 IVES 9 IVES Conference Series 9 Macrowine 9 Macrowine 2021 9 Grapevine diversity and viticultural practices for sustainable grape growing 9 Chemical composition of cool-climate Sauvignon blanc grape skins clones during ripening

Chemical composition of cool-climate Sauvignon blanc grape skins clones during ripening

Abstract

AIM: Sauvignon blanc is the most important variety in cool valleys in central Chile accounting 15,522 ha which corresponds to 42.4% of the cultivated surface with white varieties in Chile (SAG, 2019). Casablanca Valley, one of the most important area for the production of white wines in Chile is located approximately to 35-40 km from the Pacific Ocean. Still, geographical area and the clone utilized could be decisive for the chemical and sensory characteristics of this type of wine (Duchene et al., 2009; Green et al., 2011), both during ripening and during ageing of wine. For this reason, the aim of this work is to study the concentration and composition of phenolic compounds and organic acids throughout ripening in grape skins of Sauvignon blanc clones grown in two zones of Casablanca Valley.

METHODS: Sauvignon blanc clones 242, 1 Davis and 107 grown in two zones of the Casablanca Valley, central zone of Chile were chosen. The grape berries were sampled every 15 days from veraison until commercial harvest, using a completely randomized design with five replicates in each selected vineyard. The following chemical analyses were assessed: titratable acidity, total soluble solids, total phenols, CIELab coordinates, low molecular weight phenolic profile and organic acids using High Performance Liquid Chromatography (HPLC-DAD).

RESULTS: As expected, titratable acidity diminished during ripening while total soluble solids and pH increased in all clones. Total phenols decreased in all clones during ripening, with significant differences in their concentration between the two geographical zones. Low molecular weight phenolic compounds showed differences in concentration between Sauvignon blanc clones and geographical origin showed that the grapes grown in the zone more closed to the Pacific Ocean had a higher concentration of flavonols, while organic acids differed in concentration but not in composition between clones and geographical origin.

CONCLUSIONS

We observed differences in concentration on some chemical parameters between Sauvignon blanc clones that depends on the geographical origin, while its composition remains similar.

DOI:

Publication date: September 2, 2021

Issue: Macrowine 2021

Type: Article

Authors

Alejandro Cáceres

Faculty of Agronomic and Food Sciences, Pontificia Universidad Católica de Valparaíso, Chile.,Pierina Peirano Faculty of Agronomic and Food Sciences, Pontificia Universidad Católica de Valparaíso, Chile.

Contact the author

Keywords

Sauvignon blanc, flavonols, organic acids, cool-climate wines

Citation

Microbial ecosystems in wineries – molecular interactions between species and modelling of population dynamics

Microbial ecosystems are primary drivers of viticultural, oenological and other cellar-related processes
such as wastewater treatment. Metagenomic datasets have broadly mapped the vast microbial species
diversity of many of the relevant ecological niches within the broader wine environment, from vineyard
soils to plants and grapes to fermentation. The data highlight that species identities and diversity
significantly impact agronomic performance of vineyards as well as wine quality, but the complexity
of these systems and of microbial growth dynamics has defeated attempts to offer actionable
tools to guide or predict specific outcomes of ecosystem-based interventions.

Climatic potential to produce grapes for wine-making in the tropical north region of Minas Gerais State, Brazil

The tropical north region of Minas Gerais State is one of the least developed of Brazil and viticulture could be an alternative to develop its agriculture zone. The objective of this work was to evaluate the wine grape production climatic potential of that region.

Field-grown Sauvignon Blanc berries react to increased exposure by controlling antioxidant homeostasis and displaying UV acclimation responses that are influenced by the level of ambient light

Leaf removal in the bunch zone is a common viticultural practice with several objectives, yet it has been difficult to conclusively link the physiological mechanism(s) and metabolic berry impact to this widely practiced treatment. We used a field-omics approach1 in a Sauvignon blanc high altitude model vineyard, showing that the early leaf removal in the bunch zone caused quantifiable and stable responses (over years) in the microclimate where the main perturbation was increased exposure. We provide an explanation for how leaf removal leads to the shifts in grape metabolites typically linked to this treatment and confirm anecdotal evidence and previous reports that leaf removal treatment at an early stage of berry development affects “quality-associated” metabolites (monoterpenes and norisoprenoids).

La zonazione della D.O.C. Bolgheri (Castagneto C.): aspetti metodologici ed applicativi

The results of the first step of the zoning study carried out in Bolghery appellation area (Castagneto Carducci, Tuscany) in the 1993-1995 period have been recently published. Quality factors of Bolgheri appellation and different “terroirs ” were identified.

DNA-free genome editing confers disease resistance in grapevine varieties

The grapevine is facing significant challenges due to climate change, as rising temperatures impact its physiological traits and disrupt plant phenology.