Abstract: Rosa roxburghii Tratt ‘Guinong 5’ was used to investigate the co-changes of antioxidant enzymes activity and ascorbic acid contents in fruits and leaves during the development. The results showed that the high activity of SOD presented in both fruits and leaves, and basically with a parallel pattern during the development. The high activities of POD and CAT and low ascorbate content, which increased at the early developmental stage but decreased later in leaves. By comparison, the fruit had a remarkable characteristics of extreme richness of both SOD and ascorbic acid although transitory and weak POD and no CAT activity was detected during the fruit development. These data revealed that different ROSscavenging mechanisms cooperating in the fruits and leaves of this plant.

Key words: Rosa roxburghii Tratt, Ascorbic acid, Antioxidant system, Co-change