Fig. 4

Effects of melatonin on the photosynthetic pigment content of tomato leaves under saline-alkali stress. (A) Chl-a, Chlorophyll a content. (B) Chl-b, Chlorophyll b content. (C) Chl-total, Total chlorophyll content. (D) Carotenoid content. The results in the figure are means ± SE of three independent replications.