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Schematic representation of the biosynthetic pathway of ascorbic acid in carrot: (1) hexokinase; (2) phosphoglucose isomerase; (3) phosphomannose isomerase; (4) phosphomannose mutase; (5) guanosine diphosphate (GDP)-mannose pyrophosphorylase; (6) GDP-mannose epimerase; (7) GDP-l-galactose phosphorylase; (8) l-galactose-phosphatase; (9) l-galactose-dehydrogenase; (10) l-galactose-1,4-lactone dehydrogenase.
