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  • Flavonoid  (3)
  • Springer  (3)
  • Oxford University Press
  • 1980-1984  (3)
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  • Springer  (3)
  • Oxford University Press
Years
  • 1980-1984  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Modification of the B-ring during flavonoid synthesis in Petunia hybrida: Effect of the hydroxylation gene Hf1 on dihydroflavonol intermediates (1981)
    Springer
    Planta 153 (1981), S. 462-465 
    Details
    ISSN: 1432-2048
    Keywords: Anthocyanin ; Flavonoid ; Hydroxylation (flavonoids) ; Petunia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The white flowering mutant W48 of Petunia hybrida is dominant for the hydroxylation gene Hf1 and homozygous recessive for the hydroxylation gene Ht1 and the anthocyanin gene An1. Flower buds of this mutant accumulate dihydrokaempferol-glucosides. Thus the effect of Hf1 being dominant is not the hydroxylation of the C15 skeleton, as is the case in mutants that are able to synthesize anthocyanins. This can be explained either by a feed-back inhibition of the hydroxylation by small amounts of dihydromyricetin (glucosides), or by a controlling effect of the gene An1 on the expression of Hf1. However, the white flowering mutant W58, which is homozygous recessive for the gene An6 and dominant for Hf1, accumulates dihydromyricetin (glucosides). This excludes a possible feed-back inhibition by dihydromyricetin and we conclude that An1 controls the expression of Hf1. Feeding of radioactive malonic acid to isolated flower limbs of mutants able to synthesize anthocyanins, leads to the incorporation of radioactivity into dihydrokaempferol (glucosides) and dihydroquercetin (glucosides). These results show that glucosylation of dihydroflavonols is a normal event in anthocyanin biosynthesis and is not induced by an inhibition of anthocyanin synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394987
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  • 2
    Electronic Resource
    Electronic Resource
    Glucosylation of flavonoids in petals of Petunia hybrida (1981)
    Springer
    Planta 153 (1981), S. 459-461 
    Details
    ISSN: 1432-2048
    Keywords: Anthocyanin ; Flavonoid ; Glucosylation (flavonoids) ; Petunia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract During the biosynthesis of anthocyanins in Petunia hybrida, the 3-hydroxyl group is glucosylated. Their supposed biosynthetic precursors, the dihydroflavonols, are glucosylated at the 7 or 4′ positions. The question arose of whether these glucosides or the aglucones act as a substrate in anthocyanin synthesis. Using isolated flower buds of white flowering mutants that were blocked in an earlier step of biosynthesis, it was found that anthocyanin-3-glucosides and dihydroquercetin-7-glucoside were synthesized if dihydroquercetin, dihydroquercetin-7-glucoside, or dihydroquercetin-4′-glucoside were used as precursors in these experiments. Intracellular dihydroquercetin-glucosides were not used as a substrate for anthocyanin synthesis. The results are explained by deglucosylation of dihydroquercetin-glucosides during uptake by isolated flower limbs. Dihydroquercetin-7-glucoside, formed intracellularly, is not available as a precursor for anthocyanins. We conclude that the aglucone form of dihydroquercetin acts as a substrate in anthocyanin biosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394986
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  • 3
    Electronic Resource
    Electronic Resource
    Hydroxylation of cinnamic acids and flavonoids during biosynthesis of anthocyanins in Petunia hybrida Hort. (1982)
    Springer
    Planta 154 (1982), S. 546-549 
    Details
    ISSN: 1432-2048
    Keywords: Anthocyanin ; Cinnamic acid (hydroxylation) ; Flavonoid ; Petunia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of hydroxylation genes on the hydroxylation of intermediates of flavonoid biosynthesis in Petunia hybrida is reported. In mutants homozygous recessive, for the gene An9, dihydroflavonols accumulate. The number of hydroxyl groups in the B-ring is determined by the hydroxylation genes Htl and Hfl. A similar effect of Htl and (probably) Hfl occurs in flavanone-accumulating mutants, homozygous recessive for the gene An3. Mutants dominant for Hfl probably accumulate a 5,7,3′,4′,5′-pentahydroxyflavanone. The mutant W43, homozygous recessive for the gene An5, is blocked in an early flavonoid biosynthesis step. It accumulates p-coumaric acid together with caffeic acid. The hydroxylation genes Htl and Hfl, however, are also homozygous recessive, which indicates that the hydroxylation of p-coumaric acid to caffeic acid or derivatives of these compounds is not controlled by Htl. The accumulation of caffeic acid was observed in all mutants investigated so far, regardless of which hydroxylation genes were dominant or recessive. We conclude that hydroxylations involved in anthocyanin biosynthesis occur at the C15 level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00402998
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