Figure 7.

CAT, GR, and APX Activities in CMSII and Wild-Type Plants throughout the Day/Night Cycle.

The white horizontal bar indicates the light period, and the black horizontal bar indicates the dark period. Open columns indicate the wild type, and closed columns indicate CMSII. Values are means ± se from three to six independent experiments.

(A) Total CAT activity (μmol H₂O₂·min⁻¹·mg⁻¹ protein).

(B) Total GR activity (μmol NADPH oxidized·min⁻¹·mg⁻¹ protein).

(C) Total APX activity (nmol ascorbate oxidized·min⁻¹·mg⁻¹ protein).

(D) Ascorbate depletion-insensitive APX (nonchloroplastic APX) activity (nmol ascorbate oxidized·min⁻¹·mg⁻¹ protein).