Table 3.

Antioxidant enzyme activity and MDA content of Impatiens New Guinea grown under two CO₂ concentration: ambient CO₂ (380 μmol·mol⁻¹) and elevated CO₂ (760 μmol·mol⁻¹).

	Ambient CO2 (380 μmol·mol−1)	Elevated CO2 (760 μmol·mol−1)	% increase	P-value
POD (U/(g∗min))	10.77 ± 2.83	23.67 ± 2.22	119.78	0.011
SOD (U/g)	527.75 ± 4.47	585.83 ± 39.51	11.01	0.141
APX ((U/(g∗min))	20.64 ± 0.88	35.76 ± 4.41	73.26	0.039
MDA (μmol/g)	0.01114 ± 0.00142	0.00433 ± 0.00062	−61.13	0.006

Values given are mean ± standard deviation. Mean values (n = 3 samples, with 5 plants per sample) were compared by Student's t-test.