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'Monocotyledonous Crops' in keywords Facet   section ZfN Section C  [X]
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1991 (1)
1Author    Klaus Kreuz, John Gaudin, Jürg Stingelin, Edith EbertRequires cookie*
 Title    Metabolism of the Aryloxyphenoxypropanoate Herbicide, CGA 184927, in Wheat, Barley and Maize: Differential Effects of the Safener, CGA 185072  
 Abstract    The influence o f the safener, CGA 185072 (5-chloro-8-quinolinoxy-acetic acid-l-methyl-hexyl-ester), on the metabolism of the aryloxyphenoxypropanoate herbicide, CGA 184927 (2-propynyl-/?-2-[4-(5-chloro-3-fluoro-2-pyridinyloxy)-phenoxy]-propionate), was studied in excised leaves of wheat, barley, and maize. In wheat and barley, CGA 184927 readily under­ went ester hydrolysis followed by hydroxylation at the pyridinyl moiety as well as ether cleav­ age between the pyridinyl and the phenyl ring. Ether cleavage constituted the minor pathway in both species. All metabolites were subject to glycosyl conjugation. Tetcyclacis strongly in­ hibited pyridinyl-ring hydroxylation in wheat. M etabolism by hydroxylation and ether cleav­ age was more rapid in wheat than in barley, and was found to be accelerated in the presence of the safener CGA 185072 in both wheat and, to a lesser degree, in barley. Moreover, the safener increased the capacity for O-glycoside form ation in wheat as suggested from studies using the ,4C-labelled pyridinyl-ring hydroxylated metabolite as a precursor. In maize, which is highly susceptible to CGA 184927, rapid ester hydrolysis of CGA 184927 and partial conversion of the corresponding carboxylic acid to glycosyl ester conjugate(s) occurred. However, no further transform ation of the herbicide was found in maize, both in the absence or presence of CGA 185072. It is concluded that the ability o f CGA 185072 to protect wheat from injury by the herbicide, CGA 184927, and to confer partial protection to barley, is related to the ability of the safener to stimulate herbicide metabolism in these crop species. 
  Reference    Z. Naturforsch. 46c, 901—9 (1991); received M arch 26 1991 
  Published    1991 
  Keywords    Aryloxyphenoxypropanoate Herbicide, Safener, Herbicide M etabolism, Monocotyledonous Crops, Glycosyl Conjugation 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0901.pdf 
 Identifier    ZNC-1991-46c-0901 
 Volume    46