Table 3.

Glutathione reductase (GR) activity (mU g⁻¹ fresh weight) in leaves and roots of Arabidopsis thaliana plants grown under control conditions (0 µM CdSO₄) or exposed to 5 μM CdSO₄ during 2 h, 4 h, 6 h and 24 h after 3 weeks of growth. For each time point, data represent the mean ± S.E. of four biological independent replicates. Significant differences (t-test: p < 0.05) between control and exposed plants, within each time point, are marked in colour (increased: , increased: ).

GR activity (mU g−1 FW)
[CdSO4]	2 h	4 h	6 h	24 h
Leaf
0 µM	64.46 ± 1.75	68.08 ± 0.08	65.33 ± 0.93	57.02 ± 1.55
5 µM	64.52 ± 0.86	65.70 ± 1.94	70.48 ± 1.53	69.70 ± 4.62
Root
0 µM	33.82 ± 1.01	32.23 ± 1.67	31.50 ± 1.26	30.56 ± 0.11
5 µM	30.16 ± 0.86	29.60 ± 0.74	30.91 ± 0.57	39.05 ± 0.93