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AHAS I50 values of the resistant and susceptible L. rigidum populations for the SU herbicide sulfometuron
| Population | I50 (μM) | R/S (I50) ratio |
| S (average) | 0.0075 d | |
| R-197-Ala | 0.71 c | 95 |
| R-197-Arg | 1.81 a | 241 |
| R-197-Gln | 1.48 b | 197 |
| R-197-Ser | 1.57 b | 209 |
| R-574-Leu | >10 | >1333 |
I50 values from the three S populations were averaged. Means (n=2 or 3) with different letters are significantly different, P=0.05)
