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Mechanism of resistance to penoxsulam in late watergrass [Echinochloa phyllopogon (stapf) koss.]
Year:
2009
Authors :
Yasuor, Hagai
;
.
Volume :
57
Co-Authors:
Yasuor, H., Weed Science Program, Department of Plant Sciences, University of California, Davis, CA 95616, United States
Osuna, M.D., Departamento de Hortofruticultura, Centro de Investigación Finca La Orden, 06781 Guadajira, Badajoz, Spain
Ortiz, A., Universidad Central de Venezuela, Estado de Aragua, Maracay, Venezuela
Saldain, N.E., Instituto Nacional de Investigacíon Agropecuaria, Treinta y Tres, Uruguay
Eckert, J.W., Weed Science Program, Department of Plant Sciences, University of California, Davis, CA 95616, United States
Fischer, A.J., Weed Science Program, Department of Plant Sciences, University of California, Davis, CA 95616, United States
Facilitators :
From page:
3653
To page:
3660
(
Total pages:
8
)
Abstract:
Late watergrass [Echinochloa phyllopogon (Stapf.) Koss.] is a major weed of California rice that has evolved P450-mediated metabolic resistance to multiple herbicides. Resistant (R) populations are also poorly controlled by the recently introduced herbicide penoxsulam. Ratios (R/S) of the R to susceptible (S) GR50 (herbicide rate for 50% growth reduction) ranged from 5 to 9. Although specific acetolactate synthase (ALS) activity was 1.7 higher in R than in S plants, the enzyme in R plants was about 6 times more susceptible to the herbicide. R plants exhibited faster (2.8 times) oxidative [ 14C]- penoxsulam metabolism than S plants 24 h after treatment. Addition of malathion (P450 inhibitor) enhanced herbicide phytotoxicity and reduced penoxsulam metabolism in R plants. Tank mixtures with thiobencarb (can induce P450) antagonized penoxsulam toxicity in R plants, suggesting penoxsulam may be broken down by a thiobencarb-inducible enzyme. These results suggest E. phyllopogon resistance to penoxsulam is mostly due to enhanced herbicide metabolism, possibly via P450 monooxidation. © 2009 American Chemical Society.
Note:
Related Files :
Cytochrome P450 monooxygenases
Growth, Development and Aging
herbicides
metabolism
Oryza sativa
Show More
Related Content
More details
DOI :
10.1021/jf8039999
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
21554
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:45
Scientific Publication
Mechanism of resistance to penoxsulam in late watergrass [Echinochloa phyllopogon (stapf) koss.]
57
Yasuor, H., Weed Science Program, Department of Plant Sciences, University of California, Davis, CA 95616, United States
Osuna, M.D., Departamento de Hortofruticultura, Centro de Investigación Finca La Orden, 06781 Guadajira, Badajoz, Spain
Ortiz, A., Universidad Central de Venezuela, Estado de Aragua, Maracay, Venezuela
Saldain, N.E., Instituto Nacional de Investigacíon Agropecuaria, Treinta y Tres, Uruguay
Eckert, J.W., Weed Science Program, Department of Plant Sciences, University of California, Davis, CA 95616, United States
Fischer, A.J., Weed Science Program, Department of Plant Sciences, University of California, Davis, CA 95616, United States
Mechanism of resistance to penoxsulam in late watergrass [Echinochloa phyllopogon (stapf) koss.]
Late watergrass [Echinochloa phyllopogon (Stapf.) Koss.] is a major weed of California rice that has evolved P450-mediated metabolic resistance to multiple herbicides. Resistant (R) populations are also poorly controlled by the recently introduced herbicide penoxsulam. Ratios (R/S) of the R to susceptible (S) GR50 (herbicide rate for 50% growth reduction) ranged from 5 to 9. Although specific acetolactate synthase (ALS) activity was 1.7 higher in R than in S plants, the enzyme in R plants was about 6 times more susceptible to the herbicide. R plants exhibited faster (2.8 times) oxidative [ 14C]- penoxsulam metabolism than S plants 24 h after treatment. Addition of malathion (P450 inhibitor) enhanced herbicide phytotoxicity and reduced penoxsulam metabolism in R plants. Tank mixtures with thiobencarb (can induce P450) antagonized penoxsulam toxicity in R plants, suggesting penoxsulam may be broken down by a thiobencarb-inducible enzyme. These results suggest E. phyllopogon resistance to penoxsulam is mostly due to enhanced herbicide metabolism, possibly via P450 monooxidation. © 2009 American Chemical Society.
Scientific Publication
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