Without exogenous CA application, the lign in content in ‘Golden Delicious’ apple peels significantly increased from 30 to 44 DAFBand then reached a plateau. However, the exogenous CA application significantly reduced lign in accumulation (Fig. 4). On the 7th dayafter spraying, the lign in content in the CA treatment was slightly lower than that of the control. On the 14th and 21st day after CA treatment, it was significantly lower than that of the control (76%and 72%, respectively). Even on the 28th day, it was still signifi-cantly lower than that of the control. It is clear that exogenous CA treatment decreased the lign in content in ‘Golden Delicious’ apple peels at young fruit stage.