Changes in <i>C. velia</i> light and dark reactions during a sinusoidal light∶dark cycle.

<p>Changes in O₂ evolution and ETR_PSII (panel A), alpha (photosynthetic efficiency, panel B), C fixation rates (panel C) and the photosynthetic quotient (PQ, panel D) are shown. Error bars are calculated as standard deviations of n≥2 replicated. Average values (plus error bars) measured for LL (▪) and HL (□) grown <i>C. velia</i> are included for comparison. The dashed line shows the light intensity during the light part of the cycle, with a midday peak of 500 µmol photons m⁻² s⁻¹.