Figure 1.

Endogenous levels of total SA (A), glucosylated SA (B), and free SA (C) in mustard seedling shoots during and following a 1-h temperature-acclimation treatment (45°C) in the dark (Accl D). Bars represent se of at least three samples (n = 3–10), each consisting of 10 to 15 seedlings. Control measurements taken during the course of the experiment showed no significant variation. Levels of free and glucosylated SA in controls kept in the dark for 1 h at 24°C were not significantly different from the controls kept in the light at 24°C, 1 and 2 h after dark treatment (data not shown). Asterisks indicate significant differences from controls (P < 0.05). FW, Fresh weight.