Ambient UV-B radiation reduces PSII performance and net photosynthesis in high Arctic Salix arctica
Ambient ultraviolet-B (UV-B) radiation potentially impacts the photosynthetic performance of high Arctic plants. We conducted an UV-B exclusion experiment in a dwarf shrub heath in NE Greenland (74°N), with open control, filter control, UV-B filtering and UV-AB filtering, all in combination with lea...
Published in: | Environmental and Experimental Botany |
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Language: | English |
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2011
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Online Access: | https://curis.ku.dk/portal/da/publications/ambient-uvb-radiation-reduces-psii-performance-and-net-photosynthesis-in-high-arctic-salix-arctica(da180351-325a-41d8-869c-d8b0fc033ee0).html https://doi.org/10.1016/j.envexpbot.2011.08.003 |
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ftcopenhagenunip:oai:pure.atira.dk:publications/da180351-325a-41d8-869c-d8b0fc033ee0 2024-02-27T08:36:15+00:00 Ambient UV-B radiation reduces PSII performance and net photosynthesis in high Arctic Salix arctica Albert, Kristian R. Mikkelsen, Teis N. Ro-Poulsen, Helge Arndal, Marie F. Michelsen, Anders 2011 https://curis.ku.dk/portal/da/publications/ambient-uvb-radiation-reduces-psii-performance-and-net-photosynthesis-in-high-arctic-salix-arctica(da180351-325a-41d8-869c-d8b0fc033ee0).html https://doi.org/10.1016/j.envexpbot.2011.08.003 eng eng info:eu-repo/semantics/closedAccess Albert , K R , Mikkelsen , T N , Ro-Poulsen , H , Arndal , M F & Michelsen , A 2011 , ' Ambient UV-B radiation reduces PSII performance and net photosynthesis in high Arctic Salix arctica ' , Environmental and Experimental Botany , vol. 73 , pp. 10-18 . https://doi.org/10.1016/j.envexpbot.2011.08.003 JIP test Jmax Photoinhibition Plant stress Stomatal conductance UV-B exclusion Vcmax article 2011 ftcopenhagenunip https://doi.org/10.1016/j.envexpbot.2011.08.003 2024-02-01T00:12:36Z Ambient ultraviolet-B (UV-B) radiation potentially impacts the photosynthetic performance of high Arctic plants. We conducted an UV-B exclusion experiment in a dwarf shrub heath in NE Greenland (74°N), with open control, filter control, UV-B filtering and UV-AB filtering, all in combination with leaf angle control. Two sites with natural leaf positions had ground angles of 0° ('level site') and 45° ('sloping site'), while at a third site the leaves were fixed in an angle of 45° to homogenize the irradiance dose ('fixed leaf angle site'). The photosynthetic performance of the leaves was characterized by simultaneous gas exchange and chlorophyll fluorescence measurements and the PSII performance through the growing season was investigated with fluorescence measurements. Leaf harvest towards the end of the growing season was done to determine the specific leaf area and the content of carbon, nitrogen and UV-B absorbing compounds. Compared to a 60% reduced UV-B irradiance, the ambient solar UV-B reduced net photosynthesis in Salix arctica leaves fixed in the 45° position which exposed leaves to maximum natural irradiance. Also a reduced Calvin Cycle capacity was found, i.e. the maximum rate of electron transport (J max ) and the maximum carboxylation rate of Rubisco (V cmax ), and the PSII performance showed a decreased quantum yield and increased energy dissipation. A parallel response pattern and reduced PSII performance at all three sites indicate that these responses take place in all leaves across position in the vegetation. These findings add to the evidence that the ambient solar UV-B currently is a significant stress factor for plants in high Arctic Greenland. Article in Journal/Newspaper Arctic Arctic Greenland University of Copenhagen: Research Arctic Calvin ENVELOPE(165.100,165.100,-71.283,-71.283) Greenland Environmental and Experimental Botany 73 10 18 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
JIP test Jmax Photoinhibition Plant stress Stomatal conductance UV-B exclusion Vcmax |
spellingShingle |
