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Correlation of Leaf Damage with Uptake and Translocation of Glyphosate in Velvetleaf (Abutilon theophrasti)

Published online by Cambridge University Press:  12 June 2017

Paul C. C. Feng ,
Jan S. Ryerse  and
R. Douglas Sammons
Paul C. C. Feng
Affiliation:
Agricultural Sector, Monsanto Company GG5G, St. Louis, MO, 63198
Jan S. Ryerse
Affiliation:
Department of Pathology, St. Louis University Health Sciences Center, St. Louis, MO 63104
R. Douglas Sammons
Affiliation:
Agricultural Sector, Monsanto Company GG5G, St. Louis, MO 63198
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Abstract

Uptake and translocation of glyphosate in three commercial formulations were examined in velvetleaf, a dicotyledonous weed that is commonly treated with glyphosate. The formulations included Roundup® (MON 35085), Roundup Ultra, and Touchdown® as sold in Canada. A minimal amount of 14C-glyphosate was spiked into a lethal rate of each formulation, and the short-term (3 to 72 h) uptake into the treated leaf and subsequent translocation into the plant were measured. Time-course studies showed very rapid uptake and translocation of glyphosate in the Ultra formulation. In comparison, the uptake and translocation of glyphosate in Touchdown was much slower but continued throughout the 72-h period. Glyphosate in the Roundup formulation showed intermediate uptake and translocation. Tissue necrosis at the application sites of Ultra and Roundup was visible within 24 h after treatment. Examinations using stereo and fluorescence microscopy revealed extensive cell death and tissue disruption. Tissue necrosis from Ultra and Roundup was also observed in blank formulations containing no glyphosate and therefore was likely caused by the surfactants. In contrast, the application sites of Touchdown produced little to no leaf damage. Our results demonstrated a direct correlation between tissue necrosis and rapid rates of glyphosate uptake and translocation.

Keywords

Glyphosate, N-(phosphonomethyl)glycinevelvetleaf, Abutilon theophrasti Medik. #3 ABUTHUptaketranslocationglyphosateformulationsurfactanttissue damageHAT, hours after treatment
Type
Research
Information
Weed Technology , Volume 12 , Issue 2 , June 1998 , pp. 300 - 307
Copyright
Copyright © 1998 by the Weed Science Society of America 

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