://hdl.handle.net/10810/29331 |
op_rights |
info:eu-repo/semantics/openAccess © Springer-Verlag GmbH Germany, part of Springer Nature 2018 |
_version_ |
1778521069927268352 |