Xanthophyll cycles in the juniper haircap moss (Polytrichum juniperinum) and Antarctic hair grass (Deschampsia antarctica) on Livingston Island (South Shetland Islands, Maritime Antarctica)
The summer climate in Maritime Antarctica is characterised by high humidity and cloudiness with slightly above zero temperatures. Under such conditions, photosynthetic activity is temperature-limited and plant communities are formed by a few species. These conditions could prevent the operation of t...
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ftunivpaisvasco:oai:addi.ehu.eus:10810/57938 2023-05-15T13:56:39+02:00 Xanthophyll cycles in the juniper haircap moss (Polytrichum juniperinum) and Antarctic hair grass (Deschampsia antarctica) on Livingston Island (South Shetland Islands, Maritime Antarctica) García Plazaola, José Ignacio López Pozo, Marina Fernández Marín, Beatriz 2022 http://hdl.handle.net/10810/57938 https://doi.org/10.1007/s00300-022-03068-7 eng eng Springer info:eu-repo/grantAgreement/MINECO/CTM2014-53902-C2-2-P info:eu-repo/grantAgreement/MICIU/PGC2018-093824-B-C44 https://link.springer.com/article/10.1007/s00300-022-03068-7 Polar Biology 45 : 1247-1256 (2022) 0722-4060 1432-2056 http://hdl.handle.net/10810/57938 doi:10.1007/s00300-022-03068-7 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/3.0/es/ © The Author(s) 2022. This article is licensed under a Creative Commons Attri- bution 4.0 International License, which permits use, sharing, adapta- tion, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. Atribución 3.0 España CC-BY Deschampsia antarctica Polytrichum juniperinum Photochemical efficiency Violaxanthin Zeaxanthin info:eu-repo/semantics/article 2022 ftunivpaisvasco https://doi.org/10.1007/s00300-022-03068-7 2022-10-11T23:20:32Z The summer climate in Maritime Antarctica is characterised by high humidity and cloudiness with slightly above zero temperatures. Under such conditions, photosynthetic activity is temperature-limited and plant communities are formed by a few species. These conditions could prevent the operation of the photoprotective xanthophyll (VAZ) cycle as low irradiance reduces the excess of energy and low temperatures limit enzyme activity. The VAZ cycle regulates the dissipation of the excess of absorbed light as heat, which is the main mechanism of photoprotection in plants. To test whether this mechanism operates dynamically in Antarctic plant communities, we characterised pigment dynamics under natural field conditions in two representative species: the moss Polytrichum juniperinum and the grass Deschampsia antarctica. Pigment analyses revealed that the total VAZ pool was in the upper range of the values reported for most plant species, suggesting that they are exposed to a high degree of environmental stress. Despite cloudiness, there was a strong conversion of violaxanthin (V) to zeaxanthin (Z) during daytime. Conversely, the dark-induced enzymatic epoxidation back to V was not limited by nocturnal temperatures. In contrast with plants from other cold ecosystems, we did not find any evidence of overnight retention of Z or sustained reductions in photochemical efficiency. These results are of interest for modelling, remote sensing and upscaling of the responses of Antarctic vegetation to environmental challenges. The Spanish Ministry of Science, Innovation and Universities (MICIU/FEDER, EU) and the Basque Government funded this research through the projects CTM2014-53902-C2-2-P, PGC2018-093824-B-C44 and UPV/EHU IT-1018-16. Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. Article in Journal/Newspaper Antarc* Antarctic Antarctica Livingston Island Polar Biology South Shetland Islands ADDI: Repositorio Institucional de la Universidad del País Vasco (UPV) Antarctic Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) South Shetland Islands Polar Biology 45 7 1247 1256 |
institution |
Open Polar |
collection |
ADDI: Repositorio Institucional de la Universidad del País Vasco (UPV) |
op_collection_id |
ftunivpaisvasco |
language |
English |
topic |
Deschampsia antarctica Polytrichum juniperinum Photochemical efficiency Violaxanthin Zeaxanthin |
spellingShingle |
Deschampsia antarctica Polytrichum juniperinum Photochemical efficiency Violaxanthin Zeaxanthin García Plazaola, José Ignacio López Pozo, Marina Fernández Marín, Beatriz Xanthophyll cycles in the juniper haircap moss (Polytrichum juniperinum) and Antarctic hair grass (Deschampsia antarctica) on Livingston Island (South Shetland Islands, Maritime Antarctica) |
topic_facet |
