Fig. 6

Evolution and expression of key genes involved in benzenoid/phenylpropanoid biosynthesis. a Expression profiles of genes encoding enzymes possibly involved in the shikimate/benzenoid pathway in wintersweet. Abbreviations for enzymes in each catalytic step are shown in bold. The gradient color for each gene represents the gene expression levels in three petal developmental stages in wintersweet (S1: bud stage; S4: full open flower stage; S5: senescence stage). Homologous genes are represented by equal colored horizontal stripes and are termed from top to bottom in Arabic numerical order. The full names of enzymes are listed in the Additional file 1: Table S21. The genes circled in black and red boxes were generated by WGD and tandem duplication events respectively. The non-boxed genes did not undergo these events. b Schematic representation of the wintersweet chromosomes together with the positions of key genes involved in benzenoid/phenylpropanoid biosynthesis. The genes marked in brown and red were generated by WGD and tandem duplication events respectively. c Expression profiles of the 21 BEAT homologous genes in three different stages (S1, S4, and S5). These genes were expressed in at least one of the three developmental stages