Fig. 1

Metabolic pathways involved in biosynthesis of carotenoids via DOXP route with related genes of tomato. The enzymes involved in the carotenoid synthesis are: DOXP reductoisomerase (DXR), hydroxymethylbutenyl diphosphate synthase (HDS), hydroxymethylbutenyl diphosphate reductase (HDR), geranylgeranyl pyrophosphate synthase (GGPPS), phytoene synthase (PSY), phytoene desaturase (PDS), z-carotene desaturase (ZDS), carotene isomerase (CRTISO), lycopene ε cyclase (LCYE), lycopene β cyclase (LCYB), β-carotene hydroxylase (CHYB), cytochrome P450-type monooxygenase 97C (CYP97C), zeaxanthin epoxidase (ZEP), geranylgeranyl oxidase (GGRS), chlorophyll synthase (CHL). The carotenoids measured by HPLC are denoted in red color. Dotted rectangle denote carotenoid pathway, genes analyzed in this work are colored in green and regulatory gene SGR is colored in blue