Figure 5. Action spectra for light-driven proton translocation in Gloeobacter cells (solid line).

Sphaeroplasts of Gloeobacter cells were illuminated through the filters transmitting at 700, 650, 600, 550, 500, 450, and 400 nm. The efficiency of the sphaeroplasts (after the photosynthesis inhibition by DCMU treatment (5×10⁻⁵mol l⁻¹)) was most efficient at 550 nm (dashed line). Integrated H⁺ pumping amount is presented by blank column. Concentration of synthesized ATP is presented by slashed column.