In this study, Vitis vinifera cv. Thompson Seedless and its natural variations were used as materials to investigate fruit characteristics, including grape polyphenols such as resveratrol and polyphenol oxidase(PPO) activities. Moreover, the natural heat and light stress on photosynthesis characteristics were studied to evaluate the bio-ecological characteristics of different clones in the field cultivation conditions in Shanshan of Xinjiang. Grape bunch treatment of V. vinifera cv. Thompson Seedless was al...