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'Biosynthesis' in keywords Facet   Publication Year 1985  [X]
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1Author    NigelC P Baldwin, BarrieW. Bycroft, PaulM. Dewick, John Gilbert, Ian HoldenRequires cookie*
 Title    Biosynthesis of Trichothecene My cotoxins in Fusarium culmorum Cultures  
 Abstract    A high yielding production of the trichothecene mycotoxin 3-acetyldeoxynivalenol (3-AcDON) in cultures of Fusarium culmorum is described. By supplying [14C]acetate, 14C-labelled 3-AcDON suitable for further metabolic studies has been obtained. The pattern of labelling has been ascertained by using 13C-labelled acetate precursors, and is in line with established biosynthetic data. A second trichothecene produced in significant amounts by F. culmorum has been identified as 3a, 15-diacetoxy-7a, 8a-dihydroxy-12, 13-epoxytrichothec-9-ene (7a, 8 a-dihydroxycalonec-trin). 
  Reference    Z. Naturforsch. 40c, 514—518 (1985); received May 8 1985 
  Published    1985 
  Keywords    Mycotoxin, Trichothecene, Fusarium, Biosynthesis, 3-Acetyldeoxynivalenol 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0514.pdf 
 Identifier    ZNC-1985-40c-0514 
 Volume    40 
2Author    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