terclim by ICS banner
IVES 9 IVES Conference Series 9 IMPACT OF NEW BIO STIMULANTS ON GRAPE SECONDARY METABOLITES UNDER CLIMATE CHANGE CONDITIONS

IMPACT OF NEW BIO STIMULANTS ON GRAPE SECONDARY METABOLITES UNDER CLIMATE CHANGE CONDITIONS

Abstract

In a context of climate change and excessive use of agrochemical products, sustainable approaches for environmental and human health such as the use of bio stimulants in viticulture represent a potential option, against abiotic and biotic threats. Bio stimulants are organic compounds, microbes, or a combination of both, that stimulate plant’s vital processes, allowing high yields and good quality products. In vines, may trigger an innate immune response leading to the synthesis of secondary metabolites, key compounds for the organoleptic properties of grapes and wines. During this research the prospect of foliar application of bio stimulants to improve the aromatic and polyphenolic potential of the grapes was investigated in two consecutive years, characterized by hot and dry summers. Two different products, prepared with specific fractions of inactivated yeasts, were compared, and applied in different points during veraison with two- or three-time application protocol. The experiment involved two cultivars cultivated in Tuscany, a white (Vermentino) and a red one (Sangiovese). Quali-quantitative determination of the aromatic composition of the grapes was carried out using GC-MS, whereas polyphenols in skins and seeds were analyzed by spectrophotometry and HPLC methods. The bio stimulants did not affect the vine yield, but higher berry weight and reduced sugar contents were noted at harvest in the grapes from treated with respect to the control vines. All treatments enhanced polyphenolic potential in berry skins of red grapes, whereas modifications on anthocyanins percentages and reduction of flavonols were also observed, suggesting a protective effect of the treatments against solar radiation stress. Moreover, grapes from treated vines differ significantly for the lower content of polyphenolic compounds in their seeds. As regards aroma precursors, three-time application triggered significantly higher contents for almost all chemical classes of aromatic precursors for Vermentino whereas all treatments enhanced the accumulation of terpenoids and benzenoids in the berries of San-giovese. Bio stimulants thus, improved the qualitative parameters of the grapes, but their effect was different based on the frequency and the timing of the application, the chemical class of the compounds and the cultivar examined. Further future investigation is necessary to optimize bio stimulant application to contrast stress conditions and improve grape quality.

 

1. Du Jardin, P. Plant biostimulants: Definition, concept, main categories and regulation. Sci. Hortic. 2015, 196, 3–14.
2. Cataldo, E.; Fucile, M.; Mattii, G.B. Biostimulants in Viticulture: A Sustainable Approach against Biotic and Abiotic Stresses. Plants 2022, 11, 162. https://doi.org/10.3390/plants11020162
3. Asproudi, A., Petrozziello, M., Cavalletto, S., & Guidoni, S. (2016). Grape aroma precursors in cv. Nebbiolo as affected by vine microclimate. Food chemistry, 211, 947-956. https://doi.org/10.1016/j.foodchem.2016.05.070
4. Asproudi, A., Ferrandino, A., Bonello, F., Vaudano, E., Pollon, M., & Petrozziello, M. (2018). Key norisoprenoid compounds in wines from early-harvested grapes in view of climate change. Food chemistry, 268, 143-152. https://doi.org/10.1016/j.foodchem.2018.06.069
5. D’Arcangelo, M.E.M.; Valentini, P.; Puccioni, S.; (2018). Evaluation of new products against grapevine Downy mildew. Atti Giornate Fitopatologiche, 2018, 2, 503-512.

