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Carotenoid byosinthetic pathway. Provitamin A carotenoids are highlighted in orange. Enzymes with allelic polymorphism studied here are in bold. Single asterisk indicates non-heme di-iron enzymes; double asterisks indicate cytochrome p450 enzymes. GGPP geranyl geranyl diphosphate, PSY phytoene synthase, LCYβ β-cyclase, LCYε ε-cyclase, ABA abscisic acid. Based on Meier et al. (2011); Wurtzel et al. (2012) and Zhou et al. (2012)
