Table 1.
Amount (μg/g plant) of 2,4-D and its metabolites of one susceptible (S) and two resistant (R-703 and R-213) Papaver rhoeas populations at 12, 24, 48, 96, and 168 HAT applied at two doses (1x for 600 g/ha; 4x for 2,400 g/ha).
| Dose | Part | Product | Pop | 12 | 24 | 48 | 96 | 168 |
|---|---|---|---|---|---|---|---|---|
| 1x | Aerial part | 2,4-D | S | 8.6a* (0.1) | 9.2a (0.0) | 10.7a (0.0) | 10.7a (0.2) | 9.3 (0.1) |
| R-703 | 7.6b (0.0) | 8.2c (0.0) | 9.2b (0.0) | 5.0c (0.1) | ND | |||
| R-213 | 7.7b (0.1) | 9.0b (0.0) | 11.0a (0.2) | 7.0b (0.2) | ND | |||
| 2,3-D | S | ND | ND | ND | ND | ND | ||
| R-703 | ND | ND | 2.4 (0.0) | 5.1a (0.1) | 7.6a (0.1) | |||
| R-213 | ND | ND | ND | 2.7b (0.1) | 7.7a (0.3) | |||
| 2,5-D | S | ND | ND | ND | ND | ND | ||
| R-703 | ND | ND | ND | 1.61a (0.05) | 3.59a (0.05) | |||
| R-213 | ND | ND | ND | 0.86b (0.03) | 3.64a (0.13) | |||
| Sugar conjugate | S | ND | ND | ND | ND | ND | ||
| R-703 | ND | ND | ND | ND | ND | |||
| R-213 | ND | ND | ND | ND | ND | |||
| Root | 2,4-D | S | 0.2a (0.0) | 0.3a (0.0) | 0.7a (0.0) | 0.9a (0.0) | 2.4 (0.0) | |
| R-703 | 0.2b (0.0) | 0.1b (0.0) | 0.1c (0.0) | 0.0c (0.0) | ND | |||
| R-213 | 0.1b (0.0) | 0.1b (0.0) | 0.1b (0.0) | 0.1b (0.0) | ND | |||
| 2,3-D | S | ND | ND | ND | ND | ND | ||
| R-703 | ND | ND | ND | 0.02 (0.0) | 0.03b (0.0) | |||
| R-213 | ND | ND | ND | ND | 0.05a (0.0) | |||
| 2,5-D | S | ND | ND | ND | ND | ND | ||
| R-703 | ND | ND | ND | ND | ND | |||
| R-213 | ND | ND | ND | ND | ND | |||
| Sugar conjugate | S | ND | ND | ND | ND | ND | ||
| R-703 | ND | ND | ND | ND | ND | |||
| R-213 | ND | ND | ND | ND | ND | |||
| 4x | Aerial part | 2,4-D | S | 32.0a (0.0) | 33.2b (0.1) | 38.4a (0.1) | 38.9a (0.1) | 33.3a (0.5) |
| R-703 | 31.7a (0.1) | 33.1b (0.2) | 35.2b (0.1) | 13.3c (0.1) | 0.0b (0.0) | |||
| R-213 | 31.8a (0.2) | 35.9a (0.1) | 29.0c (0.9) | 15.5b (0.1) | 0.1b (0.0) | |||
| 2,3-D | S | ND | ND | ND | ND | ND | ||
| R-703 | ND | 1.4 (0.1) | 6.7b (0.0) | 27.4b (0.1) | 35.7a (0.1) | |||
| R-213 | ND | ND | 10.4a (0.3) | 22.8a (0.2) | 34.5b (0.2) | |||
| 2,5-D | S | ND | ND | ND | ND | ND | ||
| R-703 | ND | ND | 3.28b (0.01) | 7.29a (0.03) | 10.07a (0.03) | |||
| R-213 | ND | ND | 5.15a (0.16) | 6.06b (0.05) | 9.99a (0.07) | |||
| Sugar conjugate | S | ND | ND | ND | ND | ND | ||
| R-703 | ND | ND | ND | ND | ND | |||
| R-213 | ND | ND | ND | ND | 0.91 (0.0) | |||
| Root | 2,4-D | S | 0.7a (0.0) | 1.2a (0.0) | 2.7a (0.0) | 3.4a (0.0) | 8.9 (0.4) | |
| R-703 | 0.1c (0.0) | 0.3b (0.0) | 0.3c (0.0) | 0.0c (0.0) | ND | |||
| R-213 | 0.2b (0.0) | 0.3b (0.0) | 0.3b (0.0) | 0.2b (0.0) | ND | |||
| 2,3-D | S | ND | ND | ND | ND | ND | ||
| R-703 | ND | ND | 0.04b (0.0) | 0.1b (0.0) | 0.16b (0.01) | |||
| R-213 | ND | ND | 0.17a (0.0) | 0.3a (0.0) | 0.47a (0.03) | |||
| 2,5-D | S | ND | ND | ND | ND | ND | ||
| R-703 | ND | ND | ND | ND | ND | |||
| R-213 | ND | ND | ND | 0.09 (0.0) | 0.14 (0.01) | |||
| Sugar conjugate | S | ND | ND | ND | ND | ND | ||
| R-703 | ND | ND | ND | ND | ND | |||
| R-213 | ND | ND | ND | ND | 0.01 (0.0) |
*
Means within a column, evaluation time, plant part and product followed by the same letter are not significantly different (P > 0.05).