Light response curves for electron transport per PSII (A, B) or per total cellular protein (C, D) in <i>Synechococcus</i> (A, C) or <i>Synechocystis</i> (B, D) after 0 (closed symbols) or 120 hours (open symbols) of iron depletion.

<p>Data are expressed in electrons per PSII per second (A, B) or in pmol electrons per μg protein per s. Data were compiled from 6 (<i>Synechococcus</i>) or 5 (<i>Synechocystis</i>) replicate measurements of σ_PSII and q_P performed on 6 or 5 separate cyanobacterial cultures. For estimation of pmol electrons per μg protein per s we also approximated PSII content as fmol PsbA ug total protein⁻¹. Curve fits are photosynthesis/irradiance curves with 95% confidence intervals plotted as outer dotted lines. Iron depletion led significant changes in the curve fits.