Bibliographic Details
| Title: |
Target‐site resistance to ALS‐inhibiting herbicides in Stellaria media, Papaver rhoeas, Glebionis segetum and Veronica persica from Ireland. |
| Authors: |
Alwarnaidu Vijayarajan, Vijaya Bhaskar, Torra, Joel, Runge, Fabian, Nolan, Gerard, Hennessy, Michael, Dermot Forristal, Patrick |
| Source: |
Weed Research; Jan/Feb2025, Vol. 65 Issue 1, p1-11, 11p |
| Subject Terms: |
ACETOLACTATE synthase, HERBICIDE resistance, PAPAVERACEAE, CHEMICAL resistance |
| Geographic Terms: |
IRELAND |
| Abstract: |
The increasing reliance on acetolactate synthase (ALS)‐inhibiting herbicides alone has resulted in the evolution of resistance in key broad‐leaf species in cereal farms in Ireland. Our objective was to confirm and characterise the resistance levels and mechanisms in resistance‐suspect populations (R) of Stellaria media (STEME‐R1, STEME‐R2 and STEME‐R3), Papaver rhoeas (PAPRH‐R), Glebionis segetum (GLESE‐R) and Veronica persica (VERPE‐R) to two different ALS‐inhibiting herbicide chemistries, sulfonylurea (SU) and triazolopyrimidine (TP). Following single‐dose testing that confirmed inadequate control of all six R populations, dose–response experiments revealed varying resistance levels to SU and/or TP, which were associated with target‐site resistance mutations. Weed species populations, STEME‐R1 and STEME‐R3 (both Trp‐574‐Leu), and STEME‐R2 (combined Trp‐574‐Leu and Pro‐197‐Ser; first report for this species), and PAPRH‐R (Trp‐574‐Leu, which was detected for the first time in all population plants, combined with Pro‐197‐His or Pro‐197‐Leu) and VERPE‐R (Trp‐574‐Leu; first worldwide case) showed high resistance or cross‐resistance to SU and TP. All herbicide‐surviving plants tested were heterozygous for single or combined mutations. The G. segetum population, GLESE‐R, had multiple substitutions and zygosity (Pro/Leu, Leu, Leu/Gln or Thr/Leu) at Pro‐197, which was identified for the first time for this species conferred SU resistance only. Cytochrome P450 inhibitor studies on selected species did not detect metabolism‐mediated resistance to SU or TP. Alternative herbicide modes of action alone or in co‐formulation with ALS‐TP should be used to manage these resistant populations. This study has added new information to the current knowledge of the resistance spectrum to ALS inhibitors in several broad‐leaved weeds. [ABSTRACT FROM AUTHOR] |
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| Database: |
Complementary Index |
