Translocation of Glyphosate, Quizalofop, and Sucrose in Quackgrass (Elytrigia repens) Biotypes

Abstract

The translocation pattern and distribution in rhizomes of14C-glyphosate,14C-quizalofop, and14C-sucrose was examined in five quackgrass biotypes. Translocation of radioactivity in the different plant parts varied among biotypes. Translocation in the whole plant after treatment with the three14C-chemicals varied among biotypes but was not correlated with their tolerance to herbicides. Detailed analysis of distribution of radioactivity in the primary rhizome showed that more14C was found in the apical sections after treatment with14C-sucrose. A similar pattern was observed after14C-glyphosate application with all biotypes except one. Very low radioactivity was found in rhizomes after14C-quizalofop application, but a preferential accumulation in apical sections of the primary rhizome was detected in two biotypes. The tolerance of one biotype to glyphosate was explained by the absence of radioactivity accumulation in the apical sections of the rhizome.