Effects of exogenous ABA and GA_3 treatments on the changes of pigments in peel of Cara cara (Citrus sinensis)

The contents of chlorophyll and carotenoid in peel of Cara cara during fruit development were determined and effects of exogenous ABA and GA3 treatments before colour break on changes of chlorophyll, carotenoid content were also investigated. The results showed that the contents of total chlorophyll and carotenoid in peel of Cara cara reached maximum on Sep.20 and Dec.20 respectively, which was 0.1469mg/g穎w and 0.0321mg/g穎w,respectively. ABA treatment accelerated chlorophyll degradation and inhibited carotenoid accumulation; GA3 treatment delayed chlorophyll degradation and inhibited carotenoid accumulation and biosynthesis seriously.