GiESCO 2019 banner
IVES 9 IVES Conference Series 9 GiESCO 9 GiESCO 2019 9 Climate change 9 Changes in flavonol profile are a reliable indicator to assess the exposure of red grape berries to solar radiation and canopy architecture

Changes in flavonol profile are a reliable indicator to assess the exposure of red grape berries to solar radiation and canopy architecture

Abstract

Context and purpose of the study ‐ Exposure to solar radiation affects berry composition through photomorphogenesis or changes in temperature. Flavonol synthesis is upregulated by UV‐B radiation leaving a fingerprint on flavonol profile. This study aimed to test the factors affecting flavonol accumulation and profile and their potential as an indicator to assess the overall exposure of red wine grape berry to solar radiation.

Material and methods ‐ We performed three experiments to study the response of flavonol accumulation and profile to (1) three different solar radiation exclusion treatments (shading nets) during berry development; (2) canopy porosity and leaf area index (LAI); and (3) natural variability of vine vigour and canopy management practices.

Results ‐ Results showed a strong relationship between global radiation, inverse dormant pruning weights or canopy porosity (inversely proportional to LAI) and % kaempferol or % quercetin. Furthermore, the increase in concentration of the above two flavonols was associated with a reduction of % myricetin. Total flavonol content, % kaempferol, % quercetin and % myricetin had significant correlations with inverse dormant pruning weights, but these were less sensitive to over‐ripening or water deficits. Flavonol profile was associated to site hydrology (wetness index) through changes in vigour, and to LAI; and responded to shoot thinning or fruit‐zone leaf removal. Flavonol profile was also correlated to the maximal temperature reached by the clusters. These results support the reliability of the flavonol profile as an assessment parameter for studies aiming to discuss canopy architecture or the effect of solar radiation on grapevine berries.

Download the PDF

DOI:

Publication date: June 19, 2020

Issue: GiESCO 2019

Type: Article

Authors

Johann MARTÍNEZ‐LÜSCHER (1), Luca BRILLANTE (2,3), S. Kaan KURTURAL (1)

(1) Department of Viticulture and Enology University of California, Davis, U.S.A.
(2) Department of Viticulture and Enology California State University, Fresno, U.S.A.

Contact the author

Keywords

flavonoids, solar radiation, temperature, fruit ripening, grape composition, precision agriculture, UV‐B radiation

Tags

GiESCO 2019 | IVES Conference Series

Citation

Related articles…

Phenolic profiles of minor red grape cultivars autochthonous from the Spanish region of La Mancha

The phenolic profiles of little known red grape cultivars, namely Garnacho, Moribel and Tinto Fragoso, which are autochthonous from the Spanish region of La Mancha (ca. 600,000 ha of vineyards) have been studied over the consecutive seasons of years 2013 and 2014. The study was separately performed over the skins, the pulp and the seeds, and comprised the following phenolic types: anthocyanins, flavonols, hydroxycinnamic acid derivatives (HCADs), total proanthocyanidins (PAs) and their structural features. The selected grape cultivars belong to the Vine Germplasm Bank created in this region in order to preserve the great diversity of genotypes grown in La Mancha.

Read More

Contribution of grape and oak wood barrels to pyrrole content in wines – Influence of several cooperage parameters

Chardonnay is the world’s most planted white grape variety and has met a great commercial success for decades.

Read More

Valutazione dell’equilibrio vegeto-produttivo con metodiche di proximal sensing

Nel biennio 2008-2009, nell’ambito di un progetto multidisciplinare coordinato e finanziato dal Consorzio Tuscania, 4 vigneti in differenti zone della Toscana sono stati monitorati con strumenti di proximal sensing al fine di valutare la variabilità riscontrabile e ottenere delle indicazioni sulle risposte vegetative delle piante e quanti-qualitative delle produzioni.

Read More

Environment friendly nutrition supplying and soil cultivation methods applicable in the upper zone of hillside vineyards

Somló is Hungary’s smallest wine district, however one of the best producing white wines. The majority of vineyard areas are located on the slopes of Somló-hill, situated at the point where the Kisalföld meets Bakonyalja

Read More

Correlations between N,S,O-heterocycle levels and age of Champagne base wines

Champagne regulation allows winegrowers to stock small amounts of still wines in order to compensate vintages’ quality shifts mainly due to climate variations. According to their technical requirements and house style some Champagne producers (commonly named “Champagne houses”) use these stored wines in the blend in order to introduce an element of complexity. These wines possess the particularity of being aged on fine lees in thermo-regulated stainless steel tanks. The Champagne house of Veuve Clicquot Ponsardin has several wines stored this way.

Read More