Table 1.

Zn and Cd translocation factors

Genotype	Zn translocation factor		Cd translocation factor
WT	1.31a	± 0.25	0.83a	± 0.18
p35S::ScZRC1 #1	2.47b	± 0.05	0.7a,b	± 0.02
p35S::ScZRC1 #2	2.43b	± 0.29	0.59a	± 0.44
p35S::ScZRC1 #3	2.52b	± 0.23	0.91a	± 0.54
pRbcs::ScZRC1 #1	2.18c	± 0.03	0.57a,b	± 0.10
pRbcs::ScZRC1 #2	2.13b,c	± 0.57	0.95a	± 0.40
pRbcs::ScZRC1 #3	2.04c	± 0.02	0.85a	± 0.34

Zn and Cd translocation factors (means ± SD) were calculated as the ratio between metal concentration in shoots and metal concentrations in roots of poplar plants (three lines each transgenic genotpye indicated as #1, #2 and #3) grown in mesocosmos pots filled with an artificially contaminated soil substrate (10 mg kg⁻¹ CdSO₄ and 300 mg kg⁻¹ ZnSO₄). The translocation factor is a measure for the effectiveness of the root-to-shoot transport of a metal ion. Different letters (a, b, c) within a column indicate significant differences among the genotypes (P < 0.05, n = 5)