Figure 7.

Oxidative stress response in mutant plants devoid of Trxs y. (A) Wild type and mutant lines were grown under long-day photoperiod for 4 weeks and sprayed with methyl viologen (15 μM) in 0.025% Tween-20. The F_v/F_m, representing the maximum potential quantum efficiency of photosystem II, was measured before (mock) and after (1 and 4 days) the treatment with methyl viologen. F_v/F_m is represented as average values ± standard error (SE) of 7 (mock) or 14 (methyl viologen) plants. Letters indicate significant differences (p < 0.05) determined by one-way ANOVA followed by Tukey’s post-test. (B) False-color images representing F_v/F_m in mock- and methyl viologen-treated plants. Signal intensities (from 0 to 1.0) are indicated according to the color scale bar.