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South African Journal of Enology and Viticulture

On-line version ISSN 2224-7904
Print version ISSN 0253-939X

Abstract

MU, L. et al. Tissue-specific accumulation of flavonoids in grape berries is related to transcriptional expression of VvF3'H and VvF3'5'H. S. Afr. J. Enol. Vitic. [online]. 2014, vol.35, n.1, pp.68-81. ISSN 2224-7904.

The products and the related gene expression of flavonoid metabolism were examined in the skin and pulp of Yan73 (Vtis vinifera L. cv.) grapes, a teinturier variety cultivated in China, and the data were compared with those in the skin and pulp of Cabernet Sauvignon (Vitis vinifera L. cv.) grapes, a well-known red variety. The results showed that, in comparison with the skins of Cabernet Sauvignon, the skins of Yan73 berries were characterised by fewer types of flavonols and anthocyanins, a higher level of flavonoids, and a much lower percentage of 3'-hydroxylated flavonols. Flavonoid metabolism was also present in the pulp of Yan73, and the percentages of 3'-hydroxylated flavonols and 3'-hydroxylated flavan-3-ols were significantly higher than the percentages of their corresponding 3',5'-hydroxylated forms. Only flavan-3-ols were found in the pulp of Cabernet Sauvignon. The expression of VvmybAl exhibited a co-ordination with the accumulation of anthocyanins in the pulp of the teinturier cultivar, which showed great similarity to that in the skin. A good correlation was found between the expression of VvF3'H and 3'-hydroxylated flavonoids, as well as between the expression of VvF3'5'H and 3',5'-hydroxylated flavonoids in the skin and pulp of the grape berries. It is suggested that tissue-specific accumulation of flavonoids in grape berries is related to the transcriptional expression of VvF3'H and VvF3'5'H.

Keywords : Flavonols; flavan-3-ols; anthocyanins; gene expression; teinturier cultivar Yan73.

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