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Absorption, Translocation, and Metabolism of Glufosinate in Transgenic and Nontransgenic Cotton, Palmer Amaranth (Amaranthus palmeri), and Pitted Morningglory (Ipomoea lacunosa)

Published online by Cambridge University Press:  20 January 2017

Wesley J. Everman ,
Walter E. Thomas ,
James D. Burton ,
Alan C. York  and
John W. Wilcut
Wesley J. Everman*
Affiliation:
Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
Walter E. Thomas
Affiliation:
Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
James D. Burton
Affiliation:
Box 7609, North Carolina State University, Raleigh, NC 27695-7609
Alan C. York
Affiliation:
Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
John W. Wilcut
Affiliation:
Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
*
Corresponding author's E-mail: [email protected]
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Abstract

Greenhouse studies were conducted to evaluate absorption, translocation, and metabolism of 14C-glufosinate in glufosinate-resistant cotton, nontransgenic cotton, Palmer amaranth, and pitted morningglory. Cotton plants were treated at the four-leaf stage, whereas Palmer amaranth and pitted morningglory were treated at 7.5 and 10 cm, respectively. All plants were harvested at 1, 6, 24, 48, and 72 h after treatment (HAT). Absorption of 14C-glufosinate was greater than 85% 24 h after treatment in Palmer amaranth. Absorption was less than 30% at all harvest intervals for glufosinate-resistant cotton, nontransgenic cotton, and pitted morningglory. At 24 HAT, 49 and 12% of radioactivity was translocated to regions above and below the treated leaf, respectively, in Palmer amaranth. Metabolites of 14C-glufosinate were detected in all crop and weed species. Metabolism of 14C-glufosinate was 16% or lower in nontransgenic cotton and pitted morningglory; however, metabolism rates were greater than 70% in glufosinate-resistant cotton 72 HAT. Intermediate metabolism was observed for Palmer amaranth, with metabolites comprising 20 to 30% of detectable radioactivity between 6 and 72 HAT.

Keywords

GlufosinatePalmer amaranth, Amaranthus palmeri S.Wats. AMAPApitted morningglory, Ipomoea lacunosa L. IPOLAcotton, Gossypium hirsutum L.Absorptioncottonglufosinatemetabolismtranslocation
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 57 , Issue 4 , August 2009 , pp. 357 - 361
Copyright
Copyright © Weed Science Society of America 

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