Insights into ALS-inhibiting herbicide resistance in Poa annua in an arable cropping system
BACKGROUND: Dependence on a single herbicide type to control a broad-spectrum of weeds has resulted in cases of resistance toacetolactate synthase (ALS) inhibitors in weeds normally considered lower priority such as Poa annua, being recorded in winterwheat fields in Ireland. This study characterizes...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat de Lleida (UdL) |
| Repositorio: | Repositori Obert UdL |
| OAI Identifier: | oai:repositori.udl.cat:10459.1/468875 |
| Acceso en línea: | https://doi.org/10.1002/ps.70121 https://hdl.handle.net/10459.1/468875 |
| Access Level: | acceso abierto |
| Palabra clave: | Acetolactate synthase inhibitors Annual bluegrass Target-site mutations Winter wheat |
| Sumario: | BACKGROUND: Dependence on a single herbicide type to control a broad-spectrum of weeds has resulted in cases of resistance toacetolactate synthase (ALS) inhibitors in weeds normally considered lower priority such as Poa annua, being recorded in winterwheat fields in Ireland. This study characterizes resistance to ALS-inhibiting sulfonylureas (SU), sulfonylamino-carbonyl-triazolinones(SCT) and triazolopyrimidine (TP) herbicides in five resistance-suspect populations (POAAN-R1 to POAAN-R5).RESULTS: Variability in cross-resistance levels were noted in the POAAN-R populations, correlating with target-site mutations andspecific amino acid substitutions. Mutations Pro-197-Thr in POAAN-R1, Pro-197-Thr + Trp-574-Leu in POAAN-R4, and Trp-574-Leuin POAAN-R5 confer high levels of resistance to SU, SU + SCT and TP herbicides (GR50 resistance index, RI >10). In POAAN-R2, Pro-197-Gln confers high resistance to SU and SU + SCT (RI >10) and low resistance to TP (RI = 3.2). POAAN-R3 with Pro-197-Thr+ Pro-197-Gln, confers moderate resistance to SU and SU + SCT (RI >5) and high resistance to TP (RI >10). All sequenced plantshad homozygous mutations that evolved independently in ALS1 (Pro-197-Gln) or ALS2 (Pro-197-Thr or Trp-574-Leu) isoforms. Amongthe alternative non-residual herbicides evaluated, clethodim and glyphosate effectively controlled P. annua populations.CONCLUSION: Pro-197-Thr and/or Pro-197-Gln, as well as the combination of Pro-197-Thr + Trp-574-Leu were identified for thefirst time in P. annua in this study. As cultural/non-chemical management of P. annua is challenging, the primary control incereal crops will likely be the use of non-ALS herbicide modes of action, including the application of pre-emergence or autumnresidual-type herbicides. |
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