Difference in BAPAase Activity Between Cotyledon and Hypocotyl of Peanut Embryos During Developing and Germinating

During the development of peanut (Arachis hypogaea L. ) embryos, activity of BAPAase was found in the cotyledon and hypoCotyl (Fig. 1 ). When peanut seed were in the process of germination,activity of BAPAase in the cotyledon and hypeotyl increased significantly (Fig. 2). Exogenous ABA inhibited the achvity of BAPAase in the cotyledon and hypocotyl of peanut seed developing or germinationg in vitro, and concentrahon of ABA needed was fugher in the hyPOCotyl (Figs. 3, 4 ). Act-D and CHM showed no effect on the action of ABA on the achvity of BAPAase of the cotyledon of peanut seed, but they inhibited obviously the achvity of BAPAase of the hypocotyl of peanut(Fig.4 ), these resultS indicated that no nevoBAPAase was synthesized in the cotyledon, but nevo-BAPAase was probably synthesized in the hypocotyl of peanut seed.