Expression divergence of duplicate F3'5'H s during ripening. (a) Transcript levels of each F3'5'H are expressed relative to the maximum peak of expression of that gene-copy in that cultivar. Different letters indicate significant differences in relative abundance of copy-specific transcripts among developmental stages. (b) Significant differences in relative abundance of copy-specific transcripts between developmental stages, regardless of the cultivar effect. In the diagram at the bottom of section a, and in section b, colour scale from red to cyan indicates decreasing levels of gene expression during ripening, separated by a Student-Newman-Keuls test. Different letters indicate significant differences (P < 0.05).