Abstract: The contents of endogenous hormones ( including GA₃ , GA_{4 + 7} , IAA, ABA, ZR and iPA) were analyzed with the method of EL ISA in different buds which located different nodes of two-year-old Kyoho grape seedings, and the lowest inflorescence nodes were investigated. The results revealed that the reproductive phase appeared at about 20th node. The contents of GA₃ and GA_{4 + 7} decreased, the ABA content increased sharply during the process of phase change, but the content of ABA was so low that itwas hardly been detected at the nodes 31 - 35th ; the ratio of ABA /GA₃ and ABA /GA_{4 + 7} varied slightly at the nodes 16 - 20th , but after that rose obviously. So we concluded that the ratio obviously reflected the relationship between variations of hormones contents and phase change than simplex variations of hormones contents.

Key words: Vitis vinifera L., Endogenous hormone, Juvenility, Flower node