FIGURE 3.

Physiological characterization of the Δpsb27 mutant. A, the oxygen-evolving activities of wild-type (WT) and Δpsb27 mutant cells grown at 100 μmol of photons × m⁻² × s⁻¹ and 45 and 30 °C are compared. The measurement was carried out with cells in their early logarithmic growth phase (OD_{750 nm} = 0.6). Error bars represent S.D. (n = 3). B, fluorescence yield changes were measured, and q_P values for wild-type and Δpsb27 cells were calculated to determine the effect of different growth conditions on photochemical efficiency. Cells were grown at 45 and 30 °C and 100 μmol of photons × m⁻² × s⁻¹. Error bars represent S.D. (n = 3).