Dynamic Changes of Vitamin C in Actinidia deliciosa 'Xuxiang' During Fruit Development

Abstract— Vitamin C is an important component in plants and humans. Kiwifruit was a valuable fruit with characteristic taste and flavor and high vitamin C contents. To date no studies have investigated the formation and accumulation mechanism on vitamin C in ‘Xuxiang’ kiwifruit. To elucidate the mechanism by which vitamin C accumulated of ‘Xuxiang’, we systematically investigated the gene expression profiles of the L-galactose pathway as well as the ascorbate–glutathione cycle. Our results showed that the content of vitamin C was high in “Xuxiang’ early fruit development, and then it decreased 50% during fruit division. The content of vitamin C kept about 80 mg/ 100 g when fruit developed completely. L-galactose pathway was an important route for vitamin C accumulation, which PGI1, PMM1, GMP1, GME1, GGP1, GDH1 and GalLDH1 were all important genes consist with vitamin C content