Figure 4.

Slow redox kinetics of PSI measured as change in A₈₃₀ after illumination with strong far-red light (710 nm) for 20 s (up and down arrows indicate switching of actinic light on and off). Cells precultured under HC conditions of the wild type (WT) and the mutant Δsml0013::Km were measured without the addition of inhibitors, after the addition of KCN to inhibit electron flow into the respiratory electron chain toward Cytc oxidase, and after combined addition of KCN and DCMU to inhibit both respiratory and photosynthetic linear electron flow from PSII.