The Change of Endogenous Hormone of Apricot Tree in Flowering and Setting Period

【Objective】 In this study, by measuring the dynamic changes of three endogenous hormones in the flowering and fruit-setting period of apricot trees, the regulation mechanism of endogenous hormones during the flowering and fruit-setting period of apricot trees was discussed, so as to provide theoretical basis for the regulation and improvement of fruit-setting period in the flowering and fruit-setting period 【Methods】 The apricot plants of 10 years old trees were used as the experimental materials, and the buds, flowers and young fruits were collected at the flowering and fruiting stages, respectively. The contents of the endogenous hormones GA₃, BR and ABA were determined by enzyme linked immunosorbent assay (ELISA) 【Results】 In the apricot blossom and fruit-setting period, the content of GA₃ was the lowest in the early flowering stage, reached the peak in the late flowering stage, and then decreased. The content of endogenous hormone BR peaked at calyx stage and flowering stage, and decreased from the end of flowering stage. ABA content in flower buds was at a low level in the bulking stage, and then showed an overall upward trend. ABA content in the late flowering stage decreased after reaching a peak. The correlation between ABA and BR, ABA and GA₃, BR and GA₃ were significantly correlated. 【Conclusion】 Endogenous hormones GA₃, BR and ABA affect the process of flowering, falling and fruiting of dried apricot. The content of endogenous hormone GA₃ within the range of 194.12-511.17 pg/mL can promote the development of flower buds, and the development of young fruit requires a higher level of GA₃. Endogenous hormone BR (within the range of 125.8-153.65 ng /L) has a promoting effect on flower bud development and flower formation, and higher content of BR in early fruit-setting stage may be beneficial to the development of young fruit. ABA at low levels (72.71-105.12 g/L) may promote bud germination, ABA at high levels may promote flower opening and senescence, and ABA at low levels may promote young fruit growth and development.