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Showing papers on "Isovitexin published in 1979"


Journal ArticleDOI
01 Jan 1979-Planta
TL;DR: Protoplasts isolated from 6-d-old primary leaves of barley contain an enzyme which transfers the glucosyl moiety of uridine-diphosphateglucose to isovitexin, resulting in the formation of saponarin, the major flavonoid of barley.
Abstract: Protoplasts isolated from 6-d-old primary leaves of barley (Hordeum vulgare L.) contain an enzyme which transfers the glucosyl moiety of uridine-diphosphateglucose to isovitexin, resulting in the formation of saponarin, the major flavonoid of barley. Purified chloroplasts isolated from protoplasts contained less than 2% of the total glucosyltransferase activity. These chloroplasts were 97% intact, based on ribulose-bisphosphate-carboxylase activity. Similarly low levels of glucosyltransferase activity were found in mitochondria and microbody or microsomal preparations from protoplasts. The soluble fraction (cytosol) contained at least 93% of the isovitexin 7-O-glucosyltransferase activity.

25 citations


Journal ArticleDOI
TL;DR: The genetically controlled O -glycosylation of the 6- C -glucosyl residue of isovitexin in the petals of Melandrium album has been shown to take place in the 2″-position, by MS of the corresponding permethylated isovitesin glycosides.

18 citations


Journal ArticleDOI
TL;DR: The results are discussed in terms of the balance of biosynthesis and degradation of flavonoids in the primary leaf throughout its development from juvenile to senescent stages under field conditions.

16 citations


Journal ArticleDOI
TL;DR: In petals of Silene dioica plants, an enzyme has been demonstrated which catalyses the transfer of the arabinose moiety of UDP-arabinose to the hydroxyl group on the 2″-position of the carbon-carbon bound glucose of isovitexin.

12 citations


Journal ArticleDOI
TL;DR: The B-ring hydroxylation pattern influences the pH at which the substrate has optimal affinity for the enzyme, suggesting that the carbon-carbon bound glucose on a the flavonoid skeleton is of importance for enzyme activity.

6 citations


Journal ArticleDOI
TL;DR: The results support previous suggestions that flavone patterns in leaf tissues are derived from the basal meristem and that they remain unaltered during subsequent growth.

3 citations


Journal ArticleDOI
01 Nov 1979-Botany
TL;DR: The major flavonoid complement of the Minuartia rossii complex has been determined and evidence for the probable existence of two additional glycosylation genes is presented.
Abstract: The major flavonoid complement of the Minuartia rossii complex has been determined. Nine flavonoid glycosides have been identified based on the common aglycones quercetin and kaempferol and the rarer C-glycoflavone isovitexin. One compound (apigenin-6-C-arabi-nosylglucosyl 7-O-glucoside) was found to be of limited distribution, being present in M. rossii and M. elegans and absent in M. austromontana. The flavonoid kaempferol 3-p-coumaroylglucoside found in the complex is relatively uncommon and therefore of chemosystematic interest. With respect to their flavonoid profiles, no differences were noted between the two chromosome races of M. elegans and no geographical variation was observed in the three taxa of the complex. The genetics of isovitexin glycosylation are discussed and evidence for the probable existence of two additional glycosylation genes is presented.

3 citations