Fig. 3

Venn analysis of identified differentially accumulated metabolites (DAMs) in maize in different comparison groups (a) and accumulation patterns of shared differentially accumulated flavonoids (DAFs) in four different colors of maize (b). W represents white kernels, Y represents yellow kernels, R represents red–purple kernels, and P represents purple–black kernels. Metabolites marked with red and green indicate up- and down-accumulated in maize kernel, respectively