Deschampsia antarctica Polytrichum juniperinum Photochemical efficiency Violaxanthin Zeaxanthin |
description |
The summer climate in Maritime Antarctica is characterised by high humidity and cloudiness with slightly above zero temperatures. Under such conditions, photosynthetic activity is temperature-limited and plant communities are formed by a few species. These conditions could prevent the operation of the photoprotective xanthophyll (VAZ) cycle as low irradiance reduces the excess of energy and low temperatures limit enzyme activity. The VAZ cycle regulates the dissipation of the excess of absorbed light as heat, which is the main mechanism of photoprotection in plants. To test whether this mechanism operates dynamically in Antarctic plant communities, we characterised pigment dynamics under natural field conditions in two representative species: the moss Polytrichum juniperinum and the grass Deschampsia antarctica. Pigment analyses revealed that the total VAZ pool was in the upper range of the values reported for most plant species, suggesting that they are exposed to a high degree of environmental stress. Despite cloudiness, there was a strong conversion of violaxanthin (V) to zeaxanthin (Z) during daytime. Conversely, the dark-induced enzymatic epoxidation back to V was not limited by nocturnal temperatures. In contrast with plants from other cold ecosystems, we did not find any evidence of overnight retention of Z or sustained reductions in photochemical efficiency. These results are of interest for modelling, remote sensing and upscaling of the responses of Antarctic vegetation to environmental challenges. The Spanish Ministry of Science, Innovation and Universities (MICIU/FEDER, EU) and the Basque Government funded this research through the projects CTM2014-53902-C2-2-P, PGC2018-093824-B-C44 and UPV/EHU IT-1018-16. Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. |
format |
Article in Journal/Newspaper |
author |
García Plazaola, José Ignacio López Pozo, Marina Fernández Marín, Beatriz |
author_facet |
García Plazaola, José Ignacio López Pozo, Marina Fernández Marín, Beatriz |
author_sort |
García Plazaola, José Ignacio |
title |
Xanthophyll cycles in the juniper haircap moss (Polytrichum juniperinum) and Antarctic hair grass (Deschampsia antarctica) on Livingston Island (South Shetland Islands, Maritime Antarctica) |
title_short |
Xanthophyll cycles in the juniper haircap moss (Polytrichum juniperinum) and Antarctic hair grass (Deschampsia antarctica) on Livingston Island (South Shetland Islands, Maritime Antarctica) |
title_full |
Xanthophyll cycles in the juniper haircap moss (Polytrichum juniperinum) and Antarctic hair grass (Deschampsia antarctica) on Livingston Island (South Shetland Islands, Maritime Antarctica) |
title_fullStr |
Xanthophyll cycles in the juniper haircap moss (Polytrichum juniperinum) and Antarctic hair grass (Deschampsia antarctica) on Livingston Island (South Shetland Islands, Maritime Antarctica) |
title_full_unstemmed |
Xanthophyll cycles in the juniper haircap moss (Polytrichum juniperinum) and Antarctic hair grass (Deschampsia antarctica) on Livingston Island (South Shetland Islands, Maritime Antarctica) |
title_sort |
xanthophyll cycles in the juniper haircap moss (polytrichum juniperinum) and antarctic hair grass (deschampsia antarctica) on livingston island (south shetland islands, maritime antarctica) |
publisher |
Springer |
publishDate |
2022 |
url |
http://hdl.handle.net/10810/57938 https://doi.org/10.1007/s00300-022-03068-7 |
long_lat |
ENVELOPE(-60.500,-60.500,-62.600,-62.600) |
geographic |
Antarctic Livingston Island South Shetland Islands |
geographic_facet |
Antarctic Livingston Island South Shetland Islands |
genre |
Antarc* Antarctic Antarctica Livingston Island Polar Biology South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctica Livingston Island Polar Biology South Shetland Islands |
op_relation |
info:eu-repo/grantAgreement/MINECO/CTM2014-53902-C2-2-P info:eu-repo/grantAgreement/MICIU/PGC2018-093824-B-C44 https://link.springer.com/article/10.1007/s00300-022-03068-7 Polar Biology 45 : 1247-1256 (2022) 0722-4060 1432-2056 http://hdl.handle.net/10810/57938 doi:10.1007/s00300-022-03068-7 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/3.0/es/ © The Author(s) 2022. This article is licensed under a Creative Commons Attri- bution 4.0 International License, which permits use, sharing, adapta- tion, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. Atribución 3.0 España |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/s00300-022-03068-7 |
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