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...
Published in: | Biogeosciences |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2010
|
Subjects: | |
Online Access: | 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 |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00028497 |
---|---|
record_format |
openpolar |
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 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-7-2915-2010 |
container_title |
Biogeosciences |
container_volume |
7 |
container_issue |
9 |
container_start_page |
2915 |
op_container_end_page |
2923 |
_version_ |
1766158496135380992 |