Abstract: Ziziphus jujuba cv. Dongzao , light embryo abortion cultivar and Ziziphus jujuba cv. Lizao , high embryo abortion cultivars were employed to determine endogenous hormone of pulp and seed by using HPLC. The results showed that : content of zeatin (Z) in the pulp of Lizao within 20 days after fruit set was higher than that in the pulp of Dongzao , so did the content of GA3 and IAA within 30 days after fruit set ; ABA in the pulp of Lizao was found earlier than that of Dongzao. In Dongzao , Z content of seed was much higher than pulp which reached peak 20 d after fruit set , GA3 content of Dongzao seed kept low all along. IAA content of Dongzao seed reached peak 40 d after fruit set , and kept high level after that , much higher than pulp of Dongzao ; IAA/ GA3 , IAA/ Z kept low within 55 , 40 days separately after fruit set , but raised very fast after that . Three growth hormones in the pulp of seedless fruit were higher than seeded fruit Z , GA3 and IAA content in the pulp of seedless fruit were higher than seeded fruit in Lizao 10 d after fruit set . The high Z , GA3 and IAA level in pulp were unfavorable for embryo development , but high Z and IAA level in embryo were favorable for embryo development .

Key words: Chinese jujube, Dongzao, Lizao, Fruit growth, Pulp, Seed, Endogenous hormone, Embryo abortion