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. 2019 Jun 4;10:739. doi: 10.3389/fpls.2019.00739

FIGURE 4.

FIGURE 4

Defense chemical components of Ostrinia furnacalis feeding on maize grown under different levels of CO2 and nitrogen fertilization conditions (mean ± SE, n = 3). (A) Trypsin activity, (B) total protease activity, (C) amylase activity, (D) lipase activity, (E) catalase (CAT) activity, (F) peroxidase (POD) activity, and (G) superoxide dismutase (SOD) activity.