CO2-induced seawater acidification affects physiological performance of the marine diatom Phaeodactylum tricornutum
By Yaping Wu, K. Gao, U. Riebesell. 2010
268 citations recorded by the source corpus.
Abstract. 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.
Subfields: Oceanography, Renewable Energy, Sustainability and the Environment
View Paper: https://www.semanticscholar.org/paper/2338dcc22d33e0a6eff66048dd234e99b4b87150
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In Oceanography
In Renewable Energy, Sustainability and the Environment
Citations in the corpus
- Phytoplankton niches, traits and eco-evolutionary responses to global environmental change (2012, unknown): “If higher CO 2 increases sensitivity to photoinhibition (Wu et al. 2010), a simultaneous production of heat shock proteins in response to rising temperatures may limit the investment into photoprotective compounds.”
- The C:N:P stoichiometry of organisms and ecosystems in a changing world: A review and perspectives (2012, background): “, 2010) and diatoms (Wu et al., 2010); however, reductions in N2-fixation capacity in response to long-term high CO2 concentrations have been observed in ocean ecosystems (Levitan et al.”