Fig. 4From: The role of melatonin on caspase-3-like activity and expression of the genes involved in programmed cell death (PCD) induced by in vitro salt stress in alfalfa (Medicago sativa L.) rootsEffect of melatonin on the activity of caspase-3 like proteases based on the cleavage of the substrate, DEVD-AFC. Data represents the mean of replicates ± SD and uncommon letters indicate significant differences based on Duncan's multiple range test (P < 0.05)Back to article page