Cadmium-Induced Upregulation of Lipid Peroxidation and Reactive Oxygen Species Caused Physiological, Biochemical, and Ultrastructural Changes in Upland Cotton Seedlings

Table 5

Antioxidants status in different parts of cotton seedlings upon their exposure to Cd stress for 24-hour duration.

Antioxidants	Parts
	Roots		Stems		Leaves
	0 µM Cd	500 µM Cd	0 µM Cd	500 µM Cd	0 µM Cd	500 µM Cd
SOD (U/mg protein)	275.25 ± 1.69^b; (0.00)	324.67 ± 6.13^a; (17.95)	267.13 ± 8.21^a; (0.00)	284.50 ± 1.94^a; (6.50)	255.82 ± 21.26^b; (0.00)	344.92 ± 5.09^a; (34.83)
APX (µM/min/mg protein)	0.51 ± 0.17^a; (0.00)	0.41 ± 0.24^a; (−20.04)	1.43 ± 0.95^a; (0.00)	0.37 ± 0.10^a; (−74.50)	3.31 ± 0.16^a; (0.00)	1.84 ± 0.35^a; (−44.43)
CAT (µM/min/mg protein)	0.030 ± 0.02^a; (0.00)	0.035 ± 0.01^a; (12.37)	0.11 ± 0.02^a; (0.00)	0.02 ± 0.010^b; (−83.17)	0.21 ± 0.010^a; (0.00)	0.57 ± 0.02^a; (169.09)
POD (µM/min/mg protein)	7.48 ± 0.69^a; (0.00)	4.93 ± 0.33^b; (−34.09)	2.62 ± 0.13^b; (0.00)	3.72 ± 0.15^a; (41.85)	5.07 ± 0.14^b; (0.00)	8.03 ± 0.39^a; (58.26)
GR (µM/min/mg protein)	0.22 ± 0.03^a; (0.00)	0.03 ± 0.08^a; (−85.10)	0.05 ± 0.02^b; (0.00)	0.18 ± 0.02^a; (244.76)	0.17 ± 0.02^b; (0.00)	0.27 ± 0.03^a; (54.59)

Values are the means ± SE of three replications. Variants possessing the same letter are not statistically significant at P < 0.05. Values in parenthesis show percent relative increase (+) or decrease (−) over the related controls.