The woodland strawberry, Fragaria vesca is a model fruit for a number of rosaceous crops. We have engineered altered concentrations of anthocyanin in F. vesca, to determine the impact on plant growth and fruit quality. Anthocyanin concentrations were significantly increased by over-expression or decreased by knock-down of the R2R3 MYB activator, MYB10. In contrast, a potential bHLH partner for ...

Variegated plants are highly valuable in the floricultural market, yet the genetic mechanism underlying this attractive phenomenon has not been completely elucidated. In this study, we identified and measured different compounds in pink and white flower petals of peach (Prunus persica) by high-performance liquid chromatography and liquid chromatography/mass spectrometry analyses. No cyanidin-ba...

In the present study, we investigated the effect of anthocyanidins on human topoisomerases I and II and its relevance for DNA integrity within human cells. Anthocyanidins bearing vicinal hydroxy groups at the B-ring (delphinidin, DEL; cyanidin, CY) were found to potently inhibit the catalytic activity of human topoisomerases I and II, without discriminating between the IIalpha and the IIbeta is...

The degradation of the six anthocyanidins (pelargonidin, cyanidin, delphinidin, peonidin, petunidin and malvidin) mediated by the nitroxides: 2,2,6,6-tetramethylpiperidine-1-oxyl (Tempo), 4-hydroxy2,2,6,6-tetramethylpiperidine-1-oxyl (Tempol) and 4-methoxy-2,2,6,6-tetramethylpiperidine1-oxyl (4CH3O-Tempo) at 25 oC in aqueous acid solution was investigated spectrophotometrically and by EPR and H...

Dihydroflavonol-4-reductase (DFR; EC1.1.1.219) catalyzes a key step late in the biosynthesis of anthocyanins, condensed tannins (proanthocyanidins), and other flavonoids important to plant survival and human nutrition. Two DFR cDNA clones (MtDFR1 and MtDFR2) were isolated from the model legume Medicago truncatula cv Jemalong. Both clones were functionally expressed in Escherichia coli, confirmi...

N earlier studies concerned with the genetic regulation of pigmentation in the I garden balsam, Impatiens balsamina, the genes which determine the nature of anthocyanin pigmentation were found in individual cases to regulate also the structure of leucoanthocyanins (ALSTON and HAGEN 1958) and flavonols (CLEVENGER 1958). Thus the dominant gene H , while increasing the quantity of pelargonidin der...

Determining the harvest date of table grapes is very important to achieve high-quality bunches with adequate soluble solids content, low titratable acidity, and high concentrations polyphenols. Table grape consumption has increased worldwide due its phenolic compound content beneficial effects on human health. Thus, this study aimed characterize ripening ‘BRS Vitoria’ seedless at different stag...

Abstract Background Plants have remarkable diversity in petal colour through the biosynthesis and accumulation of various pigments. To better understand mechanisms regulating pigmentation Lonicera japonica , we used multiple approaches to investigate changes carotenoids, anthocyanins, endogenous hormones gene expression dynamics during transitions, i.e., green bud petals (GB_Pe), white flower (...

The synthesis of nanoparticles from plant extracts has become an interesting line research in recent years. purpose the study was silver (AgNPs) nitrate, aqueous and ethanol 80% obtained by ultrasound-assisted extraction, as well fractions chloroform, ethyl acetate water, flower petals leaves Hibiscus rosa-sinensis L. ethanolic extract H. analyzed UHPLC-ESI-Q-Orbitrap- MS/MS identifying pelargo...

They occur primarily as glycosides or acylglycosides of their respective aglycone anthocyanidins. There are almost seventeen natural anthocyanidins; however, only 6 of them, cyanidin, delphinidin, petunidin, peonidin, pelargonidin, and malvidin are universally distributed [3]. Over 600 naturally occurring ACNs have been reported differing in (a) the number and position of hydroxyl and methoxyl ...