Document Detail

Auxin herbicides: current status of mechanism and mode of action.
MedLine Citation:
PMID:  19823992     Owner:  NLM     Status:  MEDLINE    
Synthetic compounds that act like phytohormonal 'superauxins' have been among the most successful herbicides used in agriculture for more than 60 years. These so-called auxin herbicides are more stable in planta than the main natural auxin, indole-3-acetic acid (IAA), and show systemic mobility and selective action, preferentially against dicot weeds in cereal crops. They belong to different chemical classes, which include phenoxycarboxylic acids, benzoic acids, pyridinecarboxylic acids, aromatic carboxymethyl derivatives and quinolinecarboxylic acids. The recent identification of receptors for auxin perception and the discovery of a new hormone interaction in signalling between auxin, ethylene and the upregulation of abscisic acid biosynthesis account for a large part of the repertoire of auxin-herbicide-mediated responses, which include growth inhibition, senescence and tissue decay in sensitive dicots. An additional phenomenon is caused by the quinolinecarboxylic acid quinclorac, which also controls grass weeds. Here, the accumulation of phytotoxic levels of tissue cyanide, derived ultimately from quinclorac-stimulated ethylene biosynthesis, plays a key role in eliciting the herbicidal symptoms in sensitive grasses.
Klaus Grossmann
Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Pest management science     Volume:  66     ISSN:  1526-4998     ISO Abbreviation:  Pest Manag. Sci.     Publication Date:  2010 Feb 
Date Detail:
Created Date:  2010-01-12     Completed Date:  2010-03-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100898744     Medline TA:  Pest Manag Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  113-20     Citation Subset:  IM    
BASF Agricultural Centre Limburgerhof, D-67117 Limburgerhof, Germany.
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MeSH Terms
Gene Expression Regulation, Plant / drug effects
Herbicides / chemistry,  metabolism,  pharmacology*
Indoleacetic Acids / chemistry,  metabolism,  pharmacology*
Poaceae / drug effects*,  genetics,  growth & development,  metabolism
Signal Transduction / drug effects
Reg. No./Substance:
0/Herbicides; 0/Indoleacetic Acids

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

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