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Effects of exogenous melatonin on chloroplast structure under chilling stress. The second, fully expanded leaves were measured after 4 days of chilling. (A–C) Control (28/18°C); (D–F) Control + Melatonin (200 μM melatonin, 28/18°C); (G–I) Chilling (15/8°C); (J–L) Chilling + Melatonin (200 μM melatonin, 15/8°C). SL, stoma lamellae; GL, grana lamellae; SG, starch grains.
