Multiple Herbicide Resistance Evolution: The Case of <i>Eleusine indica</i> in Brazil

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