Fig. 7

Heatmap clustering of different phytohormone treatments (MJ, ABA, SA, and GA) at three concentrations (0, 0.2, and 0.4 mM), based on the expression patterns of genes involved in menthol biosynthesis, the relative contents of menthol, menthone, menthofuran, and pulegone, as well as oxidative stress markers in peppermint. Both rows and columns were clustered using maximum distance and average linkage methods.