FIGURE 5.

Activities of antioxidant enzymes SOD, CAT and POD in WT and ZmpsbA- transgenic lines. Four weeks old WTand transgenic plants were drought-stressed for 7 days, and then the leaf samples were taken and used to detect activities of SOD, CAT, and POD. (A) SOD activity; (B) CAT activity; (C) POD activity. Data are means ± SE calculated from three replicates. Different letters indicate a significant difference between the WT and both transgenic lines (ANOVA; P < 0.05). Three independent experiments were performed, which produced similar results.