Table 2.

Amount of copper in tobacco organs; BCF and TF after the long-term substrate treatment with 100 and 300 μM CuSO₄.

Treatment	Copper Amount, µg g−1 DW			BCF			TF
	Root	Stem	Leaf	Root	Stem	Leaf	Stem/Root	Leaf/Root
Control (Knop solution)	31.36 ± 1.09 1	14.84 ± 0.56	9.52 ± 0.44	1.11	0.53	0.34	0.47	0.30
100 μM CuSO4	723.24 ± 39.78 *	31.08 ± 1.31 *	27.44 ± 1.26 *	2.28	0.10	0.09	0.04	0.04
300 μM CuSO4	810.88 ± 32.43 *	44.80 ± 2.46 *	33.21 ± 1.86 *	1.01	0.06	0.04	0.06	0.04

¹ Results are presented as mean ± standard error (n = 5). * represent significant differences (p < 0.05, U-test) from control.