Abstract:

The endophytohormones in the rhizomal buds of Phyllostachys praecox were tested monthly by ELISA. The results showed that the endophytohormones such as IAA, ZT and iPA in one-year-old rhizomal buds had the similar changes which fluctuated monthly, however the changes of ABA gave the opposite pattern. IAA, ZT and iPA arose one month earlier in spring at the top of the one-year-old rhizomal buds than at the bottom. When the coverage used, the buds at the bottom produced high level of IAA, ZT and iPA one month earlier than those non-coverage used. In July when buds on the top of rhizome developed a new rhizome, the ZT and iPA got lower and IAA kept high; ABA was much high in the buds at the bottom, however it was quite lower at the top. So the formation of the shoots and the rhizome were great relative with the changes of endophytohormones. IAA/ABA was relative with the activity of buds. ZT/ABA and iPA/ABA was relative with the formation of shoots. The biological mechanism of producing shoots earlier by using covering method was also discussed.

Key words: Phyllostachys praecox, Rhizomal bud, Endophytohormone, Coverage