dc.contributor.author | Fernández Marín, Beatriz | |
dc.contributor.author | Atherton, Jon | |
dc.contributor.author | Olascoaga, Beñat | |
dc.contributor.author | Kolari, Pasi | |
dc.contributor.author | Porcar Castell, Albert | |
dc.contributor.author | García Plazaola, José Ignacio | |
dc.date.accessioned | 2018-10-26T18:08:51Z | |
dc.date.available | 2018-10-26T18:08:51Z | |
dc.date.issued | 2018-02-02 | |
dc.identifier.citation | Trees 32(2) : 615–630(2018) | es_ES |
dc.identifier.issn | 0931-1890 | |
dc.identifier.uri | http://hdl.handle.net/10810/29331 | |
dc.description.abstract | 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. | es_ES |
dc.description.sponsorship | 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 (490116). | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | Springer | es_ES |
dc.relation | info:eu-repo/grantAgreement/MINECO/CTM2014-53902-C2-2-P | es_ES |
dc.rights | info:eu-repo/semantics/openAccess | es_ES |
dc.subject | arctic | es_ES |
dc.subject | carotenoid | es_ES |
dc.subject | chlorophyll | es_ES |
dc.subject | circadian rhythm | es_ES |
dc.subject | photochemical efficiency | es_ES |
dc.subject | xanthophyll cycle | es_ES |
dc.title | When the sun never sets: daily changes in pigment composition in three subarctic woody plants during the summer solstice | es_ES |
dc.type | info:eu-repo/semantics/preprint | es_ES |
dc.rights.holder | © Springer-Verlag GmbH Germany, part of Springer Nature 2018 | es_ES |
dc.relation.publisherversion | https://link.springer.com/article/10.1007/s00468-018-1660-9 | es_ES |
dc.departamentoes | Biología vegetal y ecología | es_ES |
dc.departamentoeu | Landaren biologia eta ekologia | es_ES |