terclim by ICS banner
IVES 9 IVES Conference Series 9 Characterization of berry softening and sugar accumulation dynamics in a slow-ripening genotype and its response to abscisic acid treatments

Characterization of berry softening and sugar accumulation dynamics in a slow-ripening genotype and its response to abscisic acid treatments

Abstract

In the current viticultural context, global warming leads to advanced and possibly accelerated ripening which can alter the balance among desirable grape quality traits sought for winemaking. Evaluation of genetic material that displays delayed and/or slower ripening could uncover a potential “slow ripening” trait for incorporation into commercial varieties through breeding. In this study, we evaluated a white-fruited selection discovered in the Grape Breeding and Genetics program at E. & J. Gallo Winery that displayed an unusual ripening pattern compared to standard varieties. Vines of the slow-ripening selection did not differ in their visual appearance, water status or gas exchange characteristics compared to vines of its normal-ripening sibling. Sugar accumulation, berry growth and berry firmness were monitored weekly during ripening for two consecutive years to characterize differences in fruit maturation rate between the selections. Compared to the normal-ripening selection, the slow-ripening selection exhibited a 30-day delay in the onset of ripening and required longer to complete veraison, resulting in an extended lag phase. This was confirmed by berry firmness measurements, which revealed that berry softening was delayed and occurred at a reduced rate in the slow ripening selection. Exogenous abscisic acid treatments partially restored normal rates of ripening, but timing and dosage effects were observed. In this attempt to explore the slow ripening trait of grapes we discovered a possible imbalance in the hormone pool thought responsible for the onset of ripening. Further investigations are required to fully characterize and quantify this trait.

DOI:

Publication date: June 13, 2024

Issue: Open GPB 2024

Type: Article

Authors

Pietro Previtali1*, Kenneth Shackel2, Peter Cousins1, Nick Dokoozlian1

1 Winegrowing Research, E. & J. Gallo Winery, Modesto, 95354 CA
2 Department of Plant Sciences, University of California Davis, Davis, 95616 CA

Contact the author*

Keywords

berry softening, climate change, slow ripening, sugar accumulation, veraison

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

Application of GiESCO “bio-metaethics” charter in practice: the “direct” involvement of vine grower, winemaker, society

On the basis of a direct agreement between the GiESCO and the vine grower, the winemaker and the consumers (individual; company; public or private organizations), the communication on the content of the charter can be done as follows:
• Commitment to respect the basic rules of the GiESCO “BIO – MetaEthics” charter.
1/ Put Mankind in the depth of all concerns in a universal context: (grower, consumer, citizen, work valuing, education, security)
2/ Insure minimum impact on environment by optimizing cultivation technics: (maximum of natural biodegradable products, friendly practices, short channels, renewable energies, terroir sustainability)

Identification of green, aggressive and hard character of wines by a chemo-sensory directed methodology

With climate change, it is progressively more often to obtain grapes with an acceptable content in sugars or acids but with immature tannins described as green, aggressive or hard (noted as GAH onwards). During winemaking, the oenologist has to make decisions related to the elaboration of such grapes based mainly on empirical experience, given the lack of objective criteria to this concern. An increase in the chemical and sensory knowledge of immature tannins would allow managing this GAH character of grapes with the maximum possible efficiency during winemaking processes. The present work aims at isolating and identifying the group of compounds responsible for the GAH character present in wines.

Non-destructive his based analysis for shelf-life evaluation of table grape 

Fast, accurate, and non-destructive analytical techniques based on hyperspectral imaging (hsi) represent effective tools for food quality evaluation. A visible change in the appearance of a fresh product often negatively impacts the perceived quality from a consumer’s point of view.

The vine and the hazelnut as elements of characterization of a terroir

The research examines how two characteristic cultivations of a territory like the vine and the hazelnut shape the identity of a unique terroir: Langhe (North West italy).

Geopedological and climatic zoning of northern Malaga vineyards region: Fuente de Piedra, Humilladero and Mollina (southern Spain)

The vineyards placed in the municipal areas of Fuente de Piedra, Humilladero and Mollina constitute a wine-growing important area of the “Zona Norte” of the province of Málaga.