Fig. 4.

PSII parameters obtained for each of the culture conditions, including maximum PSII yield, Y ^max(II); effective PSII yield, Y(II); regulated non-photochemical quenching, Y(NPQ); and background or unregulated non-photochemical quenching, Y(NO). Data from dark adapted cultures are represented with black markers, low PAR (50 μmol photons m⁻² sec⁻¹) illuminated samples with green markers, and high PAR (275 μmol photons m⁻² sec⁻¹) illuminated samples with red markers. The marker sizes correspond to the 1−σ standard deviation (n = 20) obtained from the full data collection period