FIG. 1.

Oxidant and antioxidant capacity in plant lines with modulated glutathione contents. (A) Leaf contents of NADP(H), ascorbate, and GSH in Col-0, cad2, cat2, and cat2 cad2. White bars, reduced forms. Black bars, oxidized forms. (B) Leaf peroxide contents in Col-0, cat2, cat2 cad2, and cat2 gr1. Plants were grown at high CO₂, where the cat2 mutation is silent, then transferred to air to initiate oxidative stress in the cat2 backgrounds. Samples were taken 4 h and 4 days after transfer. Data are means±SE of at least three biological repeats. Different letters indicate significant difference at p<0.05 for leaf contents. Note that x-axis legends to parts A and B are different.