| 1. The phytotron which was designed for orchard fruit, run well with nice stability, high sensitivity and rapid response speed by practice checking. It showed the great precision and advanced technology in the aspects of control algorithm, light collocation, intelligence transduce and frequency conversion and so on. The climate room was used to find out the effect of meteorological factor (temperate, light, et al) to flower-bud induction of longan, including the physiological and biochemical mechanism and specific proteins. It has great theoretical and practical significance to study the mechanism of flower-bud differentiation in longan, which helps the adjustment and control of floral bud formation and efficiency cultivation.2. The experiment showed that the diameter of fruiting cane had tremendous influence to flower branch rate in longan adult trees during the fruit formation period. Flower bud differentiation happened after Low-temperature-induced when the diameter was upon 0.7cm, but it could not happen when the diameter was less than 0.6cm. Therefore, the diameter of basal bearing shoots was the nutritive base of flower-bud differentiation.3. According to the result of phytotron-induced in longan adult trees, 6~15℃ for 30d and then 9-18℃ for 80d could lead to the flower bud differentiation. However 10~20℃ for 30d and then 15~25℃ for 80d had no flower bud, but just the branch tips. The workable moisture content of soil was 14%~18%, there were no flower bud under 10%. It was indicated that suitable low temperature (6~15℃, daily average temperature 9.75℃ for 30d) and the definite cold accumulated hours were the key factors of flower bud differentiation in Logan.
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