Fig. 5.

Expression of genes related to carotenoid biosynthesis in apricot fruit. a Carotenoid biosynthesis pathway in apricot fruit. IPI, isopentenyl diphosphate isomerase; GGPPS, geranylgeranyl diphosphate synthase; PSY, phytoene synthase; PDS, phytoene desaturase; ZDS, ζ-carotene desaturase; CRTISO, carotenoid isomerase; LCYE, lycopene ε-cyclase; LCYB, lycopene β-cyclase; CHYB, β-carotene hydroxylase; ZEP, zeaxanthin epoxidase; VDE, violaxanthin de-epoxidase; NXS, neoxanthin synthase; CCD, carotenoid cleavage dioxygenase; NCED, 9-cis-epoxycarotenoid dioxygenase. b Heatmap of the expression of genes related to carotenoid biosynthesis during fruit ripening. Columns and rows represent samples and gene names in the heatmap, respectively. Red, blue and white indicate high expression, low expression and the absence (or undetectable levels) of detectable transcripts at the corresponding stage, respectively. c The linear fitting equation and R squared values between the FPKM and qRT-PCR values