TABLE 3.
Total phenol concentration (mmol gallic acid/g FW) and MDA (nmol/g FW) in 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) | |
| Total phenols (mmol galic acid/g FW) | |||
| Old leaves | |||
| +Fe | 12.9 ± 6.2ab | 13.4 ± 4.0ab | 17.4 ± 6.7a |
| (−Fe) | 36.7 ± 6.2a | 31.9 ± 6.0ab | 29.1 ± 7.0b |
| (−Fe)+Fe | 20.8 ± 4.7b | 25.1 ± 3.2a | 19.5 ± 2.3b |
| New leaves | |||
| +Fe | 34.0 ± 4.9a | 27.8 ± 5.5b | 28.5 ± 3.1b |
| (−Fe) | 30.0 ± 4.0a | 39.4 ± 8.9a | 34.7 ± 8.7a |
| (−Fe)+Fe | 22.9 ± 4.2a | 21.0 ± 3.6a | 16.8 ± 3.5a |
| MDA (nmol/g FW) | |||
| Old leaves | |||
| +Fe | 19.58 ± 6.37a | 21.59 ± 1.95a | 16.30 ± 3.79a |
| (−Fe) | 7.80 ± 0.25b | 12.74 ± 2.95a | 8.91 ± 3.31ab |
| (−Fe)+Fe | 19.01 ± 3.52a | 19.36 ± 2.73a | 11.20 ± 2.09a |
| New leaves | |||
| +Fe | 18.68 ± 1.94a | 17.62 ± 2.31a | 12.47 ± 3.64a |
| (−Fe) | 9.97 ± 3.46a | 5.56 ± 1.23b | 5.99 ± 0.69b |
| (−Fe)+Fe | 15.08 ± 2.04a | 13.12 ± 1.97a | 9.15 ± 2.11b |
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).