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Background  Increasing CO 2  emissions have resulted in ocean acidification, affecting marine plant photosynthesis and changing the nutrient composition of marine ecosystems. The physiological and biochemical processes of marine phytoplankton in response to ocean acidification have been reported, but have been mainly focused on growth and photosynthetic physiology. To acquire a thorough knowledge of the molecular regulation mechanisms, model species with clear genetic background should be selected for systematic study.  Phaeodactylum tricornutum  is a pennate diatom with the characteristics of small genome size, short generation cycle, and easy to transform. Furthermore, the genome of  P. tricornutum  has been completely sequenced.    Results and discussion  In this study,  P. tricornutum  was cultured at high and normal CO 2  concentrations. Cell composition changes during culture time were investigated. The  13 C isotope tracing technique was used to determine fractional labeling enrichments for the main cellular components. The results suggested that when lipid content increased significantly under high CO 2  conditions, total protein and soluble sugar contents decreased. The  13 C labeling experiment indicated that the C skeleton needed for fatty acid C chain elongation in lipid synthesis under high CO 2  conditions is not mainly derived from NaHCO 3  (carbon fixed by photosynthesis).    Conclusion  This study indicated that breakdown of intracellular protein and soluble sugar provide C skeleton for lipid synthesis under high CO 2  concentration.

bmc biotechnology

Provision of carbon skeleton for lipid synthesis from the breakdown of intracellular protein and soluble sugar in Phaeodactylum tricornutum under high CO2