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Multiple Herbicide Resistance Evolution: The Case of Eleusine indica in Brazil

2021; American Chemical Society; Volume: 69; Issue: 4 Linguagem: Inglês

10.1021/acs.jafc.0c03999

1520-5118

José G. Vázquez-García, Ricardo Alcántara‐de la Cruz, Antonia M. Rojano‐Delgado, Candelario Palma‐Bautista, João M. de Portugal Vasconcelos, Rafael De Prado,

Allelopathy and phytotoxic interactions

The occurrence of multiple herbicide resistant weeds has increased considerably in glyphosate-resistant soybean fields in Brazil; however, the mechanisms governing this resistance have not been studied. In its study, the target-site and nontarget-site mechanisms were characterized in an Eleusine indica population (R-15) with multiple resistance to the acetyl-CoA carboxylase (ACCase) inhibitors, glyphosate, imazamox, and paraquat. Absorption and translocation rates of 14C-diclofop-methyl14C-imazamox and 14C-glyphosate of the R-15 population were similar to those of a susceptible (S-15) population; however, the R-15 population translocated ∼38% less 14C-paraquat to the rest of plant and roots than the S-15 population. Furthermore, the R-15 plants metabolized (by P450 cytochrome) 55% and 88% more diclofop-methyl (conjugate) and imazamox (imazamox–OH and conjugate), respectively, than the S-15 plants. In addition, the Pro-106-Ser mutation was found in the EPSPS gene of this population. This report describes the first characterization of the resistance mechanisms in a multiple herbicide resistant weed from Brazil.