FIGURE 6.

Effects of elevated CO₂ and heat stress either alone or combined on the ascorbate-glutatione (AsA-GSH) pool and redox state in tomato leaves. Leaf samples for biochemical analysis were harvested after 24 h heat treatment and at 24 h recovery after the heat stress along with the control. Data are the means of four replicates (±SD). Mean denoted by different letters indicate significant differences between the treatments (P < 0.05). Ascorbate, AsA; dehydro ascorbate, DHA; GSH, reduced glutathione; GSSG, oxidized glutathione.