Table II.
Simultaneous uptake of Cd and Zn and uptake of Fe in the two ecotypes of T. caerulescens and their response to Fe deficiency
| Ecotype | Cd | Zn | Cd/Zn | Fe |
|---|---|---|---|---|
| nmol g root fresh wt−1 h−1 | nmol g root fresh wt−1 h−1 | |||
| Ganges + Fe | 115.1 (8.1) | 92.4 (11.6) | 1.24 | 1,525 (237) |
| Ganges − Fe | 145.0 (7.5) | 95.4 (7.2) | 1.52 | 2,047 (99) |
| Prayon + Fe | 51.6 (4.1) | 82.3 (6.1) | 0.62 | 1,170 (195) |
| Prayon − Fe | 65.8 (5.3) | 95.9 (14.9) | 0.68 | 1,373 (95) |
Iron deficiency was induced for 6 d. For the Cd and Zn uptake experiment, the plants were transferred to uptake solutions containing 10 μm of radiolabelled CdCl2 and ZnCl2. The short-term uptake of 59Fe was determined by transferring the plants to an uptake solution containing 50 μm 59Fe-EDDHA. In both experiments, the uptake period was 20 min. ses are reported in parentheses; n = 4 for Cd and Zn, n = 5 for Fe.