terclim by ICS banner
IVES 9 IVES Conference Series 9 Reduced berry skin epi-cuticular wax and cutin accumulation associates with a genomic deletion and increased polyphenols extractability in a clone of Tempranillo Tinto 

Reduced berry skin epi-cuticular wax and cutin accumulation associates with a genomic deletion and increased polyphenols extractability in a clone of Tempranillo Tinto 

Abstract

Tempranillo Tinto (TT) is the third-most planted red wine variety in the world, and it is mostly grown in the Iberian Peninsula. Spontaneous somatic variation appearing during vegetative propagation can be exploited to improve elite varieties as Tempranillo Tinto, including the selection of new phenotypes enhancing berry quality. We described previously that a somatic variant of TT with darker fruit color, the clone VN21, exhibits increased extractability of polyphenols during the winemaking process. To unravel the molecular mechanism underlying this phenomenon, we performed whole-genome resequencing to compare VN21 to other TT clones, revealing a 10 Mb deletion in chromosome 11 that likely affected only the L1 meristem cell layer of VN21 and tissues derived from it, such as external cell layers of berry skin. A putative loss-of-function allele of an ABCG32 gene (homologous to cuticle biogenesis transporters), was left hemizygous in this segment after the deletion in VN21. Scanning electron microscopy images suggested a lower content epi-cuticular wax in the berry cuticle of VN21, which likely leads to the shiny colour of VN21 berries. A GC-MS analysis of epi-cuticular waxes and cutins extracted from berry skin and leaves confirmed a general decrease in the accumulation of cuticle constituent compounds in VN21, supporting a role for the mutated ABCG32 transporter in the phenotype. Our findings show that somatic mutations altering berry cuticle biogenesis can have an effect on the extractability of polyphenols from the berry skin, which could be exploited for varietal wine innovation.

DOI:

Publication date: June 13, 2024

Issue: Open GPB 2024

Type: Poster

Authors

Carolina Royo1*, Yolanda Ferradás1,2, Robin Bosman 3, Fernando Alba-Elías 4, Javier Ibáñez 1, Justin Lashbrooke 3, José Miguel Martínez-Zapater 1, Pablo Carbonell-Bejerano 1

1 Instituto de Ciencias de la Vid y del Vino, Finca La Grajera, Ctra. de Burgos Km. 6, 26007 Logroño. Spain
2 Current address: Facultad de Biología, Universidad de Santiago de Compostela, 15872 Santiago de Compostela. Spain
3 South African Grape and Wine Research Institute, Stellenbosch University, Stellenbosch, South Africa
4 Universidad de La Rioja, Departamento de Ingeniería Mecánica, Logroño, Spain

Contact the author*

Keywords

somatic variation, whole genome resequencing, deletion, waxes, GC-MS

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

Valorisation of nutraceutical and health-related properties of wine-grapes of Emilia-Romagna Italian region

In this work, results about the composition in polyphenols and polyamines in important wine-grape cultivars from the Emilia-Romagna region are presented. Spectrophotometric and HPLC analyses suggest that especially coloured berries are particularly rich of antioxidant species (stilbenes and catechins). Potential allergenic capability of biogenic amines was also characterized.

Second pruning as a strategy to delay maturation in cv. ‘Touriga nacional’ in the Portuguese Douro region

The advance in maturation of wine grapes is an important climate change risk related effect that could affect warm regions like Portuguese Douro Wine Region. Indeed, the climate analysis over the past years registered a decrease in the precipitation, significant higher average temperatures, and a more frequent occurrence of extreme weather events, including heat waves. In these conditions the length from anthesis until maturation is shortened and the uncoupling of technical and phenolic maturity results in berries with higher sugar concentration (and lower acidity), but lower anthocyanins, tannins, and total phenolic concentration, which produce unbalanced wines.
In this work, an innovative strategy of crop forcing, based on forcing vine regrowth after a second pruning of green shoots, was tested, aimed at delaying ripening until the temperature becomes lower and, therefore, preventing acidity loss and increasing anthocyanin-to-sugar ratio. The experiments were conducted in 2019 and 2020 in a commercial vineyard of ‘Touriga Nacional’ located in the Douro Region. Crop forcing was conducted 15 (CF1) to 30 (CF2) days after fruit set. Vines pruned with conventional methods were used as control (CF0). Results confirmed that fruit ripening was shifted from the hot season (August/September), until a cooler period (October through early-November). At harvest, grapevine berries from CF1 and CF2 presented lower pH and higher acidity, than control, with no significant differences in colour intensity and phenolic levels composition. Sugar content was lower in CF2-treated vines in both seasons. However, in CF-treated vines the number and size of clusters were significantly lower (up to 88% reduction) than in control plants. A metabolomics analysis of mature berries from CF-treated vines and control is underway. Crop forcing was indeed effective in producing a more balance berry composition but severely reduced grapevine yield,

The estimation of the clear-sky effective PAR resources in a mountain area

Irrigation of vineyards is a matter of controversial arguments at areas of high quality wine production. Besides, the effects of the water in the plant are closer related to the water availability than to the irrigation regime.

Application of an in vitro digestion model to study the bioaccessibility and the effect of the intestinal microbiota on the red wine proanthocyanidins 

Proanthocyanidins are important phenolic fraction for wine quality, contributing to astringency, bitterness and color. Their metabolism begins in the mouth and continues throughout the gastrointestinal tract; however, most of them are accumulated in the colon where are metabolized by the intestinal microbiota, giving rise to a whole series of phenolic acids that may have greater activity at physiological level than the precursors[1]. This study aimed to evaluate in vitro the bioaccessibility of proanthocyanidins in a red wine developed by Bodegas Pradorey, as well as to evaluate the potential effect of intestinal microbiota on polyphenols metabolism identifying and quantifying secondary metabolites.

Consequences of apical leaf removal on grapevine water status, heat damage, yield and grape ripening on Pinot n and Chardonnay

Climate change presents a significant challenge to grape growing worldwide as increased temperatures lead to wines with increased sugar and pH levels. Manipulation of the exposed leaf area is a powerful lever governing the assimilation and storage of non-structural carbohydrates in grapevines. Reducing the leaf-to-fruit ratio is now considered as a tool for adapting to hotter and dryer grape growing conditions.