Table 8.
Foliar application of some growth regulators (e.g., gibberellic acid; GA3 and diluted bee honey; Db-H) promoted plant hormonal contents of Vicia faba plants grown under well watering (100% of crop evapotranspiration; ETc) or deficit irrigation (60% of ETc).
| Source of Variation | Indole-3-Acetic Acid (µg per g FW) | Gibberellic Acid (µg per g FW) | Cytokinins (µg per g FW) | Abscisic Acid (µg per g FW) |
|---|---|---|---|---|
| Season of 2018/2019 | ||||
| Irrigation (Ir) | * | * | * | * |
| 100% of ETc | 18.1 ± 0.15a | 33.1 ± 0.29a | 24.6 ± 0.18a | 4.23 ± 0.05b |
| 60% of ETc | 14.2 ± 0.14b | 25.1 ± 0.26b | 18.4 ± 0.16b | 6.29 ± 0.06a |
| Regulators (Re) | * | ** | * | * |
| Control (Cn) | 12.2 ± 0.10c | 18.5 ± 0.20c | 15.5 ± 0.13c | 7.43 ± 0.07a |
| GA3 | 16.0 ± 0.15b | 41.9 ± 0.40a | 22.0 ± 0.18b | 4.45 ± 0.05b |
| Db-H | 20.4 ± 0.19a | 26.9 ± 0.23b | 27.2 ± 0.21a | 3.91 ± 0.05c |
| Ir × Re | * | * | * | * |
| 100% ETc × Cn | 14.1 ± 0.11c | 22.4 ± 0.19d | 18.7 ± 0.15c | 5.22 ± 0.06b |
| 100% ETc× GA3 | 17.4 ± 0.15b | 45.6 ± 0.39a | 25.4 ± 0.20b | 3.77 ± 0.04e |
| 100% ETc × Db-H | 22.9 ± 0.19a | 31.2 ± 0.28c | 29.8 ± 0.20a | 3.69 ± 0.04e |
| 60% ETc × Cn | 10.3 ± 0.09d | 14.6 ± 0.20e | 12.2 ± 0.11d | 9.64 ± 0.07a |
| 60% ETc × GA3 | 14.5 ± 0.15c | 38.2 ± 0.41b | 18.5 ± 0.15c | 5.12 ± 0.06c |
| 60% ETc × Db-H | 17.9 ± 0.18b | 22.6 ± 0.18d | 24.6 ± 0.22b | 4.12 ± 0.05d |
| Season of 2019/2020 | ||||
| Irrigation (Ir) | * | * | * | ** |
| 100% of ETc | 20.4 ± 0.18a | 33.9 ± 0.29a | 24.2 ± 0.20a | 3.75 ± 0.04b |
| 60% of ETc | 15.8 ± 0.14b | 24.7 ± 0.22b | 18.2 ± 0.19b | 6.29 ± 0.07a |
| Regulators (Re) | * | ** | * | * |
| Control (Cn) | 14.1 ± 0.13c | 17.6 ± 0.20c | 15.0 ± 0.14c | 7.47 ± 0.08a |
| GA3 | 18.1 ± 0.15b | 44.4 ± 0.37a | 20.9 ± 0.19b | 4.19 ± 0.05b |
| Db-H | 22.3 ± 0.20a | 26.0 ± 0.21b | 27.7 ± 0.26a | 3.40 ± 0.04c |
| Ir × Re | * | * | * | * |
| 100% ETc × Cn | 16.8 ± 0.18c | 21.6 ± 0.22d | 17.6 ± 0.12c | 4.98 ± 0.05b |
| 100% ETc× GA3 | 19.7 ± 0.17b | 50.2 ± 0.45a | 23.8 ± 0.25b | 3.48 ± 0.03c |
| 100% ETc × Db-H | 24.8 ± 0.19a | 29.8 ± 0.21c | 31.2 ± 0.22a | 2.78 ± 0.03d |
| 60% ETc × Cn | 11.3 ± 0.08d | 13.6 ± 0.18e | 12.4 ± 0.15d | 9.96 ± 0.11a |
| 60% ETc × GA3 | 16.4 ± 0.12c | 38.5 ± 0.29b | 18.0 ± 0.13c | 4.89 ± 0.06b |
| 60% ETc × Db-H | 19.7 ± 0.21b | 22.1 ± 0.20d | 24.2 ± 0.30b | 4.01 ± 0.04c |
** and * indicate respectively differences at p ≤ 0.05 and p ≤ 0.01 probability level. Means followed by the same letter in each column are not significantly different according to the LSD test (p ≤ 0.05).