Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum
Increasing atmospheric CO 2 concentration is responsible for progressive ocean acidification, ocean warming as well as decreased thickness of upper mixing layer (UML), thus exposing phytoplankton cells not only to lower pH and higher temperatures but also to higher levels of solar UV radiation. In o...
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ftdoajarticles:oai:doaj.org/article:eabe7cb227954d61b04da664a21fb6df 2023-05-15T17:49:44+02:00 Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum E. W. Helbling V. E. Villafañe Y. Li K. Gao 2012-10-01T00:00:00Z https://doi.org/10.5194/bg-9-3931-2012 https://doaj.org/article/eabe7cb227954d61b04da664a21fb6df EN eng Copernicus Publications http://www.biogeosciences.net/9/3931/2012/bg-9-3931-2012.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-9-3931-2012 1726-4170 1726-4189 https://doaj.org/article/eabe7cb227954d61b04da664a21fb6df Biogeosciences, Vol 9, Iss 10, Pp 3931-3942 (2012) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2012 ftdoajarticles https://doi.org/10.5194/bg-9-3931-2012 2022-12-30T23:33:22Z Increasing atmospheric CO 2 concentration is responsible for progressive ocean acidification, ocean warming as well as decreased thickness of upper mixing layer (UML), thus exposing phytoplankton cells not only to lower pH and higher temperatures but also to higher levels of solar UV radiation. In order to evaluate the combined effects of ocean acidification, UV radiation and temperature, we used the diatom Phaeodactylum tricornutum as a model organism and examined its physiological performance after grown under two CO 2 concentrations (390 and 1000 μatm) for more than 20 generations. Compared to the ambient CO 2 level (390 μatm), growth at the elevated CO 2 concentration increased non-photochemical quenching (NPQ) of cells and partially counteracted the harm to PS II (photosystem II) caused by UV-A and UV-B. Such an effect was less pronounced under increased temperature levels. The ratio of repair to UV-B induced damage decreased with increased NPQ, reflecting induction of NPQ when repair dropped behind the damage, and it was higher under the ocean acidification condition, showing that the increased p CO 2 and lowered pH counteracted UV-B induced harm. As for photosynthetic carbon fixation rate which increased with increasing temperature from 15 to 25 °C, the elevated CO 2 and temperature levels synergistically interacted to reduce the inhibition caused by UV-B and thus increase the carbon fixation. Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Biogeosciences 9 10 3931 3942 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 E. W. Helbling V. E. Villafañe Y. Li K. Gao Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Increasing atmospheric CO 2 concentration is responsible for progressive ocean acidification, ocean warming as well as decreased thickness of upper mixing layer (UML), thus exposing phytoplankton cells not only to lower pH and higher temperatures but also to higher levels of solar UV radiation. In order to evaluate the combined effects of ocean acidification, UV radiation and temperature, we used the diatom Phaeodactylum tricornutum as a model organism and examined its physiological performance after grown under two CO 2 concentrations (390 and 1000 μatm) for more than 20 generations. Compared to the ambient CO 2 level (390 μatm), growth at the elevated CO 2 concentration increased non-photochemical quenching (NPQ) of cells and partially counteracted the harm to PS II (photosystem II) caused by UV-A and UV-B. Such an effect was less pronounced under increased temperature levels. The ratio of repair to UV-B induced damage decreased with increased NPQ, reflecting induction of NPQ when repair dropped behind the damage, and it was higher under the ocean acidification condition, showing that the increased p CO 2 and lowered pH counteracted UV-B induced harm. As for photosynthetic carbon fixation rate which increased with increasing temperature from 15 to 25 °C, the elevated CO 2 and temperature levels synergistically interacted to reduce the inhibition caused by UV-B and thus increase the carbon fixation. |
format |
Article in Journal/Newspaper |
author |
E. W. Helbling V. E. Villafañe Y. Li K. Gao |
author_facet |
E. W. Helbling V. E. Villafañe Y. Li K. Gao |
author_sort |
E. W. Helbling |
title |
Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum |
title_short |
Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum |
title_full |
Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum |
title_fullStr |
Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum |
title_full_unstemmed |
Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum |
title_sort |
ocean acidification mediates photosynthetic response to uv radiation and temperature increase in the diatom phaeodactylum tricornutum |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/bg-9-3931-2012 https://doaj.org/article/eabe7cb227954d61b04da664a21fb6df |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Biogeosciences, Vol 9, Iss 10, Pp 3931-3942 (2012) |
op_relation |
http://www.biogeosciences.net/9/3931/2012/bg-9-3931-2012.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-9-3931-2012 1726-4170 1726-4189 https://doaj.org/article/eabe7cb227954d61b04da664a21fb6df |
op_doi |
https://doi.org/10.5194/bg-9-3931-2012 |
container_title |
Biogeosciences |
container_volume |
9 |
container_issue |
10 |
container_start_page |
3931 |
op_container_end_page |
3942 |
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1766156172564365312 |