关键词: 白兰花, 多效唑, 脱落酸, 内源激素, 光合特性

Abstract: Michelia alba, with a high height and few flowers in blooming period, is not good for cultivation in house. To overcome these disadvantages, Michelia alba were treated with paclobutrazol and ABA in various ways, such as soil application, foliage spraying, and used to detect the height, blossom condition, phytohormones concentrations and photosynthetic efficiency in different positions of plant. The results showed that the concentration of phytohormones, such as IAA, GA3, Z, ZR and ABA,displayed different regularity of change, and the photosynthesis rate changed obviously after treatments. The plants treated was short and small, flowering early, and the amount of flowers and flowering frequency increased. Soil application and foliage spraying of paclobutrazol and ABA were found the best way to dwarf the height of Michelia alba to 40%～50% of CK, and increase the amount of flowers 2.3 times of CK.

Key words: Michelia alba, paclobutrazol, ABA, blossom, photosynthetic rate