Photosynthesis rates of aureo1a-15 (grey triangles) and aureo1a-50 (white circles) P. tricornutum cultures depending on the incident light intensity in the measuring cuvette; corresponding WT data of Schellenberger Costa et al.

[28] (black squares) are included for better comparison. Algae were cultivated at a Q_Phar of 10 µmol absorbed photons m⁻² s⁻¹ (LL) under illumination with blue (A) and red light (B) and further at a Q_Phar of 30 µmol absorbed photons m⁻² s⁻¹ (ML) under illumination with blue (C) and red light (D). Mean values are shown with standard deviation (n = 9). Maximum photosynthesis rates of each culture condition were tested for the occurrence of significant differences between WT and aureochrome 1a silenced strains using a one-way ANOVA followed by a Holms-Sidak pair-wise comparison test with the WT as control group. Significant differences are marked with asterisks (p<0.05).