| Treatment | Fv/Fm | |
| Average | SD | |
| untreated | 0.73 | 0.01 |
| 0.025 µM | 0.74 | 0.01 |
| 0.05 µM | 0.74 | 0.01 |
| 0.1 µM | 0.73 | 0.01 |
| 0.5 µM | 0.65 | 0.02 |
| 1 µM | 0.61 | 0.01 |
| 2.5 µM | 0.55 | 0.02 |
| 5 µM | 0.53 | 0.00 |
| 10 µM | 0.53 | 0.01 |
| 20 µM | 0.52 | 0.01 |
| 40 µM | 0.51 | 0.01 |