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…

Effect of riboflavin on the longevity of white and rosé wines

Light is a fundamental part at sales points which influences in the conservation of wines, particularly in those that are sold in transparent glass bottles such as rosé wines and increasingly white wines. The photochemical effect known as “light-struck taste” can cause changes in the aromatic characteristics of the wine. This “light-struck taste” is due to reactions triggered by the photochemical sensitivity of riboflavin (RBF).

Read More

Effect of two water deficit regimes on the agronomic response of 12 grapevine varieties cultivated in a semi-arid climate

The Mediterranean basin is one of the most vulnerable regions to Climate Change effects. According to unanimous forecasts, the vineyards of Castilla-La Mancha will be among the most adversely affected by rising temperatures and water scarcity during the vine’s vegetative period. One potential strategy to mitigate the negative impacts of these changes involves the identification of grapevine varieties with superior water use efficiency, while ensuring satisfactory yields and grape quality.

Read More

Preliminary results of water status and metabolite content of three new crossbreed winegrape genotypes

This study presents the preliminary results obtained in 2022, of the evaluation of three new crossbreed winegrape genotypes and their parental varieties, grown under controlled irrigation (60% ETc) and rainfed conditions in a wine-growing area with scarcity of water and high temperatures (Murcia, southeast Spain). The genotypes MC16 and MC80 were obtained from crosses between the varieties ‘Monastrell’ and ‘Cabernet Sauvignon’, and MS104 from crosses between ‘Monastrell’ and ‘Syrah’ [1]. The objective of this study was to analyse the physiological response and vegetative development of the 6 genotypes under the two irrigation conditions, and to study their effect on the content of soluble sugars and chlorophyll in the leaf.

Read More

Optimization of the acquisition of NIR spectrum in grape must and wine 

The characterization of chemical compounds related with quality of grape must and wine is relevant for the viticulture and enology fields. Analytical methods used for these analyses require expensive instrumentation as well as a long sample preparation processes and the use of chemical solvents. On the other hand, near-infrared (NIR) spectroscopy technique is a simple, fast and non-destructive method for the detection of chemical composition showing a fingerprint of the sample. It has been reported the potential of NIR spectroscopy to measure some enological parameters such as alcohol content, pH, organic acids, glycerol, reducing sugars and phenolic compounds.

Read More

Uncovering the interplay between Copper and SO2 tolerance in Saccharomyces cerevisiae

[lwp_divi_breadcrumbs home_text="IVES" use_before_icon="on" before_icon="||divi||400" module_id="publication-ariane" _builder_version="4.20.4" _module_preset="default" module_text_align="center" module_font_size="16px" text_orientation="center"...
Read More