Vitamin C,also known as Ascorbate acid(AsA),was an essential compound with multiple functions in many organisms.This article reviewed the physiological functions of vitamin C in plants,as well as the L-galactose pathway,D-galactouronic acid pathway,L-gulose pathway,inositol path-way and ascorbic acid cycle pathway involved in AsA synthesis in plant fruits,and analyzed the func-tions and expressions of related genes.16 genes involved in the synthesis and circulation of AsA:PMI,PMM,GMP,GME,GGP,GPP,GalDH,GLDH,GalUR,MIOX,GuLDH,MDHAR,DHAR,AO,APX,GR,and their roles in AsA metabolic pathways were reviewed.The pathways of AsA syn-thesis and metabolism in plant fruits were diverse.And the expressions of key genes affected the synthe-sis and metabolism of AsA in fruits to varying degrees.Understanding the function and expression of AsA synthesis and related genes in plant fruits could lay the foundation for the production of transgenic fruit and vegetable rich in AsA.
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