Figure 2.

Major antioxidative enzyme activities (A) and phenotypes (B) in the cat2 mutant carrying T-DNA insertions in DHAR1, DHAR2, and DHAR3 singly or in combination. A, Extractable leaf activities of DHAR, GR, APX, and CAT after 3 weeks of growth at an irradiance of 200 µmol m⁻² s⁻¹ in a 16-h photoperiod. Data are means ± se of nine biological replicates for DHAR leaf activity and six for other enzymes. Different letters indicate significant differences at P < 0.05. ND, Not detected. B, Photographs of mutants and rosette fresh weight, determined in the same conditions as in A. For fresh weight, values are means ± se of 15 to 24 plants. Bars = 1 cm.