Abstract:With the fluorescent lamp (16 mm diameter) as light source to set up four supplementary treatments, including dark (T0) and low (T1), medium (T2) and high (T3) light intensities, we simulated a one-month of storage of Bougainvillea spectabilis willd "Crimsonlake", and measured the defoliation rate, photosynthetic pigment content, cell membrane permeability, antioxidant enzyme activity and other related physiological and biochemical indexes of leaves, so as to study the effect of supplementary treatments on the leaves of Bougainvillea and provide the basis for solving the serious defoliation problem during storage and transportation of Bougainvillea spectabilis Willd. The results showed that: (1) on the 28th day of simulated storage, the defoliation of T0 and T3 treatments was serious, reaching over 87%, and the defoliation rates of T1 and T2 treatments were significantly lower than T0 and T3 treatments, only 16.33% and 16.92%; The specific leaf weight of T1~T3 treatments is higher than that of T0 treatments, and the relative water content is lower than that of T0 treatments. (2) The relative conductivity, MDA content, soluble protein content of T1 and T2 treatments are significantly lower than that of T0 treatments. (3) The content of chlorophyll a, chlorophyll b, total chlorophyll and carotenoid in leaves of T0, T2 and T3 treatments increased first and then decreased, while that of T1 treatment showed an upward trend with small changes. (4) During the whole storage and transportation period, the activities of superoxide dismutase (SOD) in the leaves showed a gradual increase, while the activities of catalase (CAT) and peroxidase (POD) increased first and then decreased. There was no significant difference in the CAT activity of leaves between T0, T1 and T2 treatments. POD activity of leaves treated with T1 and T2 was significantly higher than that treated with T0. On the 28th day, the SOD activity in the leaves of T2 treatments was significantly higher than that of T1 treatments, which increased by 60.86% and 45.02%, respectively, compared with the 0th day. The research indicated that the light intensity of 9.45 μmol?m-2?s-1, i.e. a fluorescent lamp, could be used to compensate light for 8 h?d-1 on the Bougainvillea during storage, which could reduce damages of the cell membrane and influences of the photosynthetic pigment caused by the dark stress in the process of storage. It was beneficial to reduce the wastage of photosynthetic product in the leaves and the yellowing of the leaves, so that the Bougainvillea could grow normally during storage to reduce economic losses.