Articles
UDPG 7-O-GLUCOSYLTRANSFERASE ACTIVITY IN FLOWER EXTRACTS OF CHRYSANTHEMUM SEGETUM
Article number
381_13
Pages
152 – 153
Language
Abstract
As a rule, yellow colouration of flowers is provided by carotenoids.
The yellow colour of Chrysanthemum segetum petals however, is mainly due to the presence of the 7 – glucosides of quercetin and particularly gossypetin which only differs from quercetin by a hydroxy group in the 8 – position of ring A (see Fig. 1).
The yellow colour of Chrysanthemum segetum petals however, is mainly due to the presence of the 7 – glucosides of quercetin and particularly gossypetin which only differs from quercetin by a hydroxy group in the 8 – position of ring A (see Fig. 1).
While the biosynthetic steps to the formation of flavonols including quercetin are well established (Heller and Forkmann, 1988), A – ring hydroxylation in vitro has not been achieved.
The presence of the 7 – glucosides of both quercetin and gossypetin in C. segetum petals suggests that 7 – glucosylation of simple flavonols possibly precedes A – ring hydroxylation.
Thus, in context with the elucidation of the formation of gossypetin and its 7 – glucoside we studied first the glucosylation reaction.
Authors
K. Stich, F. Wurst, G. Forkmann
Keywords
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