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

Table 8

APX activity (µMg⁻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	18.16 ± 1.42^a; (0.00)	12.74 ± 1.13^b; (0.00)	48.21 ± 1.49^a; (0.00)	49.49 ± 1.94^bc; (0.00)
550	9.72 ± 1.09^c; (46.44)	8.14 ± 0.62^c; (36.11)	48.00 ± 0.62^a; (0.44)	47.59 ± 1.75^c; (3.85)
700	12.64 ± 1.82^bc; (30.39)	17.06 ± 1.61^a; (−33.87)	49.50 ± 1.45^a; (−2.67)	50.36 ± 0.49^bc; (−1.75)
850	16.76 ± 0.85^ab; (7.70)	10.07 ±0.50^bc; (20.98)	47.14 ± 3.34^a; (2.22)	58.76 ± 2.01^a; (−18.72)
1000	13.29 ± 2.60^abc; (26.84)	3.85 ± 0.64^d; (67.32)	47.80 ± 1.44^a; (0.85)	53.41 ± 0.92^b; (−6.51)

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.