Figure 4.

APX (A) and GR (B) activity of mustard seedling shoots during the thermoprotection period following either spraying with 100 μm SA solution (gray bars) or a 1-h temperature-acclimation treatment (45°C) in the dark (white bars). Controls (black bars) were kept at 24°C without spraying. Controls sprayed with water were not significantly different from nonsprayed controls. Control measurements taken during the course of the experiment showed no significant variation. Bars represent se (n = 6–10). Asterisks are as in the Figure 2 legend. Chl, Chlorophyll.