TABLE 2.
Iron concentration (μg/g DW) in old and new leaves and Fe/Mn ratio in roots and old and new leaves of cucumber plants under different Fe treatments [21 days Fe sufficiency (+Fe), 10 days of sufficiency + 7 days of Fe deficiency (−Fe), and 5 days more of refertilization with 57Fe ((−Fe) + Fe)] and Si treatments [Si applied to root (+SiR), leaves (+SiF), and no Si (−Si) application].
| +SiR | +SiF | (−Si) | |
| Fe concentration(μ g g-1) | |||
| Old leaves | |||
| +Fe | 88.9 ± 2.9b | 99.8 ± 5.6ab | 104.1 ± 1.1a |
| (−Fe) | 42.8 ± 3.7b | 64.5 ± 6.7a | 65.4 ± 3.6a |
| (−Fe)+Fe | 103.0 ± 6.3b | 151.6 ± 9.0a | 110.0 ± 8.10b |
| New leaves | |||
| +Fe | 109.9 ± 12.7b | 167.8 ± 7.8a | 121.9 ± 9.2ab |
| (−Fe) | 41.4 ± 13.4b | 60.8 ± 3.1ab | 80.9 ± 13.0a |
| (−Fe)+Fe | 140.3 ± 12.2a | 113.8 ± 5.9a | 134.2 ± 7.0a |
| Fe/Mn | |||
| Old leaves | |||
| +Fe | 0.653 ± 0.113b | 0.569 ± 0.040b | 0.798 ± 0.085a |
| (−Fe) | 0.419 ± 0.037b | 0.650 ± 0.199a | 0.698 ± 0.146a |
| (−Fe) +Fe | 0.853 ± 0.064a | 1.083 ± 0.045a | 0.970 ± 0.274a |
| New leaves | |||
| +Fe | 0.900 ± 0.080b | 1.157 ± 0.186a | 1.260 ± 0.017a |
| (−Fe) | 0.637 ± 0.162b | 0.653 ± 0.137b | 1.144 ± 0.091a |
| (−Fe)+Fe | 1.573 ± 0.170a | 1.120 ± 0.617a | 1.247 ± 0.032a |
| Root | |||
| +Fe | 0.997 ± 0.081b | 1.367 ± 0.251a | 1.125 ± 0.232ab |
| (−Fe) | 1.646 ± 0.039a | 1.266 ± 0.210b | 1.540 ± 0.109a |
| (−Fe)+Fe | 1.077 ± 0.025a | 1.033 ± 0.078a | 0.960 ± 0.080a |
The data are the mean ± SE (n = 3). Different letters in the same row showed significant differences according to Duncan’s test (p < 0.05).