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…

Etude préliminaire des influences pédoclimatiques sur les caractéristiques quali-quantitatives du cépage aglianico dans une zone de la province de benevento-ltalie

The need to classify the vineyards of an area according to the quality of its wines is not recent, but it is only in the last ten years that studies on the suitability of different areas for the cultivation of vineyard take on an integrated and interdisciplinary character (Boselli, 1991). The definition of the suitability of the environment is thus obtained by making the climatic, pedological, topographical and cultural information interact with the vegetative, productive and qualitative expression of the grape varieties.

Read More

Using remotely sensed (UAV) and in situ field measurements to describe grapevine canopy characteristics

Row orientation and canopy management are essential for high quality grapevine production. Microclimatic conditions of the leaves and fruits can be influenced by the canopy geometry. Remote sensing is a very promising tool to describe vegetative growth and physiological behavior of vineyards. However, the correlation between remotely sensed data and in situ field measurements has been described scarcely in the scientific literature so far. The aim of the study was to correlate remotely sensed data obtained with Unmanned Aerial Vehicle (UAV) with in situ field measurements to describe canopy structure.

Read More

Foliar application of urea improved the nitrogen composition of Chenin grapes

The nitrogen composition of the grapes directly affects the developments of alcoholic fermentation and influences the final aromatic composition of the wines. The aim of this study was to determine the effect and efficiency of foliar applications of urea on the nitrogen composition of grapes. This study was carried out during 2023 vintage and in the Chenin vineyard located in Estacion Experimental Mendoza (Argentina). Three urea concentrations 3, 6 and 9 Kg N/ha (C1, C2, and C3, respectively) and control (T) were applied in this vineyard at veraison.

Read More

The influence of different fertiliser applications and canopy management practices on the potassium content and pH of juice and wine of Vitis vinifera L. cvs. Cabernet-Sauvignon and Cabernet franc

In an attempt to reduce the pH of juice and wine, different fertiliser applications and canopy management practices were evaluated in South Africa in a field trial. Fertiliser treatments entailed no, CaSO4, Ca(OH)2, and MgSO4 fertilisation.

Read More

Trials with machine harvested sauvignon blanc: the importance of grape transport time and temperature

It is well known that free varietal thiols, in particular 3-mercaptohexanol (3MH) and 3-mercaptohexyl ace-tate (3MHA), are important constituents to the aroma of New Zealand Sauvignon blanc wines.

Read More