In Vitro Cadmium-Induced Alterations in Growth and Oxidative Metabolism of Upland Cotton (Gossypium hirsutum L.)

Table 5

SOD activity (Ug⁻¹FW) of cotton callus culture (cv. YZ1) grown under various levels of cadmium.

Cd treatment (µM)	Stress periods
	7 days	14 days	21 days	28 days
0	319.51 ± 25.74^a; (0.00)	360.76 ± 40.14^a; (0.00)	433.14 ± 70.17^ab; (0.00)	372.77 ± 9.67^a; (0.00)
550	326.98 ± 54.95^a; (−2.34)	414.35 ± 25.90^a; (−14.85)	305.76 ± 12.09^bc; (29.41)	239.03 ± 55.04^b; (35.88)
700	406.67 ± 7.47^a; (−27.22)	332.49 ± 39.79^a; (7.84)	230.37 ± 24.18^c; (46.81)	230.37 ± 12.09^b; (38.20)
850	358.63 ± 64.60^a; (−12.24)	350.64 ± 25.52^a; (2.81)	443.58 ± 74.44^ab; (−2.41)	322.51 ± 7.25^ab; (13.48)
1000	372.99 ± 21.72^a; (−16.74)	393.36 ± 38.98^a; (−9.03)	509.30 ± 44.76^a; (−17.58)	371.59 ± 67.72^a; (0.32)

Values are the means ± SE of three replications. Variants possessing the same letters are not statistically significant at 5% probability level. Other pieces of information are the same as in Table 1.