Honors College Thesis
 

Strain-specific effects of the herbicide RoundUp on diverse natural isolates of Saccharomyces cerevisiae

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https://ir.library.oregonstate.edu/concern/honors_college_theses/vx021n798

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  • The safety of the chemical glyphosate, the active ingredient in the herbicide RoundUpTM, has been questioned on numerous occasions. Previous studies suggest that glyphosate-containing herbicides have deleterious effects on a variety of organisms; other studies suggest that these effects may be minor, transient, or non-existent altogether. Proper maintenance of microbial soil communities is imperative to agricultural success; yeasts can play an important role in these communities. Studies involving the brewer's yeast Saccharomyces cerevisiae have the ability to model eukaryotes, microbes, genetics, systems-level genomics, as well as to inspect yeasts themselves. Therefore, studying the effects of RoundUpTM on S. cerevisiae may provide direct insight into the potential effects of RoundUpTM on soil yeast health, and indirect insight into the effects of RoundUpTM on non-target organisms including other soil microbes and eukaryotes. Here, we characterize the effects of RoundUpTM on 12 genetically diverse isolates of S. cerevisiae. Growth assays in media with and without RoundUpTM indicate that the herbicide inhibits growth in all strains, but the magnitude of this inhibition is variable among strains. Our results suggest that the genetic basis for RoundUpTM resistance is strain-specific in S. cerevisiae, inviting further study into genetic variants that may be useful in applied contexts. Key Words: RoundUpTM, glyphosate, Saccharomyces cerevisiae
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