| In this thesis, the morphological characteristics and influence of Ethylene on flowering of Aechmea fasciate cv. Variegata, and resulting in some physiological of the floral bud differentiation in A.fasciate were studied . The results shown that:1. Based on the morphological characteristics of vegetative cone in stem apex , the progress of floral bud differentiation can be divided into six stages , including: First, Undifferentiation; Second, Inflorescence Differentiation; Third, Single Flower Differentiation; Firth, Flower Differentiation Enlargement; Fifth, Inflorescens Development; Sixth, Flower Development; The first tow stages are transition period during which A.fasciate was changed from nutrition growth to reproduction growth.2. During the first two stages, the leaves on the stem tip are in light white color,from whict could be the indirect criterion of some early flowering varieties.3. In the transition period , the quantities of GAs, IAA in the stem apex and the leaves decreased,while the quantity of iPA increased,The IAA was in the lowest level and the quatities of ZRs gradually increased to maximum. The ratio of different hormones was analyzed, where (ZRs+iPA)/GAs, (ZRs+iPA)/IAA reached maximum and IAA/GAs was lower than that in other stages. In addition , the quatities of nucleic acid, protein, sugar and ratio of RNA/DN A were also showed a similar tendency in all which have a peak value. So we though that the rapidly physiological change by the affection of the Ethylene is the main cause of the floral bud differentiation of A.fasciate.4. Under high temperature , all of ethephon-treated A.fasciate had bloomed and there is significant difference of the floral bud differentiation of A.fasciate with that at low temperature.The effects of forcing flowering are well when the concentration is 400mg/L than that of 200mg/L. It is implied that the accumulation of the carbohydrate may play a significant role during the floral bud differentiation of A.fasciate .
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