【摘要】 ‘荸荠种’杨梅小年树花芽孕育初期 ,苯丙氨酸解氨酶 (PAL)活性首先达到高峰 ;之后多酚氧化酶 (PPO)活性出现高峰。花芽孕育盛期过氧化物酶 (POD)活性达到高峰 ,且与木质素积累到最大值相一致。花芽发端期间 ,POD活性和木质素水平均降低。GA3处理降低了花芽孕育期间PAL、PPO和POD的活性 ,导致木质素合成滞缓 ,抑制花芽发端和降低成花率更多还原

【Abstract】 Off year trees of‘Biji’bayberry were used to determine the effects of GA 3 spraying on lignin level and its correlated enzymes’activities 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 level of lignin increased to maximum.During the period of flower initiation,both the activity of POD and the content of lignin decreased.The treatment with GA 3 spraying inhibited the activities of PAL,PPO and POD,slowed down the biosynthesis of lignin,surppressed the differentiation of flower buds and almost completely prevented the formation of flower bud.We concluded that GA 3 might inhibit the formation of flower bud by dropping down the accumulation of lignin.更多还原