Changes in endogenous hormones levels of young fruit of‘Dangshansuli'pear during calyx abscission processes

‘Dangshansuli'pear was used as material to study the relationship between calyx abscission and endogenous hormones content. The contents of IAA,GA3and ABA in fruit core and calyx abscission layer of fruit tip were determined by high performance liquid chromatography( HPLC). The results showed that the content of IAA was higher in the early stage of fruit development,and then went down,while the content of GA3was higher for calyx persistent fruits and ABA for calyx abscission fruits. It suggested that calyx abscission was controlled by several endogenous hormones together. Lower content of IAA,GA3in calyx abscission layer of fruit tip and fruit core,and higher content of ABA in calyx abscission layer of fruit tip were beneficial to the abscission of calyx,oppositely,were beneficial to the existence.