| AAPs | amino acid permeases |
| AMT | ammonium transporter |
| APX | ascorbate peroxidase |
| BABA | β-aminobutyric acid |
| CLC | chloride channel family |
| DEG | differentially expressing genes |
| GOGAT | glutamate synthase |
| GS | glutamine synthetase |
| G6PHD | glucose-6-phosphate dehydrogenase |
| LHTs | lysine/histidine transporters |
| NAC | NAM (no apical meristem), Petunia, ATAF1–2 (Arabidopsis thaliana activating factor), and CUC2 (cup-shaped cotyledon, Arabidopsis) |
| NCC | nitrogen containing compounds |
| NH4 + | ammonia |
| NiR | nitrite reductase |
| NO2 - | nitrite |
| NO3 - | nitrate |
| NR | nitrate reductase |
| NRT2 | nitrate transporter 2 |
| NUE | nitrogen use efficiency |
| NRE | nitrogen recovery efficiency |
| ProTs | proline transporters, GBTs, glycine betaine transporters |
| PTR | peptide transporter family |
| QAC | quaternary ammonium compounds |
| SLAC1 | slow anion channel homologs |
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