| Groups | UV-B radiation dose | light culture | Enhanced UV-B radiation | Dark culture |
| CK |
| 8 h/d |
| 16 h/d |
| B1 | 4.05 kJ・m−2・d−1 | 8 h/d | 8 h/d | 16 h/d |
| B2 | 10.08 kJ・m−2・d−1 | 8 h/d | 8 h/d | 16 h/d |
| B3 | 17.05 kJ・m−2・d−1 | 8 h/d | 8 h/d | 16 h/d |
| B4 | 23.02 kJ・m−2・d−1 | 8 h/d | 8 h/d | 16 h/d |