| Irradiation dose, Gy | Root NRA, nmoles NO2 h−1×g−1 fr wt | Shoot NRA, nmoles NO2 h−1×g−1 fr wt | Chlorophyll, µg×g−1 fr wt | Carotenoid, µg×g−1 fr wt |
| 0 | 176 ± 47 (100) | 174 ± 21 (100) | 102 ± 27 (100) | 6.9 ± 2.2 (100) |
| 1 | 261 ± 57 (148) | 169 ± 56 (97) | 82 ± 6 (80) | 5.6 ± 2.0 (81) |
| 10 | 567 ± 214 (322) | 98 ± 17* (56) | 81 ± 7 (79) | 3.9 ± 1.9* (56) |
| R2 | 0.986 | 0.999 | 0.372 | 0.867 |