FIG. 4.

Growth phenotype of C. reinhardtii mutants under different light conditions. Serial dilutions of cells were spotted onto minimal agar medium and grown under conditions of low light for 1 week before being shifted to the indicated conditions. Cells were incubated for 72 h in low light (LL) (left) and high light (HL) (middle). For light shift conditions (right), cells were treated in the same way as they were for high light except that they were later transferred back to low light for 5 days. Low light, 50 μmol photons m⁻² s⁻¹; high light, 500 μmol photons m⁻² s⁻¹. WT, wild type.