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- W3048391188 abstract "Extensive acceptance of glyphosate-resistant (GR)row crops coupled with the simultaneous increase in glyphosate usage has spedthe evolution of glyphosate resistance in economically important weeds. GR Amaranthus palmeri populations arewidespread across the state with some exhibiting multiple resistance toacetolactate synthase (ALS) inhibiting herbicides such as pyrithiobac. A GR andALS inhibitor-resistant accession was also resistant to the protoporphyrinogenoxidase (PPO) inhibiting herbicide fomesafen. The PPO inhibitor resistanceprofile and multiple herbicide resistance mechanisms in this accession were investigated. In addition to fomesafen, resistanceto postemergence applications of acifluorfen, lactofen, carfentrazone,and sulfentrazone was confirmed. There was no resistance to preemergenceapplication of fomesafen, flumioxazin, or oxyfluorfen. Molecular analysis ofthe ALS gene indicated thepresence of point mutations leading to single nucleotide substitutions atcodons 197, 377, 574, and 653, resulting in proline-to-serine,arginine-to-glutamine, tryptophan-to-leucine, and serine-to-asparaginereplacements, respectively. The resistant accession contained up to 87-foldmore copies of the EPSPS genecompared to a susceptible accession. A mutation leading to a deletion of glycineat codon 210 (ΔG210) of PPO2 gene was also detected. These results indicate that the mechanism of resistancein the Palmer amaranth accession is target-site based, i.e., altered target sitefor ALS and PPO inhibitor resistance and gene amplification for glyphosateresistance." @default.
- W3048391188 created "2020-08-18" @default.
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- W3048391188 date "2020-01-01" @default.
- W3048391188 modified "2023-10-10" @default.
- W3048391188 title "Target Site-Based Resistance to ALS Inhibitors, Glyphosate, and PPO Inhibitors in an <i>Amaranthus palmeri</i> Accession from Mississippi" @default.
- W3048391188 doi "https://doi.org/10.4236/ajps.2020.118085" @default.
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