Effects of ETH and PP^sub 333^ on the Growth, Florescence and Physiological Properties of Bougainvillea spectabilis

【Objective】This experiment aimed to explore the effect of exogenous hormones on ornamental and physiological characteristics of Bougainvillea spectabilis, by analyzing the correlation between the flowering process and physiological and biochemical characteristics of the plants subjected to foliar-spraying ethephon（ETH） and paclobutrazol(PP333), in order to provide theoretical basis and practical guidance for more effective flowering regulation and improvement of flowering of B. spectabilis in practical production. 【Method】 The plants were sprayed on leaves with 25, 50, 75, 100, and 125 mg·L-1 ETH, and 100, 300, 500, 700, and 900 mg·L-1 PP333, and spraying water served as control. The first treatment was started on August 23, 2016, repeatedly spraying every 10 days, three times in total. The changes of ornamental characteristics during plant growth and development were observed and recorded, and at the same time, the contents of endogenous hormones, carbohydrates and soluble protein were measured. 【Result】 In