 IVES 9 IVES Conference Series 9 Macrowine 9 Macrowine 2021 9 Grapevine diversity and viticultural practices for sustainable grape growing 9 Preliminary evaluation of agronomic and enological properties of preselected grapevine clones of ‘Tempranillo’ and ‘Graciano’ in DOCa Rioja (Spain)

Preliminary evaluation of agronomic and enological properties of preselected grapevine clones of ‘Tempranillo’ and ‘Graciano’ in DOCa Rioja (Spain)

Abstract

AIM. Cultivation of a few number of clones is causing the loss of vineyard biodiversity, resulting in the disappearance of biotypes that could be of interest to face future challenges, such as climate change or appearance of new pests. This topic is so relevant that OIV dedicated a recent resolution (OIV, 2019) to the recovery and conservation of intra-varietal diversity. In order to avoid the loss of grapevine intra-varietal diversity of DOCa Rioja grape varieties, Regional Government of La Rioja established a germplasm bank with more than 1.600 accessions, which origin lies in the prospecting and sampling of ancient vineyards located throughout the whole region. 30 clones of Tempranillo and 13 clones of Graciano were preselected and multiplied in a new vineyard for further observations. The aim of this work is to describe the first results obtained from the agronomic characterization of these preselected clones, which constitute the base of a new clonal selection that aims to increase the range of available certified clones.

METHODS. Candidate clones (30 cv. Tempranillo; 13 cv. Graciano) were planted in 2016 in an experimental vineyard in La Rioja (Spain). A complete randomized block design was set up with four replicates of 10 plants. In 2020, clones were evaluated according to their phenological data (time of bud burst, full bloom, veraison and physiological ripeness). At harvest, yield parameters were determined: weight of 100 berries (g), cluster weight (g), fertility (clusters/shoot), yield (kg/plant) and cluster compactness (OIV descriptor Nº204). Must chemical composition was determined by analyzing ºBrix, pH, total acidity (g/l), tartaric acid (g/l), malic acid (g/l) and potassium (mg/l). The following vegetative growth parameters were determined: average shoot weight (g), pruning fresh weight (kg/plant) and Ravaz Index. In addition, clones were vinified and wine physical-chemical parameters, total phenolic index (TPI), anthocyanin content (mg/l) and color intensity were determined.

RESULTS. Significant differences between clones were found for each parameter. Results confirmed therefore the huge wide genetic variability existing between the clones regarding their agronomic behaviour. Moreover, clones also showed great differences regarding wine composition. Nonetheless, data collection needs to continue for at least 3 vintages in order to fulfill their caracterization independently from climatic conditions.

CONCLUSIONS

Clones have shown big differences in many of the parameters analyzed. The diversity found is a potential tool for the selection of those candidates with the best properties and constitutes the best guarantee of adaptation of these varieties to future objectives and environmental conditions.

DOI:

Publication date: September 1, 2021

Issue: Macrowine 2021

Type: Article

Authors

Javier Portu , Gobierno de La Rioja, Finca La Grajera, Elisa BAROJA, Juana MARTÍNEZ. Luis RIVACOBA. Enrique GARCÍA-ESCUDERO,

Instituto de Ciencias de la Vid y del Vino (Gobierno de La Rioja, Universidad de La Rioja, CSIC). Ctra. de Burgos Km. 6, Logroño, La Rioja 26007, Spain,

Contact the author

Keywords

intra-varietal diversity, climate change, clonal selection, genetic erosion

Citation

Soil management with cover crops in irrigated vineyards: effects in vine microclimate (cv. Malbec) grown in a terroir of Agrelo (Luján de Cuyo)

L’objectif de cette recherche a été de déterminer les effets de l’enherbement dans le microclimat de la vigne. On a comparé cinq couvertures de cycle végétatif différent en ce qui concerne l’entretien du sol sans culture par application d’herbicides. L’étude a été developpée dans un vignoble cv. Malbec conduit en haute espalier, situé en a terroir á Agrelo, Luján de Cuyo, Mendoza, Argentine. On a déterminé des paramètres micro climatiques:

Control of grapevine virus diseases in collections and at the stages of propagation in Ukraine

The principles of virological control on different types of grapevine collections and plantations are summarized.

A new AI-based system for early and accurate vineyard yield forecasting

Vineyard yield forecasting is a key issue for vintage scheduling and optimization of winemaking operations. High errors in yield forecasting can be found in the wine industry, mainly due to the high spatial variability in vineyards, strong dependency on historical yield data, insufficient use of agroclimatic data and inadequate sampling methods

Analysis of volatile composition of interaction between the pathogen E. necator and two grapevine varieties

Volatile organic compounds (VOCs) are emitted by nearly all plant organs of the plants, including leaves. They play a key role in the communication with other organisms, therefore they are involved in plant defence against phytopathogens. In this study VOCs from grapevine leaves of two varieties of Vitis vinifera infected by Erysiphe necator were analysed. The varieties were selected based on their susceptibility to pathogen, Kishmish Vatkana has the Ren1 resistance gene and Zamarrica showed high susceptibility in previous trials.

Molecular approaches for understanding and modulating wine taste

Wine consumers generally demand wines having a perception of softer tannins and less ripe, having a heaviness and richness on palate (full-body wine) with a limpid and stable color. However, polyphenol
(tannins)-rich wines have been also correlated with unpleasant taste properties such as astringency and
bitterness when perceived at high intensities. Modulating these unpleasant properties could be important for consumer’s approval of wines.