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Corso M.,University of Padua | Ziliotto F.,University of Padua | Rizzini F.M.,University of Padua | Teo G.,Centro Interdipartimentale per la Ricerca in Viticoltura Ed Enologia CIRVE | And 3 more authors.
Plant Science | Year: 2013

At ripening, Vitis vinifera cv Raboso Piave grapes have high acidity, which results in an astringent wine that is not easy to drink. To overcome this limitation, several researches have attempted to alter the polyphenols profile mainly by applying different harvest techniques. The aim of this work was to investigate sensorial, biochemical, and molecular changes in Raboso Piave grape berries subjected to delayed harvests as Late Harvest (LH) and "Double Maturation Raisonnée" (DMR) techniques. At the molecular level, a microarray study was conducted comparing Traditional Harvest berries (TH) to LH and DMR ones. Gene ontology enrichment analysis pointed out that LH and DMR techniques affected metabolism of acids, sugars and polyphenols. A Principal Component Analysis, performed on transcriptomic data, pointed out that malate catabolism as well as some branches of flavonoids biosynthesis are significantly affected by DMR. In DMR grape berries, the flavonol and catechin accumulations were induced and depressed, respectively. In parallel, the transcription of flavonol synthase and leucoanthocyanidin-reductase 2, the main genes responsible for flavonol and catechin biosynthesis, were similarly induced and down-regulated. These changes resulted in a brighter colored wine with lower astringency. © 2013 Elsevier Ireland Ltd.

Corso M.,University of Padua | Corso M.,Centro Interdipartimentale per la Ricerca in Viticoltura Ed Enologia CIRVE | Vannozzi A.,University of Padua | Vannozzi A.,Centro Interdipartimentale per la Ricerca in Viticoltura Ed Enologia CIRVE | And 19 more authors.
Journal of Experimental Botany | Year: 2015

In light of ongoing climate changes in wine-growing regions, the selection of drought-tolerant rootstocks is becoming a crucial factor for developing a sustainable viticulture. In this study, M4, a new rootstock genotype that shows tolerance to drought, was compared from a genomic and transcriptomic point of view with the less drought-tolerant genotype 101.14. The root and leaf transcriptome of both 101.14 and the M4 rootstock genotype was analysed, following exposure to progressive drought conditions. Multifactorial analyses indicated that stress treatment represents the main factor driving differential gene expression in roots, whereas in leaves the genotype is the prominent factor. Upon stress, M4 roots and leaves showed a higher induction of resveratrol and flavonoid biosynthetic genes, respectively. The higher expression of VvSTS genes in M4, confirmed by the accumulation of higher levels of resveratrol in M4 roots compared with 101.14, was coupled to an up-regulation of several VvWRKY transcription factors. Interestingly, VvSTS promoter analyses performed on both the resequenced genomes highlighted a significantly higher number of W-BOX elements in the tolerant genotype. It is proposed that the elevated synthesis of resveratrol in M4 roots upon water stress could enhance the plant's ability to cope with the oxidative stress usually associated with water deficit. © 2015 The Author.

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