Spatial distribution and time-course of polyphenol accumulation in grape berry (Vitis labruscana cv. ‘Kyoho’)

The spatial distribution and time-course evolution of polyphenol compounds in response to exogenous light and temperature in grape berry ( Vitis labruscana cv. ‘Kyoho’) were examined. Results demonstrated that the polyphenol biosynthesis was induced via the up-regulated gene transcription levels during berry ripening. The polyphenol biosynthesis was differentially observed in skins, stems, leaves and seeds, and the more polyphenols were accumulated in seeds; and the polyphenols were significantly distributed in bottom berries of grape clusters. Additionally, the lower temperature (4 ℃) accelerated the polyphenol biosynthesis by 1.3 times after storage of 28 days, whereas the light exposure slightly inhibited the polyphenol biosynthesis of berry during storage at 25 ℃. In conclusion, the data presented in this study shed more light on deeper understanding of the spatial accumulation and time-course evolution of polyphenols in grape berry.