Repository logo

Browsing by Author "Pelon, Amber L., author"

Now showing 1 - 1 of 1
  • Thumbnail Image
    ItemOpen Access
    Factors contributing to herbicide response in CoAXium wheat
    (Colorado State University. Libraries, 2024) Pelon, Amber L., author; Dayan, Franck, advisor; Gaines, Todd, committee member; Schipanski, Meagan, committee member
    Compared to other pests, weed competition has the most significant negative impact on wheat grain yield. Understanding the contribution of metabolism in overall tolerance to herbicides can lead to new methods for controlling weeds in wheat. Glutathione S-transferase's (GSTs) role in the detoxification of herbicides has been studied since 1970. Previous literature reported increased resistance to herbicides with higher GST activity in black grass (Alopecurus myosuroides) and Asia minor bluegrass (Polypogon fugax). Resistance could be reversed by inhibiting GST activity. This research assesses the role of Phase 2 plant cell metabolism by testing (GST) inhibition to see if it influences the metabolism of quizalofop P-ethyl (QPE) in winter wheat (Triticum aestivum). We hypothesized that the addition of a safener would make the wheat more tolerant to the herbicide while the addition of a GST inhibitor would make the wheat more sensitive to QPE. Experiments were conducted analyzing the QPE effect on whole-plant biomass and an LC-MS/MS analysis of the amount of quizalofop acid (QZA) found in plant extracts. Safeners enhanced herbicide metabolism which increased CoAXium wheat tolerance to QPE. GST inhibitors, conversely, decreased herbicide metabolism causing CoAXium wheat to be more sensitive to QPE. Understanding the contribution of metabolism in overall resistance to herbicides can lead to breeding improvements for more herbicide-tolerant wheat varieties and new methods for controlling weeds in wheat.