FIGURE 8.
Effects of waterlogging (WL) and exogenous melatonin (MT) pretreatment on SAM decarboxylase (SAMDC, A), spermidine synthase (SPDS, B), spermine synthase (SPMS, C) and ADC (D) gene expression in alfalfa plants. 45-day-old alfalfa plants pretreated with 100 μM melatonin and then exposed to 10 days of waterlogging stress. CK-MT, control without melatonin pretreatment; CK+MT, control with melatonin pretreatment; WL-MT, waterlogging without melatonin pretreatment; WL+MT, waterlogging with melatonin pretreatment. Data are expressed as mean ± SE of four replications.