JIP test Jmax Photoinhibition Plant stress Stomatal conductance UV-B exclusion Vcmax Albert, Kristian R. Mikkelsen, Teis N. Ro-Poulsen, Helge Arndal, Marie F. Michelsen, Anders Ambient UV-B radiation reduces PSII performance and net photosynthesis in high Arctic Salix arctica |
topic_facet |
JIP test Jmax Photoinhibition Plant stress Stomatal conductance UV-B exclusion Vcmax |
description |
Ambient ultraviolet-B (UV-B) radiation potentially impacts the photosynthetic performance of high Arctic plants. We conducted an UV-B exclusion experiment in a dwarf shrub heath in NE Greenland (74°N), with open control, filter control, UV-B filtering and UV-AB filtering, all in combination with leaf angle control. Two sites with natural leaf positions had ground angles of 0° ('level site') and 45° ('sloping site'), while at a third site the leaves were fixed in an angle of 45° to homogenize the irradiance dose ('fixed leaf angle site'). The photosynthetic performance of the leaves was characterized by simultaneous gas exchange and chlorophyll fluorescence measurements and the PSII performance through the growing season was investigated with fluorescence measurements. Leaf harvest towards the end of the growing season was done to determine the specific leaf area and the content of carbon, nitrogen and UV-B absorbing compounds. Compared to a 60% reduced UV-B irradiance, the ambient solar UV-B reduced net photosynthesis in Salix arctica leaves fixed in the 45° position which exposed leaves to maximum natural irradiance. Also a reduced Calvin Cycle capacity was found, i.e. the maximum rate of electron transport (J max ) and the maximum carboxylation rate of Rubisco (V cmax ), and the PSII performance showed a decreased quantum yield and increased energy dissipation. A parallel response pattern and reduced PSII performance at all three sites indicate that these responses take place in all leaves across position in the vegetation. These findings add to the evidence that the ambient solar UV-B currently is a significant stress factor for plants in high Arctic Greenland. |
format |
Article in Journal/Newspaper |
author |
Albert, Kristian R. Mikkelsen, Teis N. Ro-Poulsen, Helge Arndal, Marie F. Michelsen, Anders |
author_facet |
Albert, Kristian R. Mikkelsen, Teis N. Ro-Poulsen, Helge Arndal, Marie F. Michelsen, Anders |
author_sort |
Albert, Kristian R. |
title |
Ambient UV-B radiation reduces PSII performance and net photosynthesis in high Arctic Salix arctica |
title_short |
Ambient UV-B radiation reduces PSII performance and net photosynthesis in high Arctic Salix arctica |
title_full |
Ambient UV-B radiation reduces PSII performance and net photosynthesis in high Arctic Salix arctica |
title_fullStr |
Ambient UV-B radiation reduces PSII performance and net photosynthesis in high Arctic Salix arctica |
title_full_unstemmed |
Ambient UV-B radiation reduces PSII performance and net photosynthesis in high Arctic Salix arctica |
title_sort |
ambient uv-b radiation reduces psii performance and net photosynthesis in high arctic salix arctica |
publishDate |
2011 |
url |
https://curis.ku.dk/portal/da/publications/ambient-uvb-radiation-reduces-psii-performance-and-net-photosynthesis-in-high-arctic-salix-arctica(da180351-325a-41d8-869c-d8b0fc033ee0).html https://doi.org/10.1016/j.envexpbot.2011.08.003 |
long_lat |
ENVELOPE(165.100,165.100,-71.283,-71.283) |
geographic |
Arctic Calvin Greenland |
geographic_facet |
Arctic Calvin Greenland |
genre |
Arctic Arctic Greenland |
genre_facet |
Arctic Arctic Greenland |
op_source |
Albert , K R , Mikkelsen , T N , Ro-Poulsen , H , Arndal , M F & Michelsen , A 2011 , ' Ambient UV-B radiation reduces PSII performance and net photosynthesis in high Arctic Salix arctica ' , Environmental and Experimental Botany , vol. 73 , pp. 10-18 . https://doi.org/10.1016/j.envexpbot.2011.08.003 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.envexpbot.2011.08.003 |
container_title |
Environmental and Experimental Botany |
container_volume |
73 |
container_start_page |
10 |
op_container_end_page |
18 |
_version_ |
1792043237697912832 |