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Metabolic Resistance to S ‐Metolachlor in Two Waterhemp ( Amaranthus tuberculatus ) Populations from Illinois, United States by Strom, Seth A.; Hager, Aaron G.; Seiter, Nicholas J.; Davis, Adam S.; Riechers, Dean E. is a Agricultural and Biological Sciences article available to read on EtoBox.
What is Metabolic Resistance to S ‐Metolachlor in Two Waterhemp ( Amaranthus tuberculatus ) Populations from Illinois, United States about?
## Abstract ## BACKGROUND Two waterhemp (Amaranthus tuberculatus) populations from Illinois demonstrating multiple‐resistance to acetolactate synthase (ALS)‐, 4‐hydroxyphenylpyruvate dioxygenase, and photosystem II (PSII)‐inhibiting herbicides (designated CHR and SIR) also displayed reduced sensitivity to very‐long‐chain fatty acid‐inhibiting herbicides, including S‐metolachlor. We hypothesized that a physiological mechanism, such as enhanced metabolism, could be responsible for the reduced efficacy of S‐metolachlor. ## RESULTS Metabolism experiments indicated that resistant populations degraded S‐metolachlor more rapidly than sensitive populations and equally as rapidly as corn 2–24 h after treatment (HAT). Resistant waterhemp and corn metabolized 90% (DT~90~) of absorbed S‐metolachlor in less than 3.2 h whereas DT~90~ values for sensitive waterhemp exceeded 6 h. The glutathione S‐transferase inhibitor 4‐chloro‐7‐nitrobenzofurazon and cytochrome P450‐inhibitor malathion decreased the amount of S‐metolachlor metabolized in resistant waterhemp at 4 HAT but not in sensitive waterhemp or corn, and altered the abundance of certain metabolites in resistant waterhemp. ## CONCLUSION Resul
Who reads Metabolic Resistance to S ‐Metolachlor in Two Waterhemp ( Amaranthus tuberculatus ) Populations from Illinois, United States?
It is typically read by researchers, students, and practitioners in Agricultural and Biological Sciences.
- Author
- Strom, Seth A.; Hager, Aaron G.; Seiter, Nicholas J.; Davis, Adam S.; Riechers, Dean E.
- Publisher
- John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 1526-498X)
- Published
- 2020
- Language
- EN
- Field
- Agricultural and Biological Sciences (Life Sciences)