CO2-induced seawater acidification affects physiological performance of the marine diatom Phaeodactylum tricornutum

CO2/pH perturbation experiments were carried out under two different pCO2 levels (39.3 and 101.3 Pa) to evaluate effects of CO2-induced ocean acidification on the marine diatom Phaeodactylum tricornutum. After acclimation (>20 generations) to ambient and elevated CO2 conditions (with correspondin...

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Published in:Biogeosciences
Main Authors: Wu, Y., Gao, K., Riebesell, U.
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2010
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Online Access:https://doi.org/10.5194/bg-7-2915-2010
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spelling ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00028497 2023-05-15T17:51:22+02:00 CO2-induced seawater acidification affects physiological performance of the marine diatom Phaeodactylum tricornutum Wu, Y. Gao, K. Riebesell, U. 2010-09 electronic https://doi.org/10.5194/bg-7-2915-2010 https://noa.gwlb.de/receive/cop_mods_00028497 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00028452/bg-7-2915-2010.pdf https://bg.copernicus.org/articles/7/2915/2010/bg-7-2915-2010.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-7-2915-2010 https://noa.gwlb.de/receive/cop_mods_00028497 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00028452/bg-7-2915-2010.pdf https://bg.copernicus.org/articles/7/2915/2010/bg-7-2915-2010.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2010 ftnonlinearchiv https://doi.org/10.5194/bg-7-2915-2010 2022-02-08T22:48:09Z CO2/pH perturbation experiments were carried out under two different pCO2 levels (39.3 and 101.3 Pa) to evaluate effects of CO2-induced ocean acidification on the marine diatom Phaeodactylum tricornutum. After acclimation (>20 generations) to ambient and elevated CO2 conditions (with corresponding pH values of 8.15 and 7.80, respectively), growth and photosynthetic carbon fixation rates of high CO2 grown cells were enhanced by 5% and 12%, respectively, and dark respiration stimulated by 34% compared to cells grown at ambient CO2. The half saturation constant (Km) for carbon fixation (dissolved inorganic carbon, DIC) increased by 20% under the low pH and high CO2 condition, reflecting a decreased affinity for HCO3– or/and CO2 and down-regulated carbon concentrating mechanism (CCM). In the high CO2 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 CO2 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 CO2 on ocean primary production. Article in Journal/Newspaper Ocean acidification Niedersächsisches Online-Archiv NOA Biogeosciences 7 9 2915 2923
institution Open Polar
collection Niedersächsisches Online-Archiv NOA
op_collection_id ftnonlinearchiv
language English
topic article
Verlagsveröffentlichung
spellingShingle article
Verlagsveröffentlichung
Wu, Y.
Gao, K.
Riebesell, U.
CO2-induced seawater acidification affects physiological performance of the marine diatom Phaeodactylum tricornutum
topic_facet article
Verlagsveröffentlichung
description CO2/pH perturbation experiments were carried out under two different pCO2 levels (39.3 and 101.3 Pa) to evaluate effects of CO2-induced ocean acidification on the marine diatom Phaeodactylum tricornutum. After acclimation (>20 generations) to ambient and elevated CO2 conditions (with corresponding pH values of 8.15 and 7.80, respectively), growth and photosynthetic carbon fixation rates of high CO2 grown cells were enhanced by 5% and 12%, respectively, and dark respiration stimulated by 34% compared to cells grown at ambient CO2. The half saturation constant (Km) for carbon fixation (dissolved inorganic carbon, DIC) increased by 20% under the low pH and high CO2 condition, reflecting a decreased affinity for HCO3– or/and CO2 and down-regulated carbon concentrating mechanism (CCM). In the high CO2 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 CO2 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 CO2 on ocean primary production.
format Article in Journal/Newspaper
author Wu, Y.
Gao, K.
Riebesell, U.
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
publisher Copernicus Publications
publishDate 2010
url https://doi.org/10.5194/bg-7-2915-2010
https://noa.gwlb.de/receive/cop_mods_00028497
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00028452/bg-7-2915-2010.pdf
https://bg.copernicus.org/articles/7/2915/2010/bg-7-2915-2010.pdf
genre Ocean acidification
genre_facet Ocean acidification
op_relation Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189
https://doi.org/10.5194/bg-7-2915-2010
https://noa.gwlb.de/receive/cop_mods_00028497
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00028452/bg-7-2915-2010.pdf
https://bg.copernicus.org/articles/7/2915/2010/bg-7-2915-2010.pdf
op_rights uneingeschränkt
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op_doi https://doi.org/10.5194/bg-7-2915-2010
container_title Biogeosciences
container_volume 7
container_issue 9
container_start_page 2915
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