Studies on the Characteristics of the Growth and Development of Petuniahybrida ‘Fantasy Pink’under Two Kinds of Photoper iod Relationship between the Flower Nodes and Changes of Endogenous Hormones in Grape Seedlings Relationship between the Flower Nodes and Changes of Endogenous Hormones in Grape Seedlings Studies on Juvenility and Limited Inductive Photoperiod of Petunia hybrida‘Fanta sy’ Studies on the Characteristics of the Growth and Development of Petuniahybrida ‘Fantasy Pink’under Two Kinds of Photoper iod