terclim by ICS banner
IVES 9 IVES Conference Series 9 International Congress on Grapevine and Wine Sciences 9 2ICGWS-2023 9 Late winter pruning induces a maturity delay under temperature-increased conditions in cv. Merlot from Chile

Late winter pruning induces a maturity delay under temperature-increased conditions in cv. Merlot from Chile

Abstract

Chile is considered vulnerable to climate change; and these phenomena affect several mechanisms in the grape physiology and quality. The global temperature increase affects sugar contents, organic acids, and phenolic compounds in grapes, producing an imbalance maturity. In this sense, an alternative to reduce the impact is to perform pruning after vine budburst, known as “Late Pruning” (LP).

The study aims are evaluating the LP, under ambient (Control) and temperature increase (T+) conditions, as agronomical technique that allows the imbalance of sugar and anthocyanins and delaying grapes maturation in cv. Merlot (Valle central, Chile) during two seasons. To achieve this goal tree pruning were made: winter pruning (WP); LP1 (Late pruning at budbreak) and LP2 (at shoots of 2-4 cm). The phenology of the crop was monitored and gas exchange, chlorophyll fluorescence and photosynthetic pigments were determined at key growth stages. At harvest (22±1 ºBrix), anthocyanins and total soluble solids were determined to evaluate the development of maturation.

During two seasons (21-22; 22-23) temperatures produced an earlier harvest in WP. LP1 treatments under control conditions had no effect on harvest date, and LP2 even advanced it. Under T+ conditions, LP1 had the most positive effects, delaying harvest by 5 to 22 days (season depending) and increasing total anthocyanin by 12% under ambient conditions and by 19% at T+. Regarding the effects on gas exchange, temperature significantly reduced photosynthesis in both seasons, but LP had no effect. In conclusion, the delay of sugar accumulation due to LP at budbreak could have a positive effect on anthocyanin concentration, without affecting other parameters such as photosynthesis.

Acknowledgements: This study is part of the project Fondecyt 11200703 (ANID). Thanks to Manuel Gutierrez for his field work and Jose Macias, graduate student.

DOI:

Publication date: October 25, 2023

Issue: ICGWS 2023

Type: Article

Authors

C. Salazar-Parra1*, R. Rivera1,2, M. Miranda1, M. Reyes3, C. Peppi1

1Instituto de investigaciones agropecuarias, INIA La Platina.
2Undergraduate student. Facultad de Ciencias. Universidad de Chile.
3Instituto de investigaciones agropecuarias. INIA Raihuen.

Contact the author*

Keywords

temperature, anthocyanins, grapevine, climate change, sugars

Tags

2ICGWS | ICGWS | ICGWS 2023 | IVES Conference Series

Citation

Related articles…

Viticultural heritage in mountain territories of Catalonia: prospecting in the region of Osona, northern Spain

The recovery of ancestral or minority vine varieties has been gaining great interest in recent years, among other reasons because it is likely that some of these varieties, due to the fact that they are found in relict areas, have a greater potential for adaptation to external factors (biotic or abiotic) and can minimize the effects that climate change is causing in viticulture. Varieties that can be grown at altitude are currently being sought to combat rising temperatures and prolonged extreme drought conditions. In Catalonia, the Pyrenean expansion of vineyard cultivation is documented from the 10th century and has been related to the “small climatic optimum” (9th-12th centuries) and also to seigniorial power.[1] But different adverse climatic periods and the arrival of Phylloxera by the late 19th century made many of these crops disappear.[2]

Water and nutritional savings shape non-structural carbohydrates in grapevine (Vitis vinifera L.) cuttings

Global changes and sustainability challenge researchers in saving water and nutrients. The response of woody crops, which can be forced at facing more drought events during their life, is particularly important. Vitis vinifera can be an important model for its relevance in countries subjected to climate changes and its breeding, requiring cuttings plantation and strong pruning.

The colour pattern of flower arrangements influence wine tasters’ sensory description

The arrangements of flowers and wine counterparts are inextricably linked. Whether a fundamental aspect of tablescaping or acolytes to broader entertainment rituals, they have an entangled history since ancient times. The aim of this contribution is to verify the influence of visually delicate and robust flower arrangements on individual description of wines. Changes in the sensory description of wines were investigated during subjects’ (thirty-two participants) exposure to three different conditions: the presence of delicate, robust, or totally absent flower arrangements.

Influence of p-Coumaric Acid and Micronutrients on Growth and 4-Ethylphenol Production by Brettanomyces bruxellensis

The wine spoilage caused by Brettanomyces bruxellensis is one of the global concerns for winemakers. Detecting the presence of B. bruxellensis using routine laboratory culture techniques becomes challenging when cells enter the viable but not culturable (VBNC) state. This study aims to investigate the impact of p-coumaric acid (a volatile phenol precursor) and micronutrients on B. bruxellensis’ culturability, viability, and volatile phenol production under sulfite stress. In red wine, exposure to a high sulfite dose (100.00 mg L-1 potassium metabisulfite) resulted in immediate cell death, followed by a recovery of culturability after two weeks.

Effects of different soil types and soil management on greenhouse gas emissions 

Soil is important in the carbon cycle and the dynamics of greenhouse gases (CO2, CH4 and N2O). Key soil characteristics, such as organic matter content, texture, structure, pH and microbial activity, play a determining role in GHG emissions[1]. The objective of the study is to delimit different types of soil, with different soil management and to be able to verify the differences in CO2, CH4 and N2O emissions. The study was carried out in a vineyard of Bodegas Campo Viejo in Logroño (La Rioja), whose plant material is Vitis vinifera L. cv. Tempranillo.