Neither elevated nor reduced CO2 affects the photophysiological performance of the marine Antarctic diatom Chaetoceros brevis
Enhanced or reduced pCO 2 (partial pressure of CO 2 ) may affect the photosynthetic performance of marine microalgae since changes in pCO 2 can influence the activity of carbon concentrating mechanisms, modulate cellular RuBisCO levels or alter carbon uptake efficiency. In the present study we compa...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1089.6244 2023-05-15T13:44:20+02:00 Neither elevated nor reduced CO2 affects the photophysiological performance of the marine Antarctic diatom Chaetoceros brevis Peter Boelen Willem H Van De Poll Han J Van Der Strate Ika A Neven John Beardall Anita G J Buma The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1089.6244 en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1089.6244 Metadata may be used without restrictions as long as the oai identifier remains attached to it. https://www.rug.nl/research/ocean-ecosystems/research/publications/artikelen/boelen-jembe-2011.pdf text ftciteseerx 2020-05-24T00:20:36Z Enhanced or reduced pCO 2 (partial pressure of CO 2 ) may affect the photosynthetic performance of marine microalgae since changes in pCO 2 can influence the activity of carbon concentrating mechanisms, modulate cellular RuBisCO levels or alter carbon uptake efficiency. In the present study we compared the photophysiology of the Antarctic diatom Chaetoceros brevis at two pCO 2 extremes: 750 ppmv (2× ambient) and 190 ppmv (0.5× ambient) CO 2 . Cultures were acclimated to four irradiance regimes: two regimes simulating deep or shallow vertical mixing, and two regimes mimicking limiting and saturating stable water column conditions. Then, growth rate, pigmentation, RuBisCO large subunit expression, RuBisCO activity, photosynthesis vs irradiance curves, effective quantum yield of PSII (F v /F m ), and POC were measured. The four irradiance regimes induced a suite of photophysiological responses, ranging from low light acclimation to efficient photoprotection. Growth was reduced under the low constant and the deep mixing regime, compared to the shallow mixing and the stable saturating regime. Low stable irradiance resulted in higher light harvesting pigment concentrations, lower RuBisCO activity and a lower light saturation point (E k ) compared to the other irradiance regimes. Highest RuBisCO activity as well as P max levels was measured in the shallow mixing regime, which received the highest total daily light dose. Photoprotection by xanthophyll cycling was observed under all irradiance regimes except the low stable irradiance regime, and xanthophyll cycle pool sizes were higher under the dynamic irradiance regimes. For the fluctuating irradiance regimes, F v /F m was hardly affected by previous excess irradiance exposure, suggesting minimal PSII damage. No significant differences between the two pCO 2 levels were found, with respect to growth, pigment content and composition, photosynthesis, photoprotection and RuBisCO activity, for all four irradiance regimes. Thus, within the range tested, pCO 2 does not ... Text Antarc* Antarctic Unknown Antarctic The Antarctic |
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English |
description |
Enhanced or reduced pCO 2 (partial pressure of CO 2 ) may affect the photosynthetic performance of marine microalgae since changes in pCO 2 can influence the activity of carbon concentrating mechanisms, modulate cellular RuBisCO levels or alter carbon uptake efficiency. In the present study we compared the photophysiology of the Antarctic diatom Chaetoceros brevis at two pCO 2 extremes: 750 ppmv (2× ambient) and 190 ppmv (0.5× ambient) CO 2 . Cultures were acclimated to four irradiance regimes: two regimes simulating deep or shallow vertical mixing, and two regimes mimicking limiting and saturating stable water column conditions. Then, growth rate, pigmentation, RuBisCO large subunit expression, RuBisCO activity, photosynthesis vs irradiance curves, effective quantum yield of PSII (F v /F m ), and POC were measured. The four irradiance regimes induced a suite of photophysiological responses, ranging from low light acclimation to efficient photoprotection. Growth was reduced under the low constant and the deep mixing regime, compared to the shallow mixing and the stable saturating regime. Low stable irradiance resulted in higher light harvesting pigment concentrations, lower RuBisCO activity and a lower light saturation point (E k ) compared to the other irradiance regimes. Highest RuBisCO activity as well as P max levels was measured in the shallow mixing regime, which received the highest total daily light dose. Photoprotection by xanthophyll cycling was observed under all irradiance regimes except the low stable irradiance regime, and xanthophyll cycle pool sizes were higher under the dynamic irradiance regimes. For the fluctuating irradiance regimes, F v /F m was hardly affected by previous excess irradiance exposure, suggesting minimal PSII damage. No significant differences between the two pCO 2 levels were found, with respect to growth, pigment content and composition, photosynthesis, photoprotection and RuBisCO activity, for all four irradiance regimes. Thus, within the range tested, pCO 2 does not ... |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Peter Boelen Willem H Van De Poll Han J Van Der Strate Ika A Neven John Beardall Anita G J Buma |
spellingShingle |
Peter Boelen Willem H Van De Poll Han J Van Der Strate Ika A Neven John Beardall Anita G J Buma Neither elevated nor reduced CO2 affects the photophysiological performance of the marine Antarctic diatom Chaetoceros brevis |
author_facet |
Peter Boelen Willem H Van De Poll Han J Van Der Strate Ika A Neven John Beardall Anita G J Buma |
author_sort |
Peter Boelen |
title |
Neither elevated nor reduced CO2 affects the photophysiological performance of the marine Antarctic diatom Chaetoceros brevis |
title_short |
Neither elevated nor reduced CO2 affects the photophysiological performance of the marine Antarctic diatom Chaetoceros brevis |
title_full |
Neither elevated nor reduced CO2 affects the photophysiological performance of the marine Antarctic diatom Chaetoceros brevis |
title_fullStr |
Neither elevated nor reduced CO2 affects the photophysiological performance of the marine Antarctic diatom Chaetoceros brevis |
title_full_unstemmed |
Neither elevated nor reduced CO2 affects the photophysiological performance of the marine Antarctic diatom Chaetoceros brevis |
title_sort |
neither elevated nor reduced co2 affects the photophysiological performance of the marine antarctic diatom chaetoceros brevis |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1089.6244 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
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Antarc* Antarctic |
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Antarc* Antarctic |
op_source |
https://www.rug.nl/research/ocean-ecosystems/research/publications/artikelen/boelen-jembe-2011.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1089.6244 |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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