B. Basal and acquired heat stress resistance of abi1tM. For basal resistance assays (top) plants were directly exposed to 45°C for the indicate time. For acquired resistance (bottom), plants were primed with the respective temperatures for 120 minutes before transfer to 45°C for 150 minutes. Data show the mean ±SE. n=7. The asterisks indicate significant differences compared to wild-type by Student's t-test (*P≤0.05; **P≤0.01 