Effects of Gibberellin3 on Leaf Lignin levels，Related Enzymes and Flower Form ation in Bayberry
Off-year trees of'Biji'bayberry were used to determ ine the effects of GA3 spraying on lignin level and its correlated enzymes'ac tivities in leaves during the period of flower bud physiological differentiation .At the initial stage of flower bud physiological differentiation，the activity of PAL increased to maximum，then followed by the activity of PPO.At the peak of flower bud physiological differentiation，both the activity of POD and the leve l of lignin increased to maximum.During the period of flower initiation，both th e activity of POD and the content of lignin decreased.The treatment with GA3 s praying inhibited the activities of PAL，PPO and POD，slowed down the biosynthes is of lignin，surppressed the differentiation of flower buds and almost complete ly prevented the formation of flower bud.We concluded that GA3 might inhibit t he formation of flower bud by dropping down the accumulation of lignin.
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