It was hypothesized that Mn uptake efficiency and transport by transgenic, glifosate-resistant soybean would be affected by application of the herbicide. Two experiments were carried out to study manganese uptake, long-distance transport and absorption kinetics of genetically modified soybean as affected by glifosate application. Experiment 1: The treatments consisted of two near-isogenic soybean cultivars grown in nutrient solution (Conquista and Valiosa RR with or without application of glifosate). The Mn levels in the nutrient solution were 0, 0.085, 0.125, 0.250, […]

Detrimental effects of glyphosate on plant mineral nutrition have been reported in the literature, particularly on Mn uptake and redistribution. However, in most of the experiments conducted so far glyphosate-susceptible plants were used. Effects of glyphosate on Mn absorption kinetics, accumulation, and distribution within the plant, as well as soybean response to Mn as affected by glyphosate were studied in three experiments. In the first experiment, in nutrient solution, the effect of glyphosate on soybean Mn uptake kinetic parameters (Imax, […]