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Absorption, Translocation, and Metabolism of 14C-Glufosinate in Glufosinate-Resistant Corn, Goosegrass (Eleusine indica), Large Crabgrass (Digitaria sanguinalis), and Sicklepod (Senna obtusifolia)

Published online by Cambridge University Press:  20 January 2017

Wesley J. Everman ,
Cassandra R. Mayhew ,
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
Cassandra R. Mayhew
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 14C-glufosinate absorption, translocation, and metabolism in glufosinate-resistant corn, goosegrass, large crabgrass, and sicklepod. Glufosinate-resistant corn plants were treated at the four-leaf stage, whereas goosegrass, large crabgrass, and sicklepod were treated at 5, 7.5, and 10 cm, respectively. All plants were harvested at 1, 6, 24, 48, and 72 h after treatment (HAT). Absorption was less than 20% at all harvest intervals for glufosinate-resistant corn, whereas absorption in goosegrass and large crabgrass increased from approximately 20% 1 HAT to 50 and 76%, respectively, 72 HAT. Absorption of 14C-glufosinate was greater than 90% 24 HAT in sicklepod. Significant levels of translocation were observed in glufosinate-resistant corn, with 14C-glufosinate translocated to the region above the treated leaf and the roots up to 41 and 27%, respectively. No significant translocation was detected in any of the weed species at any harvest timing. Metabolites of 14C-glufosinate were detected in glufosinate-resistant corn and all weed species. Seventy percent of 14C was attributed to glufosinate metabolites 72 HAT in large crabgrass. Less metabolism was observed for sicklepod, goosegrass, and glufosinate-resistant corn, with metabolites composing less than 45% of detectable radioactivity 72 HAT.

Keywords

Glufosinategoosegrass, Eleusine indica L. Gaertn.large crabgrass, Digitaria sanguinalis L.sicklepod, Senna obtusifolia (L.) H.S. Irwin & Barneby.corn, Zea mays LAbsorptioncornglufosinatemetabolismtranslocation
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 57 , Issue 1 , February 2009 , pp. 1 - 5
Copyright
Copyright © Weed Science Society of America 

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