502
Figure 21.5.Oxidative pentose phosphate pathway in plants. NADPH generated from the pentose phosphate path-
way is channeled into the antioxidant enzyme system, where the regeneration of oxidized intermediates requires
NADPH. Key: GSH, reduced glutathione; GSSG, oxidized glutathione; ASA, reduced ascorbate; MDHA, monodehy-
droascorbate; DHA, dehydroascorbate; GR, glutathione reductase; DHAR, dehydroascorbate reductase; MDHAR,
monodehydroascorbate reductase; SOD, superoxide dismutase; CAT, catalase; POX, peroxidase; APX, ascorbate
peroxidase.