Journal
WEED SCIENCE
Volume 57, Issue 1, Pages 1-5Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1614/WS-08-089.1
Keywords
Absorption; corn; glufosinate; metabolism; translocation
Categories
Funding
- Bayer CropScience
- North Carolina Cotton Growers Association
- Cotton Incorporated
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Greenhouse studies were conducted to evaluate C-14-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 C-14-glufosinate was greater than 90% 24 HAT in sicklepod. Significant levels of translocation were observed in glufosinate-resistant corn, with C-14-glufosinate translocated to the region above the treated leaf and the roots Lip to 41 and 27%, respectively. No significant translocation was detected in any of the weed species at any harvest timing. Metabolites of C-14-glufosinate were detected in glufosinate-resistant corn and all weed species. Seventy percent of C-14 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.
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