A Anthocyanin biosynthesis pathway. 3-GT, anthocyanidin 3-O-glucosyltransferase; 4CL, 4-coumarate CoA ligase; ANS, anthocyanidin synthase; C4H, cinnamic 4-hydroxylase; CHI, chalcone isomerase; CHS, chalcone synthase; DFR, dihydroflavonol 4-reductase; F3H, flavanone 3-hydroxylase; F3’H, flavonoid 3′-hydroxylase; F3’5’H, flavonoid 3′,5′-hydroxylase; PAL, phenylalanine ammonia-lyase; PTAL, phenylalanine/tyrosine ammonia-lyase. B The number of enzyme-coding genes in anthocyanin biosynthesis pathway of 10 species. The number in each cell indicates gene number. C Expression levels of enzyme-coding genes in the bracts of Musa ornata and Musa velutina. The expression values were standardized by the TPM method.