| FC | Field capacity |
| N | Nitrogen |
| GS | Glutamine synthetase |
| NR | Nitrate reducates |
| CK | Well-watered control; |
| DS | Drought stress |
| MT | Melatonin |
| M + N | Melatonin plus Nitrogen |
| DW | Dry weight |
| ROS | Reactive oxygen species |
| SOD | Superoxide dismutase |
| POD | Peroxidase |
| CAT | Catalase |
| APX | Ascorbate peroxidase |
| AsA-GSH | Ascorbate glutathione |
| GSH | Glutathione |
| ASA | Ascorbate |
| O2 | Superoxide |
| H2O2 | Hydrogen peroxide |
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