Figure 3.

Acquired thermotolerance of plants induced by 5- or 45-min heat stress followed by different durations of recovery. (a) Acquired thermotolerance of plants acclimated with 5-min heat stress. (b) Acquired thermotolerance of plants acclimated with 45-min heat stress. Plants were pre-exposed to 5 (A) or 45 (B) min heat stress followed by 0–3 h recovery. Then, plants were subjected to lethal heat stress. Heat tolerance was evaluated by fresh weight. **; Student’s t-test significant at p < .01 (n = 15–35) compared to plants subjected to lethal heat stress without pre-treatment with 5-min heat stress (no ACC). Bars indicate standard error.