Terroir 2008 banner
IVES 9 IVES Conference Series 9 Influence of organic plant treatment on the terroir of microorganisms

Influence of organic plant treatment on the terroir of microorganisms

Abstract

Several factors like vineyard site, climate, grape variety, ripeness, physical health of the grapes and pest management influence the populations of indigenous yeasts on grapes and later on in spontaneous fermentations. During spontaneous fermentations, so called “wild yeasts” could significantly influence the wine aroma. Some authors certify more complexity and an increase of wine quality to these fermentations. A widespread opinion is that spontaneous fermentation can help to emphasize the characteristics of a specific geographical area or even of one vineyard site.
This was checked in a three years experimental period testing different pest management strategies to replace or reduce copper and sulphur and comparing integrated, organic and biodynamic strategies. Alternatives to copper or sulphur treatments could however have an impact on the aroma profiles, as they alter the composition of natural yeast populations in the vineyard or lead to changes in yeast metabolism. This was tested with several alternative strategies compared to organic-standard and integrated variants. Effects on spontaneous flora, fermentation course and aroma profiles were analysed.
Yeast populations on grapes and at different stages of grape and must processing were isolated and determined using RFLP analysis of the ITS-region.
Hanseniaspora uvarum and Metschnikowia pulcherrima were the dominating species on the grapes in all variants. There was no correlation between the population dynamics of yeast during the processing and fermentation and the different pest management strategies.
In this survey the processing and the ecosystem winery seem to have a more important influence on yeast diversity than the microflora composition on grapes.

Download the PDF

DOI:

Publication date: December 8, 2021

Issue: Terroir 2008

Type : Article

Authors

STÖLBEN T (1,2), RÜCK C (1,2), HERRBRUCK T (1,2), KAUER R (1), VON WALLBRUNN C (2)

(1) Fachbereich Geisenheim, Fachhochschule Wiesbaden, Von-Lade-Str. 1, 65366 Geisenheim
(2) Fachgebiet Mikrobiologie u. Biochemie, Forschungsanstalt Geisenheim, Von-Lade-Str. 1, 65366 Geisenheim

Contact the author

Keywords

 yeast, spontaneous fermentation, organic pest management, RFLP, sensory analysis

Tags

IVES Conference Series | Terroir 2008

Citation

Related articles…

Application of remote sensing by unmanned aerial vehicles to map variability in Ontario Riesling and Cabernet Franc vineyards

The objective of this investigation was to verify usefulness of proximal sensing technology and unmanned aerial vehicles (UAVs) for mapping variables e.g., vine size (potential vigor), soil and vine water status, yield, fruit composition, and virus incidence in vineyards.

Read More

Time stability of visitors’ preferences for preserving the worldwide cultural landscape alto douro wine region

The Alto Douro Wine Region (ADWR) was classified a world heritage site, specifically as a cultural landscape, by UNESCO, in 2001. The well known “Porto Wine” and other high quality wines are produced in the Douro region. As an attraction and touristic site, the cultural site has to meet the needs of more demanding visitors and to compete with a growing number of cultural sites, also classified by UNESCO. To achieve this goal, landscape managers and public authorities have much to profit from knowing and understanding visitors’ preferences regarding the attributes associated to its outstanding universal value.

Read More

Intra-vineyard spatial variability explored over multiple seasons by sensor-based techniques in the Valpolicella area

The identification and management of intra-vineyard variability are key to precision viticulture, and sensors have been proven to be highly efficient tools for detecting these variations.

Read More

Mapping of canopy features in commercial vineyards using machine vision

Vineyard canopy features such canopy porosity and fruit exposure influenced microclimate, fungal disease incidence and grape composition. An objective, rapid and non-invasive method to assess and map the canopy status is needed to apply in precision viticulture. A new method for canopy status assessment and mapping based on non-invasive machine vision was applied in commercial vineyards in this work.

Read More

Optimizing protocol for a rapid and cost effective DNA isolation for Marker Assisted Selection pipeline

Grapevine is a plant that holds significant socioeconomic importance due to its production of grapes for fresh consumption, wines, and juices. However, climate changes and susceptibility to diseases pose a threat to the quality and yield of these products. The breeding of new genotypes that are resistant/tolerant to biotic and abiotic stresses is essential to overcome the impact of climate changes. In this regard, Marker-assisted selection (MAS), which uses DNA markers, is a crucial tool in breeding programs. The efficiency and economy of this method depend on finding rapid DNA isolation methods.

Read More