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…

Microbial ecosystems in wineries – molecular interactions between species and modelling of population dynamics

Microbial ecosystems are primary drivers of viticultural, oenological and other cellar-related processes
such as wastewater treatment. Metagenomic datasets have broadly mapped the vast microbial species
diversity of many of the relevant ecological niches within the broader wine environment, from vineyard
soils to plants and grapes to fermentation. The data highlight that species identities and diversity
significantly impact agronomic performance of vineyards as well as wine quality, but the complexity
of these systems and of microbial growth dynamics has defeated attempts to offer actionable
tools to guide or predict specific outcomes of ecosystem-based interventions.

Mouthfeel effects due to oligosaccharides within a wine matrix

The mouthfeel of wine is one of the most important aspects of the organoleptic experience of tasting wine. In wine a great deal is known about certain compositional components and how they impact mouthfeel perception, such as phenolics. But there are other components where little is understood, such as oligosaccharides. Saccharides in general are found in very low concentrations with wine, especially compared to conventional foods. There is very little information about how oligosaccharides influence the mouthfeel perception of wine.

Mechanistic insights into the bioavailability of oleocanthal and oleacein from olive oil in presence of wine active peptides and amino acids

Oleocanthal (OC) and oleacein (OL) are highly bioactive secoiridoids found in olive oil at elevated concentrations, especially when it is produced from unripe olives (Olea europaea L.). Both compounds have been correlated with strong activities against serious diseases through recent clinical trials. The most important clinical trials have been performed in patients against chronic lymphocytic

Heat requirements for grapevine varieties is essential information to adapt plant material in a changing climate

Precocity for fruit ripening is a genetically determined characteristic that is highly variable from one cultivar to another. In traditional wine-growing regions of Europe, growers have used this property to adapt the vines to local climatic conditions in order to maximize terroir expression

Vineyard microclimate alterations induced by black mulch through transcriptome reshaped the flavoromics of Cabernet Sauvignon

To alter the vineyard microclimate and produce quality wine under a semi-arid climate, black geotextile inter-row mulch (M) was applied for two vintages (2016-2017). The grapes were sampled at three growing stages to conduct the untargeted metabolome and transcriptome analysis. The upregulated genes related to photosynthesis and heat shock proteins confirmed that M weakened the total light exposure and grapes suffered severe heat stress, resulting in lower sugar and higher acids at harvest. The integration of metabolome and transcriptome analysis identified the key genes responsible for the enhancements in phenylalanine, glutamine, ornithine, arginine, and C6 alcohol concentrations, and the downward trend in ε-viniferin, anthocyanins, flavonols, terpenes and norisoprenoids concentrations in M grapes.