Photosynthtetic capability in act1,dgd1. Chlorophyll fluorescence of Arabidopsis wild type (circle), act1 (diamond), dgd1 (triangle), and act1,dgd1 (square) was measured in whole leaves exposed to different light intensities. The parameters 1-qP (A), ΔF/Fm′ (B), and Fv′/Fm′ (C) were obtained from fluorescence measurements. The inset in B shows ΔF/Fm′ on a different scale. Values represent the means ± se of five measurements.