CO2-induced seawater acidification affects physiological performance of the marine diatom Phaeodactylum tricornutum
CO 2 /pH perturbation experiments were carried out under two different p CO 2 levels (39.3 and 101.3 Pa) to evaluate effects of CO 2 -induced ocean acidification on the marine diatom Phaeodactylum tricornutum. After acclimation (>20 generations) to ambient and elevated CO 2 conditions (with corre...
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ftcopernicus:oai:publications.copernicus.org:bg7513 2023-05-15T17:51:29+02:00 CO2-induced seawater acidification affects physiological performance of the marine diatom Phaeodactylum tricornutum Wu, Y. Gao, K. Riebesell, U. 2018-09-27 application/pdf https://doi.org/10.5194/bg-7-2915-2010 https://www.biogeosciences.net/7/2915/2010/ eng eng doi:10.5194/bg-7-2915-2010 https://www.biogeosciences.net/7/2915/2010/ eISSN: 1726-4189 Text 2018 ftcopernicus https://doi.org/10.5194/bg-7-2915-2010 2019-12-24T09:57:14Z CO 2 /pH perturbation experiments were carried out under two different p CO 2 levels (39.3 and 101.3 Pa) to evaluate effects of CO 2 -induced ocean acidification on the marine diatom Phaeodactylum tricornutum. After acclimation (>20 generations) to ambient and elevated CO 2 conditions (with corresponding pH values of 8.15 and 7.80, respectively), growth and photosynthetic carbon fixation rates of high CO 2 grown cells were enhanced by 5% and 12%, respectively, and dark respiration stimulated by 34% compared to cells grown at ambient CO 2 . The half saturation constant ( K m ) for carbon fixation (dissolved inorganic carbon, DIC) increased by 20% under the low pH and high CO 2 condition, reflecting a decreased affinity for HCO 3 – or/and CO 2 and down-regulated carbon concentrating mechanism (CCM). In the high CO 2 grown cells, the electron transport rate from photosystem II (PSII) was photoinhibited to a greater extent at high levels of photosynthetically active radiation, while non-photochemical quenching was reduced compared to low CO 2 grown cells. This was probably due to the down-regulation of CCM, which serves as a sink for excessive energy. The balance between these positive and negative effects on diatom productivity will be a key factor in determining the net effect of rising atmospheric CO 2 on ocean primary production. Text Ocean acidification Copernicus Publications: E-Journals Biogeosciences 7 9 2915 2923 |
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Copernicus Publications: E-Journals |
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English |
description |
CO 2 /pH perturbation experiments were carried out under two different p CO 2 levels (39.3 and 101.3 Pa) to evaluate effects of CO 2 -induced ocean acidification on the marine diatom Phaeodactylum tricornutum. After acclimation (>20 generations) to ambient and elevated CO 2 conditions (with corresponding pH values of 8.15 and 7.80, respectively), growth and photosynthetic carbon fixation rates of high CO 2 grown cells were enhanced by 5% and 12%, respectively, and dark respiration stimulated by 34% compared to cells grown at ambient CO 2 . The half saturation constant ( K m ) for carbon fixation (dissolved inorganic carbon, DIC) increased by 20% under the low pH and high CO 2 condition, reflecting a decreased affinity for HCO 3 – or/and CO 2 and down-regulated carbon concentrating mechanism (CCM). In the high CO 2 grown cells, the electron transport rate from photosystem II (PSII) was photoinhibited to a greater extent at high levels of photosynthetically active radiation, while non-photochemical quenching was reduced compared to low CO 2 grown cells. This was probably due to the down-regulation of CCM, which serves as a sink for excessive energy. The balance between these positive and negative effects on diatom productivity will be a key factor in determining the net effect of rising atmospheric CO 2 on ocean primary production. |
format |
Text |
author |
Wu, Y. Gao, K. Riebesell, U. |
spellingShingle |
Wu, Y. Gao, K. Riebesell, U. CO2-induced seawater acidification affects physiological performance of the marine diatom Phaeodactylum tricornutum |
author_facet |
Wu, Y. Gao, K. Riebesell, U. |
author_sort |
Wu, Y. |
title |
CO2-induced seawater acidification affects physiological performance of the marine diatom Phaeodactylum tricornutum |
title_short |
CO2-induced seawater acidification affects physiological performance of the marine diatom Phaeodactylum tricornutum |
title_full |
CO2-induced seawater acidification affects physiological performance of the marine diatom Phaeodactylum tricornutum |
title_fullStr |
CO2-induced seawater acidification affects physiological performance of the marine diatom Phaeodactylum tricornutum |
title_full_unstemmed |
CO2-induced seawater acidification affects physiological performance of the marine diatom Phaeodactylum tricornutum |
title_sort |
co2-induced seawater acidification affects physiological performance of the marine diatom phaeodactylum tricornutum |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-7-2915-2010 https://www.biogeosciences.net/7/2915/2010/ |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-7-2915-2010 https://www.biogeosciences.net/7/2915/2010/ |
op_doi |
https://doi.org/10.5194/bg-7-2915-2010 |
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Biogeosciences |
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2915 |
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2923 |
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1766158654042537984 |