Abstract:

IAA, GA₃, KT and ABA play an important role in regulating and controlling the growth and development of Phyllostachys heterocycla cv.pubescens.With the help of high-performance liquid chromatography, the content and distribution of the above hormones in leaves, culms, rhizomes and current healthy shoots of the 1~6-year-old bamboo were studied during the period of shoot emergence.The results showed that the contents of IAA, GA₃, and KT promoting plant growth and cell division are high in bamboo plant on-year, which are low off-year.And the content of IAA in bamboo plant decreases with the increase of ages.The contents of ABA inhibiting plant growth in bamboo foliage and stem are lower in on-year, which are higher in off-year. The contents of 4 endogenous hormones in foliage are higher, the distribution law of GA₃ is foliage>rhizome>stem, that of KT is rhizome>foliage>stem, both IAA and ABA are foliage>stem>rhizome. The content of IAA in bamboo foliage increases basipetally, while that of ABA in foliage and stem decreases basipetally. The metabolism of bamboo stems grown on the same rhizome and rhizome system have a relative independence, therefore it is possible to regulate on-year and off-year of bamboo by the remaining and cultivating in off-year.

Key words: Phyllostachys heterocycla cv.pubescens, Endogenous hormone