Fig. 5

The effects of foliar application of different concentrations of MJ, ABA, SA, and GA phytohormones (0, 0.2, and 0.4 mM) on the percentage composition of menthol, menthone, menthofuran, and pulegone in the essential oil of flowering peppermint plants. Values are means of three replicates. Error bars represent ± SE. Different letters above the columns represent statistically significant differences at P < 0.05 (Duncan’s multiple range test).