Claim · model-written summary
The GB-R and SO-R P. dichotomiflorum populations were 29- and 37-fold more resistant to nicosulfuron than the susceptible TS-S population.
Panicum dichotomiflorumVerbatim
t0“nicosulfuron-resistant fall panicum ( Panicum dichotomiflorum ) populations from Spain”
e1“Dose–response assays confirmed that GB-R and SO-R populations were 29- and 37-fold more resistant than the TS-S population”
Title
German Mora; Alfredo Manicardi; Maria Dolores Osuna; et al. Weed Science 2025. doi:10.1017/wsc.2025.10072
Other claims from this paper (10)
- Intervention effect Co-application of nicosulfuron with the P450 inhibitor PBO significantly reduced resistance in both populations.
- Intervention effect Co-application of nicosulfuron with the GST inhibitor NBD-Cl significantly reduced resistance in both populations.
- Intervention effect In GB-R, PBO lowered the GR50 of nicosulfuron from 66.3 to 15.8 g ai per ha, a 76% resistance reduction.
- Intervention effect In GB-R, NBD-Cl lowered the GR50 of nicosulfuron from 66.3 to 6.5 g ai per ha, a 90% resistance reduction.
- Intervention effect In SO-R, PBO lowered the GR50 of nicosulfuron from 83.8 to 16.8 g ai per ha, an 80% resistance reduction.
- Intervention effect In SO-R, NBD-Cl lowered the GR50 of nicosulfuron from 83.8 to 15.7 g ai per ha, an 81% resistance reduction.
- Observation Sequencing of the ALS gene revealed no known target-site mutations in the populations.
- Association ALS enzyme activity did not significantly differ between resistant and susceptible populations.
- Mechanism Nicosulfuron resistance in two Spanish P. dichotomiflorum populations is potentially associated with enhanced metabolism via P450 and GST enzymes.
- Observation The study provides the first worldwide evidence of non-target-site resistance (NTSR) in this species.