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Chemical and Physical Effects of the Accumulation of Glyphosate in Common Milkweed (Asclepias syriaca) Root Buds

Published online by Cambridge University Press:  12 June 2017

Mark A. Waldecker  and
Donald L. Wyse
Mark A. Waldecker
Affiliation:
Dep. Agron. and Plant Genetics, Univ. Minnesota, St. Paul, MN 55108
Donald L. Wyse
Affiliation:
Dep. Agron. and Plant Genetics, Univ. Minnesota, St. Paul, MN 55108
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Abstract

Distribution of 14C-glyphosate [N-(phosphonomethyl)glycine] in chemically treated and physically manipulated common milkweed [Asclepias syriaca (L.) ♯ ASCSY] was studied in greenhouse and growth chamber experiments. Pretreatment with glyphosate at 0.6 and 1.1 kg ae/ha 3 days prior to 14C-glyphosate application to leaves reduced the concentration of 14C recovered from shoots and leaves above the 14C-glyphosate-treated leaves but had no influence on the concentration of 14C in proximal root buds. Partial removal of the shoot and root prior to the application of 14C-glyphosate increased bud respiration and the concentration of 14C in the proximal root buds. Proximal root buds treated with 1 mM of 6-benzyl-aminopurine (BAP) for 6 days (3 days prior to application of 14C-glyphosate) contained seven times more 14C/mg than root buds of BAP-untreated plants, suggesting that dormant buds could be chemically stimulated to accumulate higher concentrations of glyphosate. BAP-treated buds were killed by foliar applications of glyphosate at 1.1 kg/ha, indicating that proximal root buds can be stimulated to acquire lethal concentrations of glyphosate.

Keywords

Bud dormancycytokininsbenzyl-adeninetranslocationASCSY
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 33 , Issue 5 , September 1985 , pp. 605 - 611
Copyright
Copyright © 1985 by the Weed Science Society of America 

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