terclim by ICS banner
IVES 9 IVES Conference Series 9 Dormancy conundrum: thermal requirements plasticity to reach budburst may be explained by annual environmental dynamics

Dormancy conundrum: thermal requirements plasticity to reach budburst may be explained by annual environmental dynamics

Abstract

Deciphering grapevine dormancy is crucial in the current context of climatic challenges: advancing budburst phenology and increased late frost probabilities, observed in the last decades and expected to further increase, require deeper understanding. Beyond higher mean temperatures, abiotic stresses such as water deficit have also been emphasized as actors. In this framework, we aimed at exploring new methodologies for tracking dormancy cycle and testing the interplay on its regulation of temperature dynamics and drought.
In a first experiment, twenty-one Vitis vinifera varieties were monitored during ecodormancy and budburst over three years. The dataset, consisting of BBCH scale values, growing degree days (GDD) accumulation, and quantum yield of dark-adapted photosystem II (Fv/Fm) of bud sections, allowed us to identify non-linear associations of Fv/Fm ratio with early phenology and GDD6. Therefore, we propose it as a quantitative and reliable tool for further analyses.
In a second experiment, Chardonnay plants underwent water deficit stress or full-field capacity irrigation throughout the season. In addition to the methods described above, by sampling nodes at different timepoints during dormancy and exposing them to budbreak-forcing conditions, we tracked dormancy phases and their relationship with water deficit stress, acclimation and deacclimation dynamics.
Annual climate and dormancy cycle exhibit profound interdependence: oscillating temperature trends and stresses combinations lead grapevines to a plastic and varietal-specific response, possibly influenced by these same factors in several previous years.
The above findings and their underlying physiological mechanisms will be presented and discussed.

DOI:

Publication date: June 13, 2024

Issue: Open GPB 2024

Type: Poster

Authors

Alessandro Bignardi1*, Massimo Bertamini1, Michele Faralli1

1 Center Agriculture Food Environment (C3A), University of Trento, Via Mach 1, San Michele all’Adige, 38010 Trento, Italy

Contact the author*

Keywords

Grapevine, dormancy, late frost risk, drought, chlorophyll fluorescence

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

HOW TO EVALUATE THE QUALITY OF NATURAL WINES?

The movement of Natural wines has clearly increased in the last few years, to reach a high demand from consumers nowadays. Switzerland has not been left out of this movement and has created a dedicated association in 2021. This association has the ambition to develop a specific tasting sheet for natural wines. The study of the tasting notes shows that the olfactory description of wines is recent but predominant today. But wine is a product makes to be drunk and not (just) to smell it. Based on these findings, a new 100-point tasting sheet has been developed. The main characteristics are 1) an evaluation in the mouth before the description of the olfaction, 2) to give 50% of the points on the judgment for the mouth characteristics, 3) to pejorate the visual aspects only if the wine is judged as “not drinkable” and 4) to express personal emotions.

Phenological stage dependency of Cabernet Sauvignon and Grenache response to water and nutrient limitation 

As the frequency and intensity of drought events increase, understanding the mechanisms of plant resilience to water deficit is crucial. To maintain an appropriate plant yield, a common practice is the application of high amounts of fertilizers with negative environmental impacts. The single and combined effect of water deficit and nutrient availability, namely nitrogen (N) and potassium (K), in Vitis Vinifera L. cv. Cabernet Sauvignon and Grenache was evaluated. Two-year-old grapevine plants grafted on SO4 rootstock were transferred in pots under semi-environmental conditions. During the growing season, plants were either maintained well-watered (100% ETc) or subjected to a controlled water deficit irrigation (33% ETc).

The effect of wine matrix on the initial release of volatile compounds and their evolution in the headspace

There is evidence in the literature that non-volatile wine matrix can modify the release and therefore the perception of the compounds involved in wine aroma [1-3].

Green Vineyards: skills development for wine industry personnel: responding to the challenges of climate change

A fair and sustainable society, with a modern, resource-efficient and competitive economy cannot be achieved without a workforce to support it.

Quantification of polysaccharides of variety Pomaces of the D.O.Ca Rioja

Pomace is one of the main residues generated by the wine industry and represents an environmental problem. Currently, there is a growing interest in the revaluation of these products because different bioactive compounds can be obtained from them, such as polyphenols, grape seed oils and polysaccharides. Red grape pomace can be an important source of polysaccharides, but they are currently little studied and even less with viable and environmental extraction processes (green extraction), such as flash extraction. The residual amount of the fraction rich in pectin (residual pulp) and component rich in hemicellulose in the pomace and the strength of association of the pectin with the cellulose-xyloglucan network depend on the degree of extractability of the polysaccharides in red winemaking and on the winemaking conditions.