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Aminocyclopyrachlor Absorption and Translocation in Three Aquatic Weeds

Published online by Cambridge University Press:  20 January 2017

Trevor D. Israel ,
Wesley J. Everman  and
Robert J. Richardson
Trevor D. Israel
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695
Wesley J. Everman
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695
Robert J. Richardson*
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695
*
Corresponding author's E-mail: [email protected].
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Abstract

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Studies were conducted to evaluate 14C-aminocyclopyrachlor absorption and translocation in alligatorweed, waterhyacinth, and waterlettuce. Alligatorweed plants were treated at the seven-node stage, waterhyacinth was treated at the five-leaf stage, and waterlettuce was treated at the eight-leaf stage. All plants were pretreated with nonlabeled aminocyclopyrachlor at 0.14 kg ai ha−1 with 1% (v/v) methylated seed oil (MSO). 14C-aminocyclopyrachlor was then applied to a protected leaf, and plants were harvested at 1, 2, 4, 12, 24, and 96 h after treatment (HAT). Radioactivity was determined in the treated leaf, shoots above treated leaf, shoots below treated leaf, roots, and growing solution. Absorption was rapid in all species and reached a maximum of 73, 72, and 73% of applied radioactivity for alligatorweed, waterhyacinth, and waterlettuce, respectively. In alligatorweed at 96 HAT, 43% of absorbed carbon-14 (14C) was translocated to shoots above the treated leaf and 17% was translocated to lower shoot tissue. In waterhyacinth at 96 HAT, 56% of absorbed 14C remained in the treated leaf, whereas 14 and 13% were found in parts above and below the treated leaf, respectively. In waterlettuce at 96 HAT, 50 and 33% of absorbed radioactivity was located above the treated leaf and in the growing solution, respectively. The low recovery of aminocyclopyrachlor in alligatorweed roots and growing solution might explain regrowth potential after herbicide treatment. These results also indicate that the lack of waterlettuce control with aminocyclopyrachlor is not due to reduced absorption or translocation.

Keywords

Aminocyclopyrachloralligatorweed, Alternanthera philoxeroides (Mart.) Griseb. ALRPHwaterhyacinth, Eichhornia crassipes (Mart.) Solms EICCRwaterlettuce, Pistia stratiotes L. PIIST.Herbicide translocationherbicide uptake
Type
Physiology/Chemistry/Biochemistry
Information
Weed Science , Volume 63 , Issue 1 , March 2015 , pp. 248 - 253
Creative Commons
Creative Common License - CCCreative Common License - BYCreative Common License - NCCreative Common License - ND
This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-No Derivatives licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits noncommercial re-use, distribution, and reproduction in any medium, provided the original work is unaltered and is properly cited.
Copyright
Copyright © Weed Science Society of America

Footnotes

Current address: Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996.

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