The expression of PAL in the control of ‘Golden Delicious’ apple peels showed a one-peak curve with a significant increase on the 7th day and then decrease till the 28th day after application (58DAFB). CA treatment did not alter the general tendency, however,the gene expression on the 7th day after CA treatment was sig-nificantly higher than that of the control (P < 0.05). Similarly, the expressions of C4H and 4CL in the control showed a peak on the 14th day after application (44 DAFB), but the peaks in the CA treat-ment appeared on the 7th day after CA application, where the peak expressions of C4H and 4CL in the CA treatment were 20% and 24%higher than the control’s, respectively (Fig. 7). These results sug-gest that CA treatment at 30 DAFB instantaneously and significantlystimulated three gene expressions in ‘Golden Delicious’ applepeels.