Schematic of physiological and metabolic data related to chrysanthemum flower colour during capitulum development. A, Changes in colour phenotypes of ray florets during capitulum development. Scale bar = 0.5 cm. B, Changes in relative anthocyanin content during the first three capitulum developmental stages (S1, S2 and S3) detected by HPLC analysis. The x-axis and y-axis represent the relative anthocyanin content and the three capitulum developmental stages, respectively. C, Anthocyanin biosynthesis pathway. Enzyme names, unigene names and expression patterns are indicated on the right of each step. The expression patterns of each unigene or contig are shown using different grids from blue (−4.0) to red (13.0), with the values representing the log10 FPKM values. The higher the grid values, the higher the gene expression levels. a and b represent the light and dark libraries, respectively.