Catalases CAT1 and CAT3 Are not Key Enzymes in Alleviating Gamma Irradiation-Induced DNA Damage,H2O2 Accumulation,or Lipid Peroxidation in Arabidopsis thaliana

Gamma irradiation increased catalase activities at 0.1 kGy and decreased them at 10 kGy in Arabidopsis wild type and catalase-deficient mutants, cat3-1 and cat1 cat3. Irradiation induced DNA damage, H₂O₂ accumulation, and lipid peroxidation in both mutants as well as the wild type. Thus catalases might not be key enzymes protecting gamma irradiation-induced damage.