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Metabolic cross-resistance to florpyrauxifen-benzyl in barnyardgrass (Echinochloa crus-galli) evolved before the commercialization of Rinskor™

Published online by Cambridge University Press:  27 February 2023

Hudson K. Takano Open the ORCID record for Hudson K. Takano [Opens in a new window] ,
Scott Greenwalt ,
Dave Ouse ,
Moriah Zielinski Open the ORCID record for Moriah Zielinski [Opens in a new window]  and
Paul Schmitzer
Hudson K. Takano*
Affiliation:
Herbicide Mode of Action Scientist, Corteva Agriscience, Indianapolis, IN, USA
Scott Greenwalt
Affiliation:
Analytical Chemist, Corteva Agriscience, Indianapolis, IN, USA
Dave Ouse
Affiliation:
Herbicide Biologist, Corteva Agriscience, Indianapolis, IN, USA
Moriah Zielinski
Affiliation:
Biochemist, Corteva Agriscience, Indianapolis, IN, USA
Paul Schmitzer
Affiliation:
Global Herbicide Resistance Leader, Corteva Agriscience, Indianapolis, IN, USA
*
Author for correspondence: Hudson K. Takano, Corteva Agriscience, 9330 Zionsville Road, Indianapolis, IN 46265. (Email: hudson.takano@corteva.com)
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Abstract

Herbicide options for selective control of monocot weeds in rice (Oryza sativa L.) have historically been limited to a few modes of action such as inhibitors of acetolactate synthase (e.g., penoxsulam, imazamox), photosystem II (e.g., propanil), and acetyl-CoA carboxylase (e.g., cyhalofop). Florpyrauxifen-benzyl (Rinskor™) is a synthetic auxin molecule introduced to the U.S. rice herbicide market in 2018, providing broad-spectrum weed control (monocots and dicots), including hard-to-control species such as barnyardgrass [Echinochloa crus-galli (L.) P. Beauv.], along with postemergence rice selectivity at very low use rates. Within the year of commercialization, field agronomists and academics identified E. crus-galli escapes in some areas where florpyrauxifen-benzyl had been sprayed. Further evaluation under controlled environments confirmed that those plants were able to survive florpyrauxifen-benzyl application at the label rate. Here, we identify the mechanism of resistance to florpyrauxifen-benzyl and penoxsulam in two E. crus-galli populations from Arkansas (AR-27) and Missouri (MO-18). Using high-resolution mass spectrometry, we compared the two resistant biotypes with known susceptible plants regarding their ability to metabolize florpyrauxifen-benzyl, florpyrauxifen-acid, and penoxsulam in planta. We discovered that the resistant plants share a common resistance mechanism to florpyrauxifen-benzyl and penoxsulam, involving hydrolysis of a methoxy group (likely mediated by a cytochrome P450 monooxygenase) followed by glucose conjugation. Given that penoxsulam has been widely used in rice fields for the past decade, these data suggest that some populations of E. crus-galli may have evolved resistance before the commercialization of florpyrauxifen-benzyl.

Keywords

6-aryl-picolinatesnon–target site resistancericesynthetic auxinsweed management
Type
Research Article
Information
Weed Science , Volume 71 , Issue 2 , March 2023 , pp. 77 - 83
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Dean Riechers, University of Illinois

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