Fig. 8

A corrplot-based graph was used to visually interpret the potential pairwise correlations among the relative expression levels of genes involved in the menthol biosynthesis pathway, the contents of menthol, menthone, menthofuran, and pulegone, as well as oxidative stress markers (Hâ‚‚Oâ‚‚, CAT, APX, and GPX). The size of each circle and the shading volume of the colors are equivalent to the association degrees between each pairwise comparison.