Abstract: A mutant blocked in anthocyanin synthesis leads to an accumulation of 4,2',4',6'-tetrahydroxy chalcone-2'-glucoside (isosalipurposide) in blossoms of Callistephus chinensis (L.) Nees, whereas in geno types with the wild-type allele, higher oxidized flavo noids and anthocyanins are synthesized. Measure ments of chalcone-flavanone isomerase activity of 18 lines of Callistephus chinensis showed a clear correla tion between accumulation of chalcone in the reces sive genotypes (ch ch) and deficiency of this enzyme activity. Both the chemogenetic and the enzymologic evidence lead to the following conclusions: 1. The first product of the synthesis of the flavonoid skeleton should be tetrahydroxychalcone. — 2. The chalcone flavanone isomerase catalyzes the formation of flava none from chalcone in a stereospecific way and there with furnishes the substrate for the further reactions in the flavonoid biosynthesis.
Publication Year: 1978
Publication Date: 1978-01-01
Language: en
Type: article
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