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'Glyphosate' in keywords
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1995 (1)
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1Author    Jochen Berlin, Ludger WitteRequires cookie*
 Title    Effects of Glyphosate on Shikimic Acid Accumulation in Tobacco Cell Cultures with Low and High Yields of Cinnamoyl Putrescines  
 Abstract    To study the flow of carbon through the shikimate pathway in tobacco cell cultures with low and high yields o f cinnamoyl putrescines, the cell cultures were treated with glyphosate. In the presence o f glyphosate the levels o f free shikimic acid were increased more than 300-fold by both cell lines. Despite of a normally 10-fold higher level o f cinnamoyl putrescines, the high yielding cell line accumulated only 25% more free shikimic acid than the low yielding cell line. This result together with earlier observations indicated that the increased formation o f cinnamoyl putrescines was rather limited by the activity o f phenylalanine ammonia lyase than by increased substrate supply caused by alterations in the shikimate pathway. 
  Reference    Z. Naturforsch. 36c, 210 (1981); received November 27 1980 
  Published    1981 
  Keywords    Nicotiana tabacum, Suspension Cultures, Shikimic Acid, Cinnamoyl Putrescines, Glyphosate 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0210.pdf 
 Identifier    ZNC-1981-36c-0210 
 Volume    36 
2Author    Vassya St, NedyalkaV. Bankova3, Dim Handjieva3, L. Itar, ZarkaY. Djilianovb, RositsaI. Vassilevab, AtanasI. Bachvarovab, Atanasov, KamenL. Stefanov3, SimeonS. Popov3Requires cookie*
 Title    Polyphenol and Alkaloid Changes in Glyphosate-Treated Tobacco Regenerants Selected for Herbicide Tolerance  
 Abstract    In vitro a one-step selection for glyphosate tolerance of two Bulgarian tobacco cultivars Zlatna Arda and Nevrokop A 24 was carried out. After treatment with glyphosate of the control plants and their regenerants polyphenol and alkaloid changes were determined. A decrease in the polyphenol concentrations and an in­ crease in the alkaloid concentrations were registered only for Zlatna Arda. 
  Reference    Z. Naturforsch. 50c, 313 (1995); received July 1/Novem ber 29 1994 
  Published    1995 
  Keywords    Glyphosate, Tobacco, in vitro Selection, Chlorogenic Acid, Rutin, Alkaloids 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0313_n.pdf 
 Identifier    ZNC-1995-50c-0313_n 
 Volume    50 
3Author    U. Margna, L. Laanest, E. Margna, T. VainjärvRequires cookie*
 Title    L-Tyrosine as a Precursor of Flavonoids in Buckwheat Cotyledons  
 Abstract    Exogenous L-tyrosine was incorporated 1 3 -1 4 tim es less effectively than exogenous L-phenyl-alanine into flavonoids in excised cotyledons o f 3 days old buckw heat seedlings but proved to be an only 5 times poorer precursor when the experim ents were carried out with 5 days old material. Simultaneous administration o f L-phenylalanine m arkedly reduced incorporation o f L-tyrosine into flavonoids. A similar decrease in the utilization o f exogenous L-tyrosine for flavonoid b io­ synthesis occurred in kinetin-treated cotyledons. H owever, in cotyledons treated with high doses o f glyphosate, an inhibitor o f the shikim ic acid pathway, an increase in the formation o f flavonoids from exogenously supplied L-tyrosine was observed. Under all conditions the relative incorporation rate o f exogenous L-tyrosine was highest for anthocyanins and lowest for C-glyco-sylflavones while within the latter class o f com pounds the luteolinic derivatives orientin and iso-orientin incorporated more label than their apigeninic analogues vitexin and isovitexin. PAL and TAL activities were found to be present in the cotyledons in a ratio o f 50:1. The possible role o f L-tyrosine as an alternative natural precursor for the biosynthesis o f flavonoids and other related polyphenols is discussed. 
  Reference    Z. Naturforsch. 40c, 154 (1985); received April 24/O ctober 29 1984 
  Published    1985 
  Keywords    Anthocyanins, Flavonoids, Biosynthesis, [14C-L]Tyrosine, [14C-L]Phenylalanine, Kinetin, Glyphosate, Fagopyrum esculentum 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0154.pdf 
 Identifier    ZNC-1985-40c-0154 
 Volume    40