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...

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Autores: Vijaya Bhaskar, Alwarnaidu Vijayarajan, Vijayakumar, Iniya, Torra Farré, Joel, Runge, Fabian, Hennessy, Michael, Dermot Forristal, Patrick
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
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spelling Insights into ALS-inhibiting herbicide resistance in Poa annua in an arable cropping systemVijaya Bhaskar, Alwarnaidu VijayarajanVijayakumar, IniyaTorra Farré, JoelRunge, FabianHennessy, MichaelDermot Forristal, PatrickAcetolactate synthase inhibitorsAnnual bluegrassTarget-site mutationsWinter wheatBACKGROUND: 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.Wiley2025info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttps://doi.org/10.1002/ps.70121https://hdl.handle.net/10459.1/468875reponame:Repositori Obert UdL instname:Universitat de Lleida (UdL)InglésReproducció del document publicat a https://doi.org/10.1002/ps.70121Pest Management Science, 2025, vol. 81, núm. 12, p. 8128-8136cc-by (c) Vijaya et al., 2025Attribution 4.0 Internationalinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/oai:repositori.udl.cat:10459.1/4688752026-06-24T12:42:17Z
dc.title.none.fl_str_mv Insights into ALS-inhibiting herbicide resistance in Poa annua in an arable cropping system
title Insights into ALS-inhibiting herbicide resistance in Poa annua in an arable cropping system
spellingShingle Insights into ALS-inhibiting herbicide resistance in Poa annua in an arable cropping system
Vijaya Bhaskar, Alwarnaidu Vijayarajan
Acetolactate synthase inhibitors
Annual bluegrass
Target-site mutations
Winter wheat
title_short Insights into ALS-inhibiting herbicide resistance in Poa annua in an arable cropping system
title_full Insights into ALS-inhibiting herbicide resistance in Poa annua in an arable cropping system
title_fullStr Insights into ALS-inhibiting herbicide resistance in Poa annua in an arable cropping system
title_full_unstemmed Insights into ALS-inhibiting herbicide resistance in Poa annua in an arable cropping system
title_sort Insights into ALS-inhibiting herbicide resistance in Poa annua in an arable cropping system
dc.creator.none.fl_str_mv Vijaya Bhaskar, Alwarnaidu Vijayarajan
Vijayakumar, Iniya
Torra Farré, Joel
Runge, Fabian
Hennessy, Michael
Dermot Forristal, Patrick
author Vijaya Bhaskar, Alwarnaidu Vijayarajan
author_facet Vijaya Bhaskar, Alwarnaidu Vijayarajan
Vijayakumar, Iniya
Torra Farré, Joel
Runge, Fabian
Hennessy, Michael
Dermot Forristal, Patrick
author_role author
author2 Vijayakumar, Iniya
Torra Farré, Joel
Runge, Fabian
Hennessy, Michael
Dermot Forristal, Patrick
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Acetolactate synthase inhibitors
Annual bluegrass
Target-site mutations
Winter wheat
topic Acetolactate synthase inhibitors
Annual bluegrass
Target-site mutations
Winter wheat
description 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.
publishDate 2025
dc.date.none.fl_str_mv 2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.1002/ps.70121
https://hdl.handle.net/10459.1/468875
url https://doi.org/10.1002/ps.70121
https://hdl.handle.net/10459.1/468875
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a https://doi.org/10.1002/ps.70121
Pest Management Science, 2025, vol. 81, núm. 12, p. 8128-8136
dc.rights.none.fl_str_mv cc-by (c) Vijaya et al., 2025
Attribution 4.0 International
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
rights_invalid_str_mv cc-by (c) Vijaya et al., 2025
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
dc.source.none.fl_str_mv reponame:Repositori Obert UdL
instname:Universitat de Lleida (UdL)
instname_str Universitat de Lleida (UdL)
reponame_str Repositori Obert UdL
collection Repositori Obert UdL
repository.name.fl_str_mv
repository.mail.fl_str_mv
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