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(A) Seedling morphology at PT (25 °C starting temperature) and after 8 h at 45 °C; (B) H2O2 content in leaves under heat stress; (C) Proline content in leaves under heat stress. CK, control; HT, high temperature treatment (45 °C); melatonin-pretreated high-temperature (MTHT), high temperature with melatonin pre-treatment. Data are means of three biological replicates (n = 3). Lowercase letters indicate significant differences (p < 0.05).
