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'Anthocyanins' in keywords Facet   Publication Year 1985  [X]
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1985[X]
1Author    J.M F G Aerts, A. W. SchramRequires cookie*
 Title    Isolation of Vacuoles from the Upper Epidermis of Petunia Hybrida Petals I. A Comparison of Isolation Procedures  
 Abstract    Vacuoles were isolated from the upper epiderm is o f petals o f Petunia hybrida line R27 using three different procedures. U tilizing the vacuolar localization o f anthocyanin, vacuolar prep­ arations obtained through polybase treatment, osm otic shock and m echanical forces were com ­ pared on purity, yield and stability. The com parison indicated that application o f the polybase procedure results in the best vacuolar preparations. Vacuoles could be obtained which m ain­ tained their acidic pH and retained their anthocyanin content. 
  Reference    Z. Naturforsch. 40c, 189—1 (1985); received June 26/O ctober 26 1984 
  Published    1985 
  Keywords    Petunia hybrida, Vacuoles, Protoplasts, Anthocyanins 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0189.pdf 
 Identifier    ZNC-1985-40c-0189 
 Volume    40 
2Author    J.M F G Aerts, A. W. SchramRequires cookie*
 Title    Isolation of Vacuoles from the Upper Epidermis of Petunia Hybrida Petals ü . Vacuolar Localization of Some Hydrolases  
 Abstract    In vacuoles isolated from petal upper epiderm is o f Petunia hybrida through polybase-induced lysis o f protoplasts the vacuolar localization o f x-m annosidase and x-galactosidase was dem on­ strated. N o association was observed between the tonoplast and these hydrolases. Protoplasts from different mutant lines blocked in anthocyanin biosynthesis were treated with DEAE-dextran to release vacuoles. The differences in quality o f the obtained vacuolar preparations indicated the relation between mutant line used and successful application o f the polybase-procedure. 
  Reference    Z. Naturforsch. 40c, 196 (1985); received June 26/O ctober 26 1984 
  Published    1985 
  Keywords    Petunia hybrida, Vacuoles, Anthocyanins, Flavonoids, H ydrolases 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0196.pdf 
 Identifier    ZNC-1985-40c-0196 
 Volume    40 
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