Figure 7.

Blue Light–Induced Quenching in Iron-Starved Wild-Type and ΔIsiA Cells Is Reversible without Protein Synthesis.

Measurements of fluorescence yield by a PAM fluorometer in iron-starved wild-type ([A] and [C]) and ΔIsiA ([B] and [D]) cells for 7 ([A] and [B]) and 14 d ([C] and [D]) at 3 μg chlorophyll/mL illuminated successively with low-intensity blue-green light (400 to 550 nm; 80 μmol photons m⁻² s⁻¹) and high-intensity blue-green light (740 μmol photons m⁻² s⁻¹) and then again with dim blue-green light. Chloramphenicol was present during all experiments. The figure shows a representative experiment.