Physiological responses of the marine diatom Thalassiosira pseudonana to increased pCO2 and seawater acidity
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| Format: | Dataset Open Access |
| Sprache: | en |
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2012
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| _version_ | 1867170038940696576 |
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| author | Yang, Gui yuan Gao, Kunshan |
| author_facet | Yang, Gui yuan Gao, Kunshan |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | We studied the effects of elevated CO2 concentration and seawater acidity on inorganic carbon acquisition, photoinhibition and photoprotection as well as growth and respiration in the marine diatom Thalassiosira pseudonana. After having grown under the elevated CO2 level (1000 µatm, pH 7.83) at sub-saturating photosynthetically active radiation (PAR, 75 µmol photons/m**2/s) for 20 generations, photosynthesis and dark respiration of the alga increased by 25% (14.69 ± 2.55 fmol C/cell/h) and by 35% (4.42 ± 0.98 fmol O2/cell/h), respectively, compared to that grown under the ambient CO2 level (390 µatm, pH 8.16), leading to insignificant effects on growth (1.09 ± 0.08 (1/d))v 1.04 ± 0.07 (1/d)). The photosynthetic affinity for CO2 was lowered in the high-CO2 grown cells, reflecting a down-regulation of the CO2 concentrating mechanism (CCM). When exposed to an excessively high level of PAR, photochemical and non-photochemical quenching responded similarly in the low- and high-CO2 grown cells, reflecting that photoinhibition was not influenced by the enriched level of CO2. In T. pseudonana, it appeared that the energy saved due to the down-regulated CCM did not contribute to any additional light stress as previously found in another diatom Phaeodactylum tricornutum, indicating differential physiological responses to ocean acidification between these two diatom species. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_826461 |
| institution | PANGAEA |
| language | en |
| publishDate | 2012 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Physiological responses of the marine diatom Thalassiosira pseudonana to increased pCO2 and seawater acidity Yang, Gui yuan Gao, Kunshan Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Bicarbonate ion; Bicarbonate ion, standard deviation; Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, reciprocal of photosynthetic affinity value; Carbon, inorganic, dissolved, reciprocal of photosynthetic affinity value, standard deviation; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, reciprocal of photosynthetic affinity value; Carbon dioxide, reciprocal of photosynthetic affinity value, standard deviation; Carbon dioxide, standard deviation; Chlorophyll a, standard deviation; Chlorophyll a per cell; Chlorophyll c, standard deviation; Chlorophyll c per cell; Effective absorbance cross-section of photosystem II; Effective absorbance cross-section of photosystem II, standard deviation; Effective quantum yield; Effective quantum yield, standard deviation; Electron transport rate, relative, maximum velocity; Electron transport rate, relative, maximum velocity, standard deviation; Electron transport rate, relative, standard deviation; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gross carbon fixation rate, standard deviation; Gross carbon fixation rate per cell; Growth rate; Growth rate, standard deviation; Identification; Irradiance; Laboratory experiment; Laboratory strains; Light; Light saturation point; Light saturation point, standard deviation; Maximal electron transport rate, relative; Non photochemical quenching; Non photochemical quenching, standard deviation; North Pacific; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Ochrophyta; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH, NBS scale; pH, standard deviation; pH, total scale; Photosynthetic carbon fixation, maximum velocity, standard deviation; Photosynthetic carbon fixation per cell, maximum velocity; Photosynthetic carbon fixation rate, standard deviation; Photosynthetic carbon fixation rate per cell; Photosynthetic efficiency; Photosynthetic efficiency, standard deviation; Phytoplankton; Respiration; Respiration rate, oxygen, per cell; Respiration rate, oxygen, standard deviation; Salinity; Species; Temperature, water; Thalassiosira pseudonana; Time in seconds; Treatment We studied the effects of elevated CO2 concentration and seawater acidity on inorganic carbon acquisition, photoinhibition and photoprotection as well as growth and respiration in the marine diatom Thalassiosira pseudonana. After having grown under the elevated CO2 level (1000 µatm, pH 7.83) at sub-saturating photosynthetically active radiation (PAR, 75 µmol photons/m**2/s) for 20 generations, photosynthesis and dark respiration of the alga increased by 25% (14.69 ± 2.55 fmol C/cell/h) and by 35% (4.42 ± 0.98 fmol O2/cell/h), respectively, compared to that grown under the ambient CO2 level (390 µatm, pH 8.16), leading to insignificant effects on growth (1.09 ± 0.08 (1/d))v 1.04 ± 0.07 (1/d)). The photosynthetic affinity for CO2 was lowered in the high-CO2 grown cells, reflecting a down-regulation of the CO2 concentrating mechanism (CCM). When exposed to an excessively high level of PAR, photochemical and non-photochemical quenching responded similarly in the low- and high-CO2 grown cells, reflecting that photoinhibition was not influenced by the enriched level of CO2. In T. pseudonana, it appeared that the energy saved due to the down-regulated CCM did not contribute to any additional light stress as previously found in another diatom Phaeodactylum tricornutum, indicating differential physiological responses to ocean acidification between these two diatom species. |
| title | Physiological responses of the marine diatom Thalassiosira pseudonana to increased pCO2 and seawater acidity |
| topic | Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Bicarbonate ion; Bicarbonate ion, standard deviation; Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, reciprocal of photosynthetic affinity value; Carbon, inorganic, dissolved, reciprocal of photosynthetic affinity value, standard deviation; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, reciprocal of photosynthetic affinity value; Carbon dioxide, reciprocal of photosynthetic affinity value, standard deviation; Carbon dioxide, standard deviation; Chlorophyll a, standard deviation; Chlorophyll a per cell; Chlorophyll c, standard deviation; Chlorophyll c per cell; Effective absorbance cross-section of photosystem II; Effective absorbance cross-section of photosystem II, standard deviation; Effective quantum yield; Effective quantum yield, standard deviation; Electron transport rate, relative, maximum velocity; Electron transport rate, relative, maximum velocity, standard deviation; Electron transport rate, relative, standard deviation; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gross carbon fixation rate, standard deviation; Gross carbon fixation rate per cell; Growth rate; Growth rate, standard deviation; Identification; Irradiance; Laboratory experiment; Laboratory strains; Light; Light saturation point; Light saturation point, standard deviation; Maximal electron transport rate, relative; Non photochemical quenching; Non photochemical quenching, standard deviation; North Pacific; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Ochrophyta; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH, NBS scale; pH, standard deviation; pH, total scale; Photosynthetic carbon fixation, maximum velocity, standard deviation; Photosynthetic carbon fixation per cell, maximum velocity; Photosynthetic carbon fixation rate, standard deviation; Photosynthetic carbon fixation rate per cell; Photosynthetic efficiency; Photosynthetic efficiency, standard deviation; Phytoplankton; Respiration; Respiration rate, oxygen, per cell; Respiration rate, oxygen, standard deviation; Salinity; Species; Temperature, water; Thalassiosira pseudonana; Time in seconds; Treatment |
| url | https://doi.org/10.1594/PANGAEA.826461 |