Acclimation physiology of T. pseudonana under elevated CO2

Gwenn Hennon and co-authors have published a new study in the Journal of Phycology on the physiological changes in the diatom Thalassiosira pseudonana under elevated CO2 in a nitrate-limited chemostat. The study finds that acclimation conditions modify the physiological response of the diatom to elevated CO2, with longer acclimations resulting in moderated physiological changes. These results suggest that gene expression or epigenetic changes over tens of generations may moderate some of the extreme physiological changes observed in diatoms under elevated CO2. Understanding these processes will be key in predicting changes to the marine carbon cycle as atmospheric carbon rises.