Full TGIF Record # 325019
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Web URL(s):https://scisoc.confex.com/scisoc/2022am/meetingapp.cgi/Paper/144659
    Last checked: 01/31/2023
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Rutland, Claudia Ann; Bagavathiannan, Muthu; Grubbs, Becky; Hathcoat, Daniel; McElroy, J. Scott
Author Affiliation:Rutland: Presenting Author and Auburn University; Bagavathiannan and Grubbs: Texas A&M University; Hathcoat: Department of Soil and Crop Sciences, Texas A&M University; McElroy: Auburn University
Title:Foliar vs root uptake of photosystem ll herbicides in Poa annua populations
Section:Turfgrass pest management poster: Diseases, insects, weeds I (includes student competition)
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C05 turfgrass science
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Meeting Info.:Baltimore, Maryland: November 6-9, 2022
Source:ASA, CSSA, SSSA International Annual Meeting. 2022, p. 144659.
Publishing Information:[Madison, Wisconsin]: [American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America]
# of Pages:1
Abstract/Contents:"Poa annua is an allotetraploid weed species that presents as a significant issue in turfgrass, due to the increasing amount of reported resistance. In one mode of action, HRAC 5, or the inhibition of photosynthesis at photosystem II, resistance can manifest as a single nucleotide polymorphism (SNP) at the Ser264 loci in the psbA gene. This SNP is known to endow cross resistance to the triazine, triazinone, and urea herbicide families. As a single-copy, chloroplast-encoded gene, psbA is generally easy to sequence compared to other nuclear-encoded genes in polyploid species. Knowing these facts, an interesting double-peak presented at the Ser264 loci that has the potential of conferring resistance as the Ser264Gly mutation in two different resistant populations: AL-4-SP-43 and TX-4-GC-1. The uniqueness of a double-peak appearing in a single-copy gene begs the question if it affects the resistance status of these populations. AL-4-SP-43 was previously tested for (and noted as) resistant to simazine, atrazine, and metribuzin, while TX-4-GC-1 was found resistant to simazine. In order to determine if this double-peak is affecting the level of resistance, a selective placement greenhouse trial was conducted using simazine, atrazine, metribuzin, and diuron with the two resistant populations and a susceptible population, AL-3-GC-9. Each population was treated with each herbicide as either a soil-only, foliar-only, or standard soil+foliar application, along with a non-treated sample. Percent injury was measured at 7, 14, and 21 DAT and relative biomass was measured at 21 DAT. Results were analyzed in RStudio using a two-way ANOVA and post-hoc Fishers LSD. ANOVA results revealed a significant difference between injury and population and injury and treatment. Interestingly, the two resistant populations displayed conflicting results, however the overall results are unlikely to elucidate whether the double-peak has an effect on resistance. More sequencing is likely necessary to make a final determination."
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Rutland, C. A., M. Bagavathiannan, B. Grubbs, D. Hathcoat, and J. S. McElroy. 2022. Foliar vs root uptake of photosystem ll herbicides in Poa annua populations. Agron. Abr. p. 144659.
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