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Ocean acidification (OA) due to atmospheric CO 2  rise is expected to influence marine primary productivity. In order to investigate the interactive effects of OA and light changes on diatoms, we grew  Phaeodactylum tricornutum , under ambient (390 ppmv; LC) and elevated CO 2  (1000 ppmv; HC) conditions for 80 generations, and measured its physiological performance under different light levels (60 µmol m −2  s −1 , LL; 200 µmol m −2  s −1 , ML; 460 µmol m −2  s −1 , HL) for another 25 generations. The specific growth rate of the HC-grown cells was higher (about 12–18%) than that of the LC-grown ones, with the highest under the ML level. With increasing light levels, the effective photochemical yield of PSII (F v ′/F m ′) decreased, but was enhanced by the elevated CO 2 , especially under the HL level. The cells acclimated to the HC condition showed a higher recovery rate of their photochemical yield of PSII compared to the LC-grown cells. For the HC-grown cells, dissolved inorganic carbon or CO 2  levels for half saturation of photosynthesis (K 1/2  DIC or K 1/2  CO 2 ) increased by 11, 55 and 32%, under the LL, ML and HL levels, reflecting a light dependent down-regulation of carbon concentrating mechanisms (CCMs). The linkage between higher level of the CCMs down-regulation and higher growth rate at ML under OA supports the theory that the saved energy from CCMs down-regulation adds on to enhance the growth of the diatom.

Light-Modulated Responses of Growth and Photosynthetic Performance to Ocean Acidification in the Model Diatom Phaeodactylum tricornutum