Figure 3.
Light stress increases photodamage in plants with a reduced cytokinin status. Photochemical efficiency was measured in detached leaves of 4-week-old Arabidopsis plants. A, Fv/Fm of leaf 6 irradiated for 3 h with HL in the absence or presence of 1 mm lincomycin (+ L). B, Fv/Fm of leaf 7 treated for 24 h with continuous light (CL) at 22°C and 10°C. Asterisks indicate significant differences from the respective wild-type condition (* 0.05 > P > 0.01; ** 0.01 > P > 0.001; *** P < 0.001). Error bars represent se (n = 8). C, Blot analysis of D1 protein in leaf material derived from the experiment shown in A. Numbers above the blots indicate D1 protein level as a percentage of the wild-type (WT) control (n = 4). Representative blots are shown. RBCL, Large subunit of Rubisco.