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…

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.

Vineyard yield estimation using image analysis: assessing bunch occlusions and its dependency on fruiting zone canopy features

Performing accurate vineyard yield estimation is of upmost importance as it provides important benefits to the whole vine and wine industry. Recently, image-analysis approaches have been explored to address this issue however this approach has as main challenge the bunch occlusion, mostly by vegetation but also by neighboring bunches. The present work aims at assessing the magnitude of bunch occlusion by neighboring bunches and to evaluate its dependency on a selection of vegetative and reproductive vine parameters assessed at fruiting zone. Forty vine segments (1 m) of two vineyard plots of the white cultivars ‘Alvarinho’ and ‘Arinto’ were assessed for vegetative and reproductive features at fruiting zone and imaged with a 2D camera.

Defoliation combined with exogenous ABA application results in slower ripening and improved anthocyanin profile

Reducing sugar accumulation in grape (Vitis vinifera L.) berries may be a way to mitigate the effect of climate change. Managing canopy and crop load is an effective way to do so, however, reducing canopy size has been demonstrated to induce undesirable effects on anthocyanins. The aim of this study was to test if an application of exogenous ABA on the grape berries of defoliated vines (⅔ of the leaves removed) can result in slower sugar accumulation while maintaining grape and wine quality. An experiment with defoliation and exogenous ABA application on directly on clusters (factorial design 2×2) was performed with ‘Tempranillo’ fruit-bearing cuttings.

Response of red grape varieties irrigated during the summer to water availability at the end of winter in four Spanish wine-growing regions: berry phenolic composition

Water availability is the most limiting factor for vineyard productivity under Mediterranean conditions. Due to the effects caused by the current climate change, wine-growing regions may face serious soil moisture conservation problems, due to the lower water retention capacity of the soil and higher soil irradiation. The aim of this work was to evaluate the effects of soil recharge irrigation in pre-sprouting and summer irrigation every week (30 % ETo) from the pea size state until the end of ripening (RP) compared to exclusively summer irrigation every week (R) in the same way that RP, on berry phenolic composition at harvest.

Effect on the grape and wine characteristics of cv. Tempranillo at 3 production levels

The vineyard has experienced a general increase in yields mainly due to the elevated use of technology which caused a quality loss of grapes in more than one case. A large percentage of the Spanish vineyard is covered by a Denomination of Origin which limits the productive level of the vineyards as one of its regulations. The maximum production limit is a variable characteristic of each vineyard and is not usually regulated by agronomic criteria, and this explains the fact that each vineyard can reach high quality with a totally different yield from that set by the Denomination of Origin.