When the sun never sets : daily changes in pigment composition in three subarctic woody plants during the summer solstice
Subarctic plants in summer (subjected to continuous light) showed photosynthetic pigment contents mainly driven by PPFD (unrelated to day/night cycles) and a xanthophyll cycle responsiveness to PPFD exacerbated during night-times. Composition and content of photosynthetic pigments is finely tuned by...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/307678 2024-01-07T09:41:36+01:00 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 I. Department of Forest Sciences Ecosystem processes (INAR Forest Sciences) Institute for Atmospheric and Earth System Research (INAR) Micrometeorology and biogeochemical cycles Forest Ecology and Management 2019-11-29T13:09:01Z 16 application/pdf http://hdl.handle.net/10138/307678 eng eng Springer-Verlag 10.1007/s00468-018-1660-9 Fernández-Marín , B , Atherton , J , Olascoaga , B , Kolari , P , Porcar Castell , A & García-Plazaola , J I 2018 , ' When the sun never sets : daily changes in pigment composition in three subarctic woody plants during the summer solstice ' , Trees : Structure and Function , vol. 32 , no. 2 , pp. 615-630 . https://doi.org/10.1007/s00468-018-1660-9 ORCID: /0000-0002-1976-1040/work/46651196 ORCID: /0000-0001-7271-633X/work/46647142 ORCID: /0000-0002-7670-2928/work/55063492 85044106136 6cd50f63-a344-4b07-aeaf-b64112bac0d4 http://hdl.handle.net/10138/307678 000427709200023 unspecified openAccess info:eu-repo/semantics/openAccess 4112 Forestry Arctic Carotenoid Chlorophyll Circadian rhythm Photochemical efficiency Xanthophyll cycle CIRCADIAN-RHYTHMS VASCULAR PLANTS LIGHT TUNDRA PHOTOSYNTHESIS ENVIRONMENTS CAROTENOIDS PROTECTION EFFICIENCY ZEAXANTHIN Article acceptedVersion 2019 ftunivhelsihelda 2023-12-14T00:02:06Z Subarctic plants in summer (subjected to continuous light) showed photosynthetic pigment contents mainly driven by PPFD (unrelated to day/night cycles) and a xanthophyll cycle responsiveness to PPFD exacerbated during night-times. 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 examined 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 summer solstice, at 67 A degrees 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. Peer reviewed Article in Journal/Newspaper Arctic Subarctic Tundra HELDA – University of Helsinki Open Repository Arctic Trees 32 2 615 630 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
4112 Forestry Arctic Carotenoid Chlorophyll Circadian rhythm Photochemical efficiency Xanthophyll cycle CIRCADIAN-RHYTHMS VASCULAR PLANTS LIGHT TUNDRA PHOTOSYNTHESIS ENVIRONMENTS CAROTENOIDS PROTECTION EFFICIENCY ZEAXANTHIN |
spellingShingle |
4112 Forestry Arctic Carotenoid Chlorophyll Circadian rhythm Photochemical efficiency Xanthophyll cycle CIRCADIAN-RHYTHMS VASCULAR PLANTS LIGHT TUNDRA PHOTOSYNTHESIS ENVIRONMENTS CAROTENOIDS PROTECTION EFFICIENCY ZEAXANTHIN Fernández-Marín, Beatriz Atherton, Jon Olascoaga, Beñat Kolari, Pasi Porcar Castell, Albert García-Plazaola, José I. When the sun never sets : daily changes in pigment composition in three subarctic woody plants during the summer solstice |
topic_facet |
4112 Forestry Arctic Carotenoid Chlorophyll Circadian rhythm Photochemical efficiency Xanthophyll cycle CIRCADIAN-RHYTHMS VASCULAR PLANTS LIGHT TUNDRA PHOTOSYNTHESIS ENVIRONMENTS CAROTENOIDS PROTECTION EFFICIENCY ZEAXANTHIN |
description |
Subarctic plants in summer (subjected to continuous light) showed photosynthetic pigment contents mainly driven by PPFD (unrelated to day/night cycles) and a xanthophyll cycle responsiveness to PPFD exacerbated during night-times. 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 examined 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 summer solstice, at 67 A degrees 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. Peer reviewed |
author2 |
Department of Forest Sciences Ecosystem processes (INAR Forest Sciences) Institute for Atmospheric and Earth System Research (INAR) Micrometeorology and biogeochemical cycles Forest Ecology and Management |
format |
Article in Journal/Newspaper |
author |
Fernández-Marín, Beatriz Atherton, Jon Olascoaga, Beñat Kolari, Pasi Porcar Castell, Albert García-Plazaola, José I. |
author_facet |
Fernández-Marín, Beatriz Atherton, Jon Olascoaga, Beñat Kolari, Pasi Porcar Castell, Albert García-Plazaola, José I. |
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-Verlag |
publishDate |
2019 |
url |
http://hdl.handle.net/10138/307678 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Subarctic Tundra |
genre_facet |
Arctic Subarctic Tundra |
op_relation |
10.1007/s00468-018-1660-9 Fernández-Marín , B , Atherton , J , Olascoaga , B , Kolari , P , Porcar Castell , A & García-Plazaola , J I 2018 , ' When the sun never sets : daily changes in pigment composition in three subarctic woody plants during the summer solstice ' , Trees : Structure and Function , vol. 32 , no. 2 , pp. 615-630 . https://doi.org/10.1007/s00468-018-1660-9 ORCID: /0000-0002-1976-1040/work/46651196 ORCID: /0000-0001-7271-633X/work/46647142 ORCID: /0000-0002-7670-2928/work/55063492 85044106136 6cd50f63-a344-4b07-aeaf-b64112bac0d4 http://hdl.handle.net/10138/307678 000427709200023 |
op_rights |
unspecified openAccess info:eu-repo/semantics/openAccess |
container_title |
Trees |
container_volume |
32 |
container_issue |
2 |
container_start_page |
615 |
op_container_end_page |
630 |
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1787422389630402560 |