Table 2.
Parameters of the sigmoidal equation used to estimate the concentration (µM) of ALS-inhibiting herbicides needed to inhibit the ALS activity by 50% (I50) in imazamox-susceptible and imazamox-resistant soft (Triticum aestivum) and durum (Triticum durum) wheat varieties.
| Herbicide | Cultivar | c | d | b | R2 aj | P-value | I50 (CI95) | RFb |
|---|---|---|---|---|---|---|---|---|
| Imidazolinones | ||||||||
| Imazamox | Rafalín | 100.0 | 4.2 | 2.1 | 1.00 | <0.0001 | 314.1 (23.7) | 82.7 |
| Gazul | 98.3 | 2.0 | 2.9 | 0.99 | <0.0001 | 3.8 (0.93) | — | |
| Antoñín | 99.7 | 4.9 | 2.9 | 0.99 | <0.0001 | 62.3 (8.2) | 13.8 | |
| Simeto | 98.3 | 3.4 | 2.6 | 0.99 | <0.0001 | 4.5 (0.87) | — | |
| Imazapyr | Rafalín | 100.0 | 5.4 | 3.4 | 0.99 | <0.0001 | 176.6 (14.5) | 25.6 |
| Gazul | 100.0 | 3.2 | 3.2 | 0.99 | <0.0001 | 6.9 (0.64) | — | |
| Antoñín | 100.0 | 4.9 | 3.1 | 0.99 | <0.0001 | 80.7 (6.2) | 10.6 | |
| Simeto | 100.0 | 3.6 | 3.7 | 0.99 | <0.0001 | 7.6 (0.81) | — | |
| Imazaquin | Rafalín | 100.0 | 5.9 | 4.6 | 1.00 | <0.0001 | 88.6 (5.7) | 36.9 |
| Gazul | 99.9 | 2.3 | 2.1 | 0.99 | 0.0002 | 2.4 (0.23) | — | |
| Antoñín | 99.0 | 5.9 | 5.2 | 0.99 | <0.0001 | 59.9 (4.3) | 28.5 | |
| Simeto | 100.2 | 1.5 | 1.6 | 0.99 | <0.0001 | 2.1 (0.16) | — | |
| Other ALS-inhibiting families | ||||||||
| Tribenuron methyl (SU) | Rafalín | 99.4 | 0.9 | 1.5 | 0.98 | <0.0001 | 2.4 (0.11) | 0.8 |
| Gazul | 100.0 | 1.8 | 1.1 | 0.96 | 0.0066 | 2.9 (0.22) | — | |
| Antoñín | 99.7 | 0.8 | 1.3 | 0.99 | <0.0001 | 2.7 (0.31) | 0.9 | |
| Simeto | 100.0 | 1.1 | 1.1 | 0.98 | <0.0001 | 2.8 (0.14) | — | |
| Florasulam (TP) | Rafalín | 100.1 | 2.0 | 1.1 | 0.96 | <0.0001 | 1.3 (0.23) | 1.4 |
| Gazul | 96.5 | 1.7 | 1.6 | 0.99 | <0.0001 | 0.9 (0.14) | — | |
| Antoñín | 100.0 | 2.1 | 1.3 | 0.98 | 0.0005 | 1.2 (0.17) | 1.5 | |
| Simeto | 99.7 | 2.3 | 1.1 | 0.99 | <0.0001 | 0.8 (0.11) | — | |
| Bispyribac sodium (PTB) | Rafalín | 96.0 | 2.5 | 4.5 | 0.99 | <0.0001 | 4.7 (0.86) | 1.1 |
| Gazul | 93.6 | 1.9 | 3.3 | 0.98 | 0.0011 | 4.4 (0.41) | — | |
| Antoñín | 94.0 | 2.4 | 4.4 | 0.98 | 0.0176 | 4.7 (0.62) | 1.4 | |
| Simeto | 96.4 | 1.4 | 1.9 | 0.98 | 0.0072 | 3.3 (0.75) | — | |
| Flucarbazone (SCT) | Rafalín | 97.6 | 1.8 | 1.6 | 0.99 | 0.0004 | 2.3 (0.20) | 0.8 |
| Gazul | 98.1 | 1.1 | 1.9 | 0.98 | 0.0028 | 3.0 (0.45) | — | |
| Antoñín | 96.7 | 1.3 | 1.7 | 0.99 | 0.0010 | 2.8 (0.32) | 0.9 | |
| Simeto | 98.6 | 1.6 | 1.7 | 0.99 | 0.0004 | 2.9 (0.27) | — | |
c = lower limit, d = upper limit, b = Hill’s slope, R2 aj = 1 − (sums of squares of the regression/corrected total sums of squares). RF = Resistance factor = I50R/I50S. cCI values are the 95% confidence intervals (n = 3). SU = Sulfonylureas. PTB = Pyrimidinylthiobenzoates. SCT = Sulfonylaminocarbonyltriazolinone. TP = Triazolopyrimidines.