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Absorption, Translocation, and Metabolism of 14C-Chlorsulfuron in Canada Thistle (Cirsium arvense)

Published online by Cambridge University Press:  12 June 2017

Phil J. Petersen  and
Beth A. Swisher
Phil J. Petersen
Affiliation:
Dep. Agron., Univ. of Nebraska, Lincoln, NE 68583
Beth A. Swisher
Affiliation:
Dep. Agron., Univ. of Nebraska, Lincoln, NE 68583
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Abstract

Absorption of 14C-chlorsulfuron {2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino] carbonyl] benzenesulfonanide} by Canada thistle [Cirsium arvense (L.) Scop. # CIRAR] was 39% following foliar treatment and 16% when added to a nutrient solution in which the plants were growing. Translocation from the treated organ was limited regardless of treatment method; 10% of the applied 14C moved out of the treated leaf and 10% moved from the roots to other parts of the plant following absorption from the nutrient solution. When applied as a foliar treatment, 14C-chlorsulfuron had not been metabolized by Canada thistle 48 h later. However, when 14C-chlorsulfuron was added to the nutrient solution and absorbed by the roots, nearly 25% of the 14C in the plants was present as a polar product(s), 13% had an Rf value identical to benzenesulfonamide standards, and the remaining 62% was chlorsulfuron. Chlorsulfuron was not transformed similarly in a nutrient solution after 6 days in the absence of plants. Suppression of regrowth was the primary injury symptom observed following chlorsulfuron application. Chlorsulfuron also reduced whole plant weight and root bud number and weight.

Keywords

Perennial weedsCIRAR
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 33 , Issue 1 , January 1985 , pp. 7 - 11
Copyright
Copyright © 1985 by the Weed Science Society of America 

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