Table 5. Effect of Cd or Pb on activities of superoxide dismutase (SOD), catalase (CAT), and peroxidase isozyme (POD) in tall fescue.

Treatment	SOD (U min-1 mg-1 protein)	CAT (U min-1 mg-1 protein)	POD (U min-1 mg-1 protein)
CK	20.86e	80.54a	1365.89c
T1	29.15bc	46.78c	1888.30b
T2	26.30d	54.06c	1637.47b
T3	32.56a	47.39c	1702.66b
T4	27.40cd	65.23b	2438.92a
T5	30.92ab	29.91d	1984.24b

Data are expressed as the means of three replicates (n = 3). Means in a column followed by different lower-case letter for each measurement are significant using Fisher’s protected least significant difference test at P = 0.05