Effect of Species and phylogeny on the entire GSL matrix and phytochemical diversity.
Across all Cardamine species we found 51 GSL compounds: 22 aliphatic-GSLs, 6 aromatic-GSLs, 3 indole-GSLs, and 20 unknown GSLs (Table S2). Plant species differed significantly in the identity and amount of GSLs produced (Fig. 1; PERMANOVA: F13, 64 = 16.956, p = 0.001), but the difference in GSLs’ profiles was not correlated with phylogenetic distance across species (Fig. 1, Mantel test: r = 0.15, p = 0.3). In addition, we found significant differences among species in all the seven indices of GSL diversity (Table S3).