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Absence of a Role for Absorption, Translocation, and Metabolism in Differential Sensitivity of Hemp Dogbane (Apocynum cannabinum) to Two Pyridine Herbicides

Published online by Cambridge University Press:  12 June 2017

Michael S. Orfanedes ,
Loyd M. Wax  and
Rex A. Liebl
Michael S. Orfanedes
Affiliation:
Dep. Agron., Univ. Illinois, Urbana. IL 61801
Loyd M. Wax
Affiliation:
Crop Prot. Res. Unit. U.S. Dep. Agric., Agric. Res. Serv., Univ. Illinois, Urbana. IL 61801
Rex A. Liebl
Affiliation:
Dep. Agron., Univ. Illinois, Urbana. IL 61801
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Abstract

Hemp dogbane is sensitive to fluroxypyr and tolerant to clopyralid. Absorption, translocation, and metabolism of clopyralid and fluroxypyr were studied in hemp dogbane to determine if differences in these processes could be responsible for differential sensitivity. In addition, the effect of growth stage on herbicide absorption and translocation was evaluated. The 14C-herbicides were applied to the adaxial side of a single leaf located near the midpoint of hydroponically cultured plants. Uptake of fluroxypyr was more rapid than clopyralid. At 72 h after treatment (HAT), fluroxypyr and clopyralid absorption was 62 and 38%, respectively. Clopyralid was much more mobile than fluroxypyr, with 75% of the absorbed 14C from 14C-clopyralid recovered outside the treated leaf compared to only 45% for fluroxypyr 72 HAT. Relative to fluroxypyr, a higher percentage of 14C-clopyralid recovered outside the treated leaf translocated acropetally, especially when plants were treated during the vegetative stage. Treatment during the early reproductive stage increased basipetal and reduced acropetal translocation relative to the vegetative stage. Neither herbicide was metabolized rapidly. Approximately 60 and 90% of the recovered 14C was attributable to unaltered fluroxypyr and clopyralid, respectively, 72 HAT. Some differences in absorption, translocation, and metabolism between clopyralid and fluroxypyr exist, but they cannot fully account for differential sensitivity of hemp dogbane to these two herbicides. Differences in activity at the target site may be responsible for differential activity of these herbicides on hemp dogbane.

Keywords

Clopyralid, 3,6-dichloro-2-pyridinecarboxylic acidfluroxypyr, [(4-amino-3,5-dichloro-6(fluoro-2-pyridinyl)oxy]acetic acidhemp dogbane, Apocynum cannabinum L. # APCCAUptaketranslocationmetabolismselectivityAPCCA

Information

Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 41 , Issue 1 , March 1993 , pp. 1 - 6
Copyright
Copyright © 1993 by the Weed Science Society of America 

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