Fig. 1: Effects of melatonin on melon root development under CuSO4 stress.

CK1 non-stressed seeds pretreated with water, CK2 300 μmol/L CuSO4-stressed seeds pretreated with water, MT1–MT6 300 μmol/L CuSO4-stressed seeds pretreated with 10, 50, 100, 300, 500, or 800 μmol/L melatonin, respectively. Scale bar = 2 cm