Document Detail


Oxaziclomefone, a new herbicide, inhibits wall expansion in maize cell-cultures without affecting polysaccharide biosynthesis, xyloglucan transglycosylation, peroxidase action or apoplastic ascorbate oxidation.
MedLine Citation:
PMID:  16144873     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND AND AIMS: Oxaziclomefone (OAC), a new herbicide, inhibits cell expansion, especially in roots and cell-cultures of gramineous monocots. OAC does not affect turgor in cultured maize cells, and must therefore inhibit wall-loosening or promote wall-tightening. METHODS: The effects of OAC in living cultured maize cells on various biochemical processes thought to influence wall extension were studied. KEY RESULTS: OAC did not affect 14C-incorporation from D-[U-14C]glucose into the major sugar residues of the cell wall (cellulosic glucose, non-cellulosic glucose, arabinose, xylose, galactose, mannose or uronic acids). OAC had no effect on 14C-incorporation from trans-[U-14C]cinnamate into wall-bound ferulate or its oxidative coupling-products. OAC did not influence the secretion or in-vivo action of peroxidase or xyloglucan endotransglucosylase activities-proposed wall-tightening and -loosening activities, respectively. The herbicide did not affect the consumption of extracellular L-ascorbate, an apoplastic solute proposed to act as an antioxidant and/or to generate wall-loosening hydroxyl radicals. CONCLUSIONS: OAC decreased wall extensibility without influencing the synthesis or post-synthetic modification of major architectural wall components, or the redox environment of the apoplast. The possible value of OAC as a probe to explore aspects of primary cell wall physiology is discussed.
Authors:
Nichola O'Looney; Stephen C Fry
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-09-06
Journal Detail:
Title:  Annals of botany     Volume:  96     ISSN:  0305-7364     ISO Abbreviation:  Ann. Bot.     Publication Date:  2005 Nov 
Date Detail:
Created Date:  2005-10-18     Completed Date:  2006-02-03     Revised Date:  2009-10-19    
Medline Journal Info:
Nlm Unique ID:  0372347     Medline TA:  Ann Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  1097-107     Citation Subset:  IM    
Affiliation:
The Edinburgh Cell Wall Group, Institute of Molecular Plant Sciences, School of Biological Sciences, The University of Edinburgh, Daniel Rutherford Building, The King's Buildings, Mayfield Road, Edinburgh EH9 3JH, UK.
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MeSH Terms
Descriptor/Qualifier:
Ascorbic Acid / metabolism*
Cell Enlargement / drug effects
Cell Wall / drug effects*
Cells, Cultured
Cinnamates / metabolism
Glucans / metabolism*
Glycosylation
Glycosyltransferases / metabolism
Herbicides / chemistry,  pharmacology
Molecular Structure
Oxazines / chemistry,  pharmacology*
Oxidation-Reduction
Peroxidase / metabolism*
Polysaccharides / biosynthesis*
Time Factors
Xylans / metabolism*
Zea mays / cytology,  drug effects*,  enzymology
Chemical
Reg. No./Substance:
0/Cinnamates; 0/Glucans; 0/Herbicides; 0/Oxazines; 0/Polysaccharides; 0/Xylans; 0/oxaziclomefone; 37294-28-3/xyloglucan; 50-81-7/Ascorbic Acid; EC 1.11.1.7/Peroxidase; EC 2.4.-/Glycosyltransferases; EC 2.4.1.207/xyloglucan - xyloglucosyltransferase

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