Macrowine 2021
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

Related articles…

Characteristics of ecological production of grape and wine in Prizren’s vineyard territory in Yugoslavia

Prizren’s vineyard territory-y assigned for ecological production of grapes and wine includes 1. 200 hectares of vineyard located in five separate localities which belongs to the P KB “Kosovo vina”, Mala Krusa in Prizren. Division of vineyard territory in zones was carried out in 1974. Pertaining to the vineyards, the climate and soil conditions have been studied and determined as well as topographie establishing of vineyard boundaries.

Read More

New Insights into Wine Color Analysis: A Comparison of Analytical Methods and their Correlation with Sensory Perception

wo spectrophotometric methods are recommended by the Organisation Internationale de la vigne et du vin (OIV). The first is the method after Glories, were the absorbances at 420 nm, 520 nm and 620 nm are measured (OIV 2006a).

Read More

A comprehensive study on the effect of foliar mineral treatments on grapevine microbiota, flavonoid gene expression, and berry composition

Recently, foliar treatments with mineral-based compounds have shown positive effects on grapevine production by protecting grape from thermal excesses and reducing the decoupling between technological and phenolic maturity caused by climate change. Unraveling the effect of mineral particle applications on grape-associated microbes is pivotal for successful wine processing, due to the influence of the microbiota on wine composition and stability. To our knowledge, this is the first work that comprehensively studied the effects of kaolin and chabasite-rich zeolitites treatments on grape-related microorganisms (by real-time PCR quantification of total fungi, Hanseniospora uvarum, Metschnikowia pulcherrima, plant-associated bacteria and lactic acid bacteria), the expression of genes related to the flavonoid biosynthesis (PAL1, CHS1, F3H2, DFR, LDOX, UFGT, MYBA1, GST4, FLS4 genes) and the berry composition (°Brix, pH, acidity and anthocyanin concentrations) in cv. Sangiovese during ripening in two growing seasons (2019 and 2020).

Read More

Preliminary studies of zoning applications in Goriška Brda (Collio) winegrowing region, Slovenia

Goriška Brda est la région viticole située le plus à l’ouest de la Slovénie, attenante au Collio d’Italie. Goriška Brda (2020 ha de vignobles) a une longue tradition d’élevage viticole. La proximité de la mer Adriatique (Golfe de Trieste) au sud-ouest et des Alpes Juliennes au nord contribue à un climat caractéristique et unique qui influe sur la croissance et la fertilité de la vigne. La constitution des sols, un climat typique et un relief mouvementé provoquent des différences dans la production du raisin, sa quantité et sa qualité. L’utilisation du zonage ou du microzonage permettraient d’atténuer les influences des facteurs climatiques et du sol sur la production de la vigne ou d’en profiter. Pour évaluer la signification des différents facteurs, nous avons résumé et réuni les modèles de différents auteurs.

Read More

Improvement of non-Saccharomyces yeast dominance during must fermentation by using spontaneous mutants resistant to SO2, EtOH and high pressure of CO2

AIM: A genetic study of four wine T. delbrueckii strains was done. Spore clones free of possible recessive growth‐retarding alleles with enhanced resistance to winemaking stressing conditions were obtained from these yeasts. METHODS: The genetic marker of resistance to cycloheximide (cyhR) allows easy monitoring of the new mutants obtained from these yeasts.

Read More