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

Table 7

POD activity (OD470 g⁻¹FW/min) 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	75.96 ± 5.10^a; (0.00)	52.77 ± 1.98^c; (0.00)	15.50 ± 0.88^a; (0.00)	17.63 ± 1.07^a; (0.00)
550	54.47 ± 1.94^b; (28.30)	57.80 ± 3.77^cd; (−9.54)	14.13 ± 0.29^a; (8.82)	13.37 ± 0.04^c; (24.20)
700	60.63 ± 1.31^b; (20.18)	61.72 ± 0.22^c; (−16.96)	14.27 ± 0.21^a; (7.96)	15.10 ± 0.04^b; (14.37)
850	66.44 ± 5.31^ab; (12.54)	79.73 ± 2.71^b; (−51.11)	14.53 ± 0.42^a; (6.24)	16.13 ± 0.12^ab; (8.51)
1000	57.54 ± 6.97^b; (24.25)	93.63 ± 3.50^a; (−77.45)	16.10 ± 1.40^a; (−3.87)	14.63 ± 0.10^bc; (17.02)

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.