| Irradiation dose, Gy | Root wt, g | Leaf wt, g | Leaf NRA, nmoles NO2 h−1 g−1 fr wt |
| 0.0 | 0.211 ± 0.02 (100) | 0.155 ± 0.02 (100) | 189 ± 53 (100) |
| 0.5 | 0.123 ± 0.03* (58) | 0.147 ± 0.04 (110) | 123 ± 57 (65) |
| 2.0 | 0.06 ± 0.01*** (28) | 0.07 ± 0.01** (45) | 127 ± 65 (67) |
| 5.0 | 0.05 ± 0.01*** (24) | 0.08 ± 0.01** (52) | 55 ± 21* (29) |
| R2 | 0.615 | 0.711 | 0.825 |