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Effect of Glyphosate on Intact Bean Plants (Phaseolus vulgaris L.) and Isolated Cells ¹

Department of Agronomy, Cornell University, Ithaca, New York 14853

Whole bean (var. "Eastern Butterwax") plants and isolated cells were used to investigate possible mechanisms of action of glyphosate [N-(phosphonomethyl)glycine]. Results showed that glyphosate was quickly absorbed by the whole plant but not by individual cells and that it caused a rapid reduction in leaf dry matter accumulation, leaf expansion, leaf angle, and stomatal aperture without affecting the water status of the plant. Glyphosate also caused a rapid reduction in cellular uptake of ⁸⁶Rb and ³²P which preceded its detrimental effects on photosynthesis, RNA and protein synthesis, and respiration of isolated cells. This reduction in ion absorption was not due to a loss of membrane integrity, decrease in energy supply or chelation of ions. It was concluded that glyphosate was directly inhibiting the ion absorption process of bean leaf cells.

¹ Research taken from the PhD thesis of B. J. B., 1976. Agronomy Series Paper 1352.