Table 2.
Concentrations of macro- (N, P, Ca, Mg, and K; in % DW) and microelements (Fe, Mn, Cu, and Zn; in μg g−1 DW) in basal and distal parts of Fe-deficient sugar beet leaves either not fertilized or 7 days after the first treatment with 2 mM FeSO4 and 0.1% surfactant.
| Basal leaf part | Distal leaf part | |||||
|---|---|---|---|---|---|---|
| Not fertilized | Fe-fertilized* | Green, Fe-sufficient | Not fertilized | Fe-fertilized | Green, Fe-sufficient | |
| N | 3.54 ± 0.32a | 3.33 ± 0.16a | 4.00 ± 0.42a | 3.69 ± 0.12B | 3.24 ± 0.16B | 5.34 ± 0.13A |
| P | 0.28 ± 0.03b | 0.25 ± 0.03b | 0.74 ± 0.07a | 0.34 ± 0.04B | 0.19 ± 0.02B | 1.04 ± 0.28A |
| K | 4.30 ± 0.17a | 4.89 ± 0.28a | 4.40 ± 0.06a | 4.78 ± 0.41A | 4.97 ± 0.43A | 4.93 ± 0.31A |
| Ca | 5.77 ± 0.16b | 6.73 ± 0.36a | 2.08 ± 0.08c | 6.69 ± 0.54A | 7.43 ± 0.55A | 2.09 ± 0.08B |
| Mg | 2.02 ± 0.21ab | 2.42 ± 0.19a | 1.81 ± 0.06b | 2.13 ± 0.25A | 2.75 ± 0.29A | 2.16 ± 0.08A |
| Fe | 104.3 ± 16.0a | 135.3 ± 14.8a | 151.1 ± 22.7a | 145.8 ± 11.7B | 207.0 ± 15.0AB | 265.0 ± 48.4A |
| Mn | 73.5 ± 13.4a | 111.4 ± 18.2a | 126.1 ± 20.4a | 135.9 ± 23.0B | 161.5 ± 8.0B | 226.2 ± 13.4A |
| Cu | 13.4 ± 1.9ab | 10.6 ± 1.5b | 17.7 ± 2.8a | 19.0 ± 3.6B | 9.6 ± 1.5C | 34.4 ± 5.8A |
| Zn | 27.6 ± 1.9b | 18.5 ± 1.5b | 61.5 ± 11.2a | 23.6 ± 1.5AB | 20.8 ± 1.5AB | 110.4 ± 12.3A |
The elemental concentrations of leaves from green, Fe-sufficient plants are also included for comparison. Data are means ± SE (n = 8 plants, 4 in each of two different batches; each sample was composed of two leaves from the same plant). Values followed by the same letter within the same row were not significantly different (Duncan test) at the p ≤ 0.05 level. Columns with data corresponding to Fe-fertilized leaves are labeled “Fe-fertilized” in case of the treated (distal) leaf area and “Fe-fertilized
” in case of the (basal) untreated area.