highly significantp < 0.01
CAT showed a highly significant positive correlation with Pro, SS, GSH, flavonoids, and polyphenols ( p < 0.01), and a significant positive correlation with ASA ( p < 0.05).
CAT showed a highly significant positive correlation with Pro, SS, GSH, flavonoids, and polyphenols ( p < 0.01), and a significant positive correlation with ASA ( p < 0.05).
Except for the CK group, the yellow leaf rate and defoliation rate of the other treatment groups showed a trend of first decreasing and then increasing with the increase of CaCl 2 concentration, and all showed significant differences from CK ( p < 0.05).
The results, as shown in Figure 1 , indicate that the SOD, POD and CAT activity of different concentrations of CaCl 2 treatment groups showed an overall trend of first increasing, and then decreasing, under heat stress.