Resistance of Echinochloa crus-galli Populations to Acetolactate Synthase-Inhibiting Herbicides
Three Echinochloa crus-galli (barnyardgrass) populations from rice fields in Arkansas (AR1 and AR2) and Mississippi (MS1), USA, were recently confirmed to be resistant to imazethapyr. Experiments were conducted to characterize cross-resistance to acetolactate synthase- (ALS-) inhibiting herbicides a...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | International Journal of Agronomy |
| Online Access: | http://dx.doi.org/10.1155/2012/893953 |
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| author | Dilpreet S. Riar Jason K. Norsworthy Jason A. Bond Mohammad T. Bararpour Michael J. Wilson Robert C. Scott |
| author_facet | Dilpreet S. Riar Jason K. Norsworthy Jason A. Bond Mohammad T. Bararpour Michael J. Wilson Robert C. Scott |
| author_sort | Dilpreet S. Riar |
| collection | DOAJ |
| description | Three Echinochloa crus-galli (barnyardgrass) populations from rice fields in Arkansas (AR1 and AR2) and Mississippi (MS1), USA, were recently confirmed to be resistant to imazethapyr. Experiments were conducted to characterize cross-resistance to acetolactate synthase- (ALS-) inhibiting herbicides and determine if malathion, a known cytochrome P450 monooxygenase (CYP) inhibitor, would overcome resistance. The AR1 and MS1 populations were cross-resistant to bispyribac-sodium; however, AR2 was sensitive to bispyribac-sodium. The AR1, AR2, and MS1 populations were >94, >94, and 3.3 times, respectively, more resistant to imazamox; >94, 30, and 9.4 times, respectively, more resistant to penoxsulam; and 15, 0.9, and 7.2 times, respectively, more resistant to bispyribac-sodium compared to a susceptible population. Addition of malathion to penoxsulam reduced dry weight of all populations and increased mortality of AR2 and MS1 populations compared to penoxsulam alone. Addition of malathion to imazethapyr and bispyribac-sodium increased the mortality of MS1 population in mixture with imazethapyr and AR1 population in mixture with bispyribac-sodium compared to treatments with imazethapyr and bispyribac-sodium applied alone. Synergism of ALS-inhibiting herbicides with malathion indicates increased herbicide degradation by CYP as partial mechanism of resistance to penoxsulam in all resistant populations and probably to imazethapyr in MS1 and bispyribac-sodium in AR1 populations. |
| format | Article |
| id | doaj-art-f8c5f6dcf9e44ea79078fa6c7d63f4b4 |
| institution | Kabale University |
| issn | 1687-8159 1687-8167 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Agronomy |
| spelling | doaj-art-f8c5f6dcf9e44ea79078fa6c7d63f4b42025-02-03T05:52:53ZengWileyInternational Journal of Agronomy1687-81591687-81672012-01-01201210.1155/2012/893953893953Resistance of Echinochloa crus-galli Populations to Acetolactate Synthase-Inhibiting HerbicidesDilpreet S. Riar0Jason K. Norsworthy1Jason A. Bond2Mohammad T. Bararpour3Michael J. Wilson4Robert C. Scott5Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704, USADepartment of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704, USADelta Research and Extension Center, Mississippi State University, Stoneville, MS 38776, USADepartment of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704, USADepartment of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704, USADepartment of Crop, Soil, and Environmental Sciences-Cooperative Extension Service, University of Arkansas, Lonoke, AR 72086, USAThree Echinochloa crus-galli (barnyardgrass) populations from rice fields in Arkansas (AR1 and AR2) and Mississippi (MS1), USA, were recently confirmed to be resistant to imazethapyr. Experiments were conducted to characterize cross-resistance to acetolactate synthase- (ALS-) inhibiting herbicides and determine if malathion, a known cytochrome P450 monooxygenase (CYP) inhibitor, would overcome resistance. The AR1 and MS1 populations were cross-resistant to bispyribac-sodium; however, AR2 was sensitive to bispyribac-sodium. The AR1, AR2, and MS1 populations were >94, >94, and 3.3 times, respectively, more resistant to imazamox; >94, 30, and 9.4 times, respectively, more resistant to penoxsulam; and 15, 0.9, and 7.2 times, respectively, more resistant to bispyribac-sodium compared to a susceptible population. Addition of malathion to penoxsulam reduced dry weight of all populations and increased mortality of AR2 and MS1 populations compared to penoxsulam alone. Addition of malathion to imazethapyr and bispyribac-sodium increased the mortality of MS1 population in mixture with imazethapyr and AR1 population in mixture with bispyribac-sodium compared to treatments with imazethapyr and bispyribac-sodium applied alone. Synergism of ALS-inhibiting herbicides with malathion indicates increased herbicide degradation by CYP as partial mechanism of resistance to penoxsulam in all resistant populations and probably to imazethapyr in MS1 and bispyribac-sodium in AR1 populations.http://dx.doi.org/10.1155/2012/893953 |
| spellingShingle | Dilpreet S. Riar Jason K. Norsworthy Jason A. Bond Mohammad T. Bararpour Michael J. Wilson Robert C. Scott Resistance of Echinochloa crus-galli Populations to Acetolactate Synthase-Inhibiting Herbicides International Journal of Agronomy |
| title | Resistance of Echinochloa crus-galli Populations to Acetolactate Synthase-Inhibiting Herbicides |
| title_full | Resistance of Echinochloa crus-galli Populations to Acetolactate Synthase-Inhibiting Herbicides |
| title_fullStr | Resistance of Echinochloa crus-galli Populations to Acetolactate Synthase-Inhibiting Herbicides |
| title_full_unstemmed | Resistance of Echinochloa crus-galli Populations to Acetolactate Synthase-Inhibiting Herbicides |
| title_short | Resistance of Echinochloa crus-galli Populations to Acetolactate Synthase-Inhibiting Herbicides |
| title_sort | resistance of echinochloa crus galli populations to acetolactate synthase inhibiting herbicides |
| url | http://dx.doi.org/10.1155/2012/893953 |
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