 IVES 9 IVES Conference Series 9 Macrowine 9 Macrowine 2021 9 Grapevine diversity and viticultural practices for sustainable grape growing 9 Foliar application of specific inactivated yeast to enhance the varietal aroma precursors accumulation on cv. Traminer

Foliar application of specific inactivated yeast to enhance the varietal aroma precursors accumulation on cv. Traminer

Abstract

AIM: The production of grapes with a balanced composition is one of the main goals that agronomists and oenologists pursue to produce premium quality wines. The gap between technological (sugar/acid ratio) and aromatic maturity is expanding due to the increasing temperature and lack of rainfall during the ripening phase. In three consecutive years 2017, 2018 and 2019 we have evaluated the elicitor effect of the foliar application of a specific inactivated yeasts (LalVigne Aroma, Lallemand Inc) on the vine’s secondary metabolism with a specific effect on the aroma precursors accumulation.

METHODS: The experiment took place in Trentino Alto Adige (Italy) in a commercial vineyard of Vitis vinifera L. cv. Traminer. The application of the specific inactivated yeasts was performed according to the producers guidelines, two foliar treatments at 3 kg/ha each, the first at the beginning of veraison and the second ten days later. At harvest specific measurements were taken to assess the effect on grape quality and on organoleptic characteristic of the subsequent wines: yield, biochemical parameter, the free and glycosylated aromatic precursors in grapes with GC/MS.

RESULTS: In the three studied vintages there was not effect of the treatment on yield and biochemical parameter (sugar, pH, titratable acidity), while there was a significant impact on the aroma precursors. In both forms (free and glycosylated) the total amount of aroma precursors was higher in the treated grapes, in particular nerol, β-citronellol, geraniol, geranic acid and benzyl alcohol showed a significant increase. Thiols precursors of 3MH were significantly higher in treated plants. Organoleptic evaluation of the wines confirmed chemicals result.

CONCLUSIONS:

The results confirmed that the foliar application of the specific inactivated yeast tested in our trials positively impacted on grape and wine aroma profile without affecting the sugar accumulation and acidity degradation. This application is an efficient agronomic tool able to modify the secondary metabolism of the vines related to aroma precursors, increasing the varietal expression, without affecting sugars, acids and pH.

DOI:

Publication date: September 1, 2021

Issue: Macrowine 2021

Type: Article

Authors

Duilio Porro , San Michele , Fabrizio, BATTISTA.

Fondazione Edmund Mach Via Mach 1 38098 San Michele all’Adige (TN) – Italy, Fabrizio, BATTISTA. Lallemand Inc, Via Rossini 14/B, 37060 Castel D’Azzano (VR) Italy

Contact the author

Keywords

elicitor, inactivated yeast, thiols, traminer, aroma precursors, terpenes, climate change

Citation

Replay of the Wine Vision 2040 event

A webinar organised by the UBC Wine Research Centre, on June 25th 2020. About Wine Vision 2040 Wine Vision 2040 is delivered by wine-passionate, high-profile individuals keen to share ideas and views that will spark conversations within wine communities. No...

Using atmospheric and statistical models to understand local climate and assess spatial temperature variability at a fine scale over the Stellenbosch wine district, South Africa

Atmospheric and statistical models were used to increase understanding of potential climatic impacts, resulting from mesoscale physical processes that cause significant temperature variability for viticulture within the Stellenbosch Wine of Origin district. Hourly temperature values from 16 automatic weather stations and 40 tinytag data loggers located in the vineyards were analysed.

Re-examination and meta-analysis of previous research as a tool to evaluate the suitability of rootstocks in adaptation to global change. A study case from Spanish viticulture

Meta-analysis (MA) is a method that allows statistical synthesis of the results of several similar individual studies (Figure 1). This term was introduced by Glass in 1976 as a useful tool for the scientific community to pool and summarise the enormous amount of information collected in the literature.

Influence du terroir sur la composition en flavonoïdes de la baie de raisin de Cabernet franc en Moyenne Vallée de la Loire

The terroir offers great variability in the typicity of the wines produced. Following tastings integrating several vintages, the multiple factor analysis of the sensory data revealed a group of taste criteria contributing to the notion of “Power”, referenced “Power and Harmony”, which makes it possible to differentiate wines from various terroirs of the Middle Loire Valley (Pages et al ., 1987).

Drought responses of grapevine cultivars under different environments

Using grapevine genetic diversity is one of the strategies to adapt viticulture to climate change. In this sense, assessing the plasticity of cultivars in their responses to environmental conditions is essential. For this purpose, the drought tolerance of Grenache, Tempranillo and Semillon cultivars grafted onto SO4 was evaluated at two experimental vineyards, one located in Valencia (Spain) and the other in Bordeaux (France). This was done by assessing gas exchange parameters, water relations and leaf hydraulic traits at the end of the season.