Fig. 4From: Carbon monoxide is involved in melatonin-enhanced drought resistance in tomato seedlings by enhancing chlorophyll synthesis pathwayEffects of MT, CO, MT + CO, and MT + Hb on root length (a) and plant height (b) of tomato seedlings under drought stress. Photographs (c) showed the tomato seedlings treated by 7 days. The data are the average of three replicates and are presented as means ± SE. Different letters indicate significant differences at P < 0.05 according to Duncan’s multiple range testsBack to article page