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Glyphosate Uptake by Suspension-Cultured Potato (Solanum tuberosum and S. brevidens) Cells

Published online by Cambridge University Press:  12 June 2017

James D. Burton
Affiliation:
Dep. Agron., Univ. of Wisconsin, Madison, WI 53706
Nelson E. Balke
Affiliation:
Dep. Agron., Univ. of Wisconsin, Madison, WI 53706

Abstract

Characteristics of glyphosate [N-(phosphonomethyl)glycine] uptake for as long as 3 days by plant cells were studied using suspension-cultured potato (Solanum tuberosum L. cv. ‘Red Pontiac’ and S. brevidens Phil.) cells. An experimental system was developed wherein uptake was assayed in a reduced salt medium that minimized cell growth yet maintained cell viability. Glyphosate uptake was nonlinear over time; an immediate rapid uptake phase was followed by uptake at a decreased rate that continued through 72 h. Glyphosate uptake was the same in both an experimental uptake medium (reduced salt and sucrose, no hormones) and in the complete growth medium used for routine cell growth. The pattern of glyphosate uptake was similar with both Red Pontiac and S. brevidens cells, though uptake was greater in Red Pontiac cells. Glyphosate uptake was not inhibited by 1 mM CaSO4, MgSO4, MnSO4, or ZnSO4. Rather, uptake was inhibited by the absence of salts at 8 h, and ZnSO4 and MnSO4 increased uptake. Similarly, increasing concentrations (0 to 5 mM) of CaSO4 and CaCl2 did not inhibit uptake, whereas the absence of either salt of Ca2+ decreased uptake. Increasing concentrations of (NH4)2 SO4 (0 to 150 mM) did not affect glyphosate uptake, but (NH4)2 SO4 at 50 mM and above was toxic to the cells.

Type
Physiology, Chemistry, and Biochemistry
Copyright
Copyright © 1988 by the Weed Science Society of America 

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