Document Detail

Nitrogen metabolism and seed composition as influenced by glyphosate application in glyphosate-resistant soybean.
MedLine Citation:
PMID:  18363356     Owner:  NLM     Status:  MEDLINE    
Previous research has demonstrated that glyphosate can affect nitrogen fixation or nitrogen assimilation in soybean. This 2-year field study investigated the effects of glyphosate application of 1.12 and 3.36 kg of ae ha(-1) on nitrogen metabolism and seed composition in glyphosate-resistant (GR) soybean. There was no effect of glyphosate application on nitrogen fixation as measured by acetylene reduction assay, soybean yield, or seed nitrogen content. However, there were significant effects of glyphosate application on nitrogen assimilation, as measured by in vivo nitrate reductase activity (NRA) in leaves, roots, and nodules, especially at high rate. Transiently lower leaf nitrogen or (15)N natural abundance in high glyphosate application soybean supports the inhibition of NRA. With the higher glyphosate application level protein was significantly higher (10.3%) in treated soybean compared to untreated soybean. Inversely, total oil and linolenic acid were lowest at the high glyphosate application rate, but oleic acid was greatest (22%) in treated soybean. These results suggest that nitrate assimilation in GR soybean was more affected than nitrogen fixation by glyphosate application and that glyphosate application may alter nitrogen and carbon metabolism.
Nacer Bellaloui; Robert M Zablotowicz; Krishna N Reddy; Craig A Abel
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Publication Detail:
Type:  Journal Article     Date:  2008-03-26
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  56     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2008 Apr 
Date Detail:
Created Date:  2008-04-16     Completed Date:  2008-07-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2765-72     Citation Subset:  IM    
Crop Genetics and Production Research Unit, Agricultural Research Service, US Department of Agriculture, 141 Experiment Station Road, Stoneville, Mississippi 38776, USA.
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MeSH Terms
Drug Resistance / genetics*
Glycine / administration & dosage,  analogs & derivatives*
Nitrate Reductase / metabolism
Nitrogen / analysis,  metabolism*
Nitrogen Fixation / drug effects
Plant Leaves / enzymology
Plant Roots / enzymology
Plant Stems / enzymology
Plants, Genetically Modified / drug effects*
Root Nodules, Plant / chemistry
Seeds / chemistry*
Soybeans / drug effects*,  genetics,  metabolism
Reg. No./Substance:
1071-83-6/glyphosate; 56-40-6/Glycine; 7727-37-9/Nitrogen; EC Reductase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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