Terroir 2020 banner
IVES 9 IVES Conference Series 9 Water and physiological response to early leaf removal of cv. Verdejo in rainfed conditions, at different times of the day, in the D.O. Rueda (Spain)

Water and physiological response to early leaf removal of cv. Verdejo in rainfed conditions, at different times of the day, in the D.O. Rueda (Spain)

Abstract

Aim: Early leaf removal, generally applied before flowering, is mostly conceived as a technique to control grape yield and improve the health of grapes and focused on the final objective of increasing wine quality.

New knowledge of its possible physiological effects in the cv. Verdejo, in rainfed conditions, should facilitate the understanding of agronomic, vegetative and qualitative behaviour of the vineyard, thus generating more possibilities of adaptation to optimize the grape ripening process.

Methods and Results: Leaf removal was carried out by removing the first eight adult leaves, from the base, on all shoots. The trial was carried out with cv. Verdejo, grafted onto 110R, planted in 2006 and trained on a vertical trellis, in rainfed conditions, in the D.O. Rueda.Throughout the period of 2016-2018, the physiological response of the vines to early leaf removal (before flowering) was studied through measurements of water potential at 7, 9, 11 and 12 hours (solar time) and stomatal conductance, transpiration and net photosynthesis at 9 and 12 hs.

The water potential measured at different times of the day showed no differences between treatments. The values were slightly higher in the control vines sometimes and higher in the leaf plucked vines other times, but more frequently favourable to the control vines in 2017 and 2018, especially in the measurements at 9 and 11 hs. Gas exchange (Gs, E, An) also did not show statistically significant differences between treatments. Some values were slightly favourable to the leaf removal treatment, such as at 9 hs in 2016, and other values were slightly favourable to the control treatment, such as at 12 hs in 2017 and at 9 hs in 2018.

Conclusions:

The results observed in the water potential and in the gas exchange at different times of the day have not generally discriminated between the leaf removal applied at the beginning of flowering and the control treatments.

Significance and Impact of the Study: The agronomic benefit intended with the early leaf removal, generally to lighten the compactness and weight of the bunch, as well as its aeration and luminosity, does not have to be questioned from the water or physiological point of view in the cv. Verdejo on rainfed conditions.

DOI:

Publication date: March 25, 2021

Issue: Terroir 2020

Type : Video

Authors

Jesus Yuste* and Daniel Martinez-Porro

Instituto Tecnologico Agrario de Castilla y Leon, Ctra. Burgos km 119, 47071 Valladolid, Spain

Contact the author

Keywords

Grapevine, photosynthesis, stomatal conductance, transpiration, water potential

Tags

IVES Conference Series | Terroir 2020

Citation

Related articles…

A global and regional study on winegrowers’ perceptions and adaptations to climate change

Aim: The aim of this study was to explore the current and future state of the wine sector in the context of climate change, where the goal was to obtain greater understanding on winegrowers’ perceptions and adaptations to a changing climate and its associated impacts. The study sought to provide both a global and regional perspective on these issues.

Current climate change in the Oplenac wine-growing district (Serbia)

Serbian autochthonous vine varieties Smederevka (for white wines) and Prokupac (for rosé and red wines) are the primary representatives of typical characteristics of wines and terroir of numerous wine-growing areas in Serbia. In the past, these varieties were the leading vine varieties, however, as the result of globalization of winemaking and the trend of consumption of wines from widely prevalent vine varieties, they were replaced by introduced international varieties. Smederevka and Prokupac vine varieties are characterized by later time of grape ripening, and relative sensitivity to low temperatures. Climate conditions can be a restrictive factor for production of high-quality grapes and wine and for the spatial spreading of these varieties in hilly continental wine-growing areas.
This paper focuses on the spatial analysis of changes of main climate parameters, in particular, analysis of viticultural bioclimatic indices that were determined for the purposes of viticulture zoning of wine-growing areas in the period 1961-2010, and those same parameters determined for the current, that is, referential climate period (1988-2017). Results of the research, that is, analysis of climate changes indicate that the majority of examined climate parameters in the Oplenac wine-growing district improved from the perspective of Smederevka and Prokupac vine varieties. These studies of climate conditions indicate that changes of analyzed climate parameters, that is, bioclimatic indices will be favorable for cultivation of varieties with later grape ripening times and those more sensitive to low temperatures, such as the autochthonous vine varieties Smederevka and Prokupac, therefore, it is recommended to producers to more actively plant vineyards with these varieties in the territory of the Oplenac wine-growing district.

The influence of initial phenolic content on the outcome of pinot noir wine microoxygenation

Over the years, microoxygenation (MOX) has become a popular vinification technique to improve wine sensory qualities. However, among the impacting factors reported

Influenza del sito di coltivazione nella espressione aromatica del Moscato liquoroso di Pantelleria

ln 1997, twenty six cultivation sites of cv. Muscat of Alexandria different for pedological conditions, altitude and exposition were selected through ail Pantelleria isle. ln each site, described and classified according to USDA Soil Taxonony and FAO Soil Classification methods, grapes, collected at technological ripening, were microvinificated, following a standard procedure which allowed to obtain the naturally sweet wine DOC Moscato di Pantelleria. Wines, five months after vinification, were analysed by gaschromatography.

Ripening of cv. Cabernet Sauvignon grapes: polysaccharides fractions evolution and phenolic extractability

Polysaccharides and more specifically pectins, make up a significant portion of the cell wall material of the plant cells including the grapes. During the fruit ripening the associated softening is related to the breakdown of the cell wall polysaccharides. During this process, it is expected that polysaccharides that are soluble in red wine will be formed influencing its texture. Anthocyanins are responsible for the wine color and tannins for the astringency, body and bitterness of the wine. In the skins, these compounds are located in the cell vacuoles and the barrier that conditions their extractability is the skin cell wall that may determine the mechanical resistance, the texture and the ease of processing berries. The aim of this work was study the evolution of the polysaccharides and the anthocyanin and tannin extractability during the ripening period in Cabernet Sauvignon grapes, trying to correlate these variables.