Fig. 2.

Comparison of gene expression for carotenoid biosynthesis between the Satsuma mandarin and Valencia orange in juice sacs during massive carotenoid accumulation. The width of the arrows indicates the relative gene expression levels for carotenoid-biosynthetic enzymes. Carotenoids written in white characters were abundant in each citrus species. Abbreviations of carotenoid-biosynthetic enzymes: PSY, phytoene synthase; PDS, phytoene desaturase; ZDS, ζ-carotene desaturase; LCYb, lycopene β-cyclase; HYb, β-ring hydroxylase; ZEP, zeaxanthin epoxidase; NCED, 9-cis-epoxycarotenoid dioxygenase.