| LR | lateral root |
| NAA | 1-naphthyl acetic acid |
| NPA | N-1-naphthylphthalamic acid |
| EPR | electron paramagnetic resonance |
| cPTIO | 2-4-carboxyphenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide |
| NR | nitrate reductase |
| NO | nitric oxide |
| NOS | nitric oxide synthetase |
| H2 | hydrogen gas |
| GC | gas chromatography |
| LSCM | laser scanning confocal microscopy |
| NAME | NG-nitro-l-arginine methyl ester hydrochloride |
| GSNOR | S-nitrosoglutathione reductase |
| Tg | tungstate |
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