Figure 4.

Photosynthetic parameters related to elements of photosynthesis downstream from PS II measured from steady-state cultures corresponding toeach respective light regime: (■) 53 μmol photons m⁻² · s⁻¹ of 680 nm light plus variable amounts of 630 nm light, (●) 50 μmol photons m⁻² · s⁻¹ of 630 nm light plus variable amounts of 680 nm light, (▲) 630 nm light only, or (♦) 680 nm light only. (A) Comparisons for the proxy rates of plastoquinone oxidation [fluorescent units (f.u.; measured in voltage) per second] in the dark measured for different growth rates. (B) Comparisons of proxy rates for cyclic electron flow (f.u. s⁻¹) measured for different growth rates.