3.3.2. NI

The changes in NI activity are shown in Figure 2b. The change trend of the enzyme activity in the high-Ca treatment group decreased only at 71 d after anthesis, and the enzyme activity in the CK group experienced two increases and decreases. However, the NI activity in the high-Ca treatment group was significantly higher than that in the CK group at 77 d after anthesis and was significantly lower than that in the CK group overall, indicating that the high-Ca treatment had an obvious inhibitory effect on the accumulation of reducing sugars in the fruit pulp.
