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

Table 1

Relative fresh weight 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	0.33 ± 0.01^a; (0.00)	1.87 ± 0.45^a; (0.00)	2.96 ± 0.48^a; (0.00)	2.59 ± 0.17^ab; (0.00)
550	0.36 ± 0.02^a; (−7.23)	1.88 ± 0.49^a; (−0.39)	3.50 ± 0.27^a; (−18.11)	2.83 ± 0.63^ab; (−9.32)
700	0.45 ± 0.05^a; (−34.18)	1.51 ± 0.15^ab; (19.21)	3.06 ± 0.27^a; (−3.39)	2.74 ± 0.27^ab; (−5.58)
850	0.49 ± 0.09^a; (−47.54)	1.49 ± 0.15^ab; (20.37)	2.91 ± 0.46^a; (1.81)	3.38 ± 0.17^a; (−30.53)
1000	0.30 ± 0.09^a; (8.72)	0.69 ± 0.12^b; (62.93)	2.59 ± 0.21^a; (12.48)	2.32 ± 0.14^b; (10.37)

Values are the means ± SE of three replications. Variants possessing the same letters are not statistically significant at 5% probability level. Values in parenthesis are relative inhibition (% relative inhibition = 1 − mean values in treatment/mean values in respective control * 100). −ve values show increase and +ve values show decrease over the related controls.