DOI:

Publication date: February 9, 2024

Issue: OENO Macrowine 2023

Type: Poster

Authors

Andriani Asproudi¹, Maurizio Petrozziello¹, Vasiliki Ragkousi¹, Mauro Eugenio Maria D’Arcangelo², Sergio Puccioni², Federica Bonello¹

1. CREA-VE: Council for Agricultural Research and Economics- Research centre for Viticulture and Enology
2. Via P. Micca 35, 14100 Asti, Italy
3. 2.CREA-VE: Council for Agricultural Research and Economics- Research centre for Viticulture and Enology
4. Viale Santa Margherita, 80 – 52100 Arezzo, Italy

Contact the author*

Keywords

aroma precursors, polyphenols, Vermentino, Sangiovese

Tags

IVES Conference Series | OENO Macrowine | oeno macrowine 2023

Citation

Related articles…

INFLUENCE OF THE NITROGEN / LIPIDS RATIO OF MUSTS ON THE REVELATION OF AROMATIC COMPOUNDS IN SAUVIGNON BLANC WINE

Production of volatile compounds by yeast is known to be modulated by must nitrogen. Nevertheless, various parameter of must quality have an impact on yeast fermentation. In this study we propose to evaluate the impact of nitrogen / lipids balance on a Sauvignon Blanc grape juice (Val de Loire).
Must was prepared from the same grapes at pilot scale. Three modalities were carried out: direct pressing, direct pressing with a pre-fermentation cold stabulation and pellicular maceration before pressing.

Read More

CONTRIBUTION OF VOLATILE THIOLS TO THE AROMA OF RIESLING WINES FROM THREE REGIONS IN GERMANY AND FRANCE (RHEINGAU, MOSEL, AND ALSACE)

Riesling wines are appreciated for their diverse aromas, ranging from the fruity fresh characters in young vintages to the fragrant empyreumatic notes developed with aging. Wine tasters often refer to Riesling wines as prime examples showcasing terroir, with their typical aroma profiles reflecting the geographical provenance of the wine. However, the molecular basis of the distinctive aromas of these varietal wines from major Riesling producing regions in Europe have not been fully elucidated. In this study, new lights were shed on the chemical characterization and the sensory contribution of volatile thiols to Riesling wines from Rheingau, Mosel, and Alsace. First, Riesling wines (n = 46) from the three regions were collected and assessed for their aroma typicality by an expert panel.

Read More

HYDROXYTYROSOL PRODUCTION BY DIFFERENT YEAST STRAINS: SACCHAROMYCES AND NON-SACCHAROMYCES AND THE RELATION WITH THE NITROGEN CONSUMPTION

Hydroxytyrosol (HT) is a phenolic compound with extensive bioactive properties. It is present in olives, olive oil and wines. Its occurrence in wines is partly due to yeast synthetise tyrosol from tyrosine by the Ehrlich pathway, which is subsequently hydroxylated to .
The aim of the present work is to study how different yeast strains can influence in the HT production and, how the different nitrogen consumption of each strain can interfere the production of bioactive compounds.

Read More

NEW TREATMENTS FOR TEMPRANILLO WINES BY USING CABERNET SAUVIGNON VINE-SHOOTS AND MICRO-OXYGENATION

Toasted vine-shoots as enological additive represents a promising topic due to their significant effect on wine profile. However, the use of this new enological tool with SEGs varieties different than wine and combined with others winemaking technologies, such as micro-oxygenation (MOX), has not been studied so far, despite this combination could result in wine with high chemical and organoleptic quality.

Read More

INFLUENCES OF SO2 ADDITION AND STORAGE CONDITIONS IN THE DETERMINATION OF MEAN DEGREE OF POLYMERIZATION OF PROANTHOCYANIDINS IN AGED RED WINES

The structural diversity is one of the most remarkable characteristics of proanthocyanidins (PA). Indeed, PA in wines may vary in the B-ring and C-ring substitutes, the C-ring stereochemistry, the degree of polymerization (DP) and the linkage between the monomers. Knowing in detail the structural characteristics of the PA of a wine can help us to understand and modulate several sensorial characteristics of the wine, such as color, antioxidant properties, flavor, and mouthfeel properties. In the last years was discovered and confirmed the presence of sulfonated monomeric and oligomeric flavan-3-ols in wine [1], as well as was pointed out their importance in wine quality [1,2].

Read More