Effects of calcium, magnesium, and phosphate on glyphosate absorption by cultured plant cells
1991
Mervosh, T.L. | Balke, N.E.
Effects of several inorganic ions on short-term glyphosate absorption by cultured plant cells were determined by measuring the glyphosate content of cells exposed to inorganic salts in a 0.01-mM glyphosate solution buffered at pH 5.7. Within 10 min, glyphosate absorption by potato and velvetleaf cells was stimulated about equally by 1.5 millimoles CaCl2 or 1.5 millimoles MgCl2 but was not affected by 1.5 millimoles KCl. Glyphosate absorption by both species increased linearly with log10 CaCl2 concentration; for velvetleaf cells, the response was greatest for CaCl2 concentrations greater than 0.2 millimoles. Over time of absorption, glyphosate concentration within velvetleaf cells approached an asymptote. Addition of 0.1 millimoles KH2PO4 inhibited glyphosate absorption by potato cells in the presence or absence of Ca2+ and Mg2+ salts; all other K+ salts tested had no effect. Glyphosate absorption by potato, velvetleaf, soybean, corn, and rice cells was stimulated by 5.0 millimoles CaCl2 but was inhibited by 0.1 millimoles KH2PO4 in the presence of 0.05 or 5.0 millimoles CaCl2.
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