Table 1.
SPAD values, leaf chlorophyll (Chl) and iron leaf and stem concentrations of U. laevis and U. minor seedlings 6 weeks after Fe-resupply.
| Species | Treatment | Mean aerial part DW (g) | Leaf |
Stem | ||
|---|---|---|---|---|---|---|
| Δ SPAD | [Fe] (mg Kg-1) | Total [Chl](mg cm-2) | [Fe] (mg Kg-1) | |||
| U. laevis | 0 μM Fe | 0.10 ± 0.02 a | -6.4 ab | 21.0 ± 0.4 a | 0.08 | 6.2 ± 0.1 b |
| 1 μM Fe | 0.47 ± 0.13 b | 14.4 c | 23.8 ± 5.8 ab | 1.98 | 8.1 ± 0.2 bc | |
| 5 μM Fe | 1.95 ± 0.30 c | 29.6 d | 37.0 ± 3.6 bc | 2.73 | 10.8 ± 1.3 c | |
| 20 μM Fe | 2.07 ± 0.51 c | 28.4 d | 60.3 ± 2.7 d | 3.01 | 13.7 ± 1.0 cd | |
| U. minor | 0 μM Fe | 0.23 ± 0.15 a | -10.5 a | 10.8 ± 0.2 a | 0.13 | 4.3 ± 0.1 a |
| 1 μM Fe | 0.34 ± 0.18 a,b | -2.6 b | 11.9 ± 0.1 a | 0.70 | 9.0 ± 0.2 c | |
| 5 μM Fe | 2.81 ± 1.57 c,d | 16.3 c | 38.8 ± 2.3 bc | 2.12 | 9.9 ± 0.8 c | |
| 20 μM Fe | 1.23 ± 0.35 c | 16.2 c | 44.9 ± 1.5 c | 2.19 | 15.0 ± 0.9 d | |
The headings correspond to: mean aerial part dry weight (DW; g), Δ SPAD (SPAD increment of Week 6 – Week 0; n = 12), total leaf [Chl], and leaf and stem [Fe] (mg kg-1DW; means ± SE; n = 7). Letters correspond to Tukey’s HSD 95% homogeneous groups.