摘要：

Through the inter-transferring with flower-induction and vegetative bud-induction medium, the critical period of floral differentiation in the decapitated seedlings of cucumber was founded to be the 5~6 th day after culture (3~4 th day after decapitation). The results of changes of endogenous hormone contents at early stage of floral differentiation in cotyledonary nodes of cucumber seedlings after decapitation were as follows: The contents of IAA and ZT in cotyledonary nodes of the cucumber seedlings within 0~4 d after decapitation decreases while the level of GA_3 first increases then declines within 1~3 d, after that it increases again. The ratio of ZT/IAA increases within 0~2 d and drops rapidly on the 3 rd day, then goes up to the peak on the 4 th day. The change of GA_3/IAA ratio is similar as ZT/IAA. Based on these results, the relationship between these physiological changes and the floral bud differentiation was discussed.

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