Table II.
Compared growth inhibition by phenylureas of wild-type and transgenic tobacco and Arabidopsis
| Herbicide Treatment | Tobacco
|
|||
|---|---|---|---|---|
| Wild type | CYP76B1 | 76B1-HTR1 | 76B1-HTR1Δ | |
| I50 (μm) | ||||
| CTU | 14 | 180 (12.9) | 36 (2.6) | 55 (3.9) |
| IPU | 28 | 90 (3.2) | 49 (1.8) | 64 (2.3) |
| LIN | 10 | 220 (22) | 50 (5) | 108 (10.8) |
| Arabidopsis | ||||
| Wild type | CYP76B1 | 76B1-HTR1 | 76B1-HTR1Δ | |
| IPU | 7 | 44 (6.3) | – | 23 (3.3) |
| LIN | 7 | 80 (11.4) | – | 21 (3) |
I50 for chlortoluron (CTU), isoproturon (IPU), and linuron (LIN) were determined from the dose-response curves based on three independent measurements of shoot fresh weight 9 d after herbicide treatment. Resistance factors (I50R/I50S) are shown in brackets. R, Resistant to phenylurea herbicides; S, susceptible to phenylurea herbicides.