terclim by ICS banner
IVES 9 IVES Conference Series 9 Exploring grapevine water relations in the context of fruit growth at pre- and post-veraison

Exploring grapevine water relations in the context of fruit growth at pre- and post-veraison

Abstract

Climate change is increasing the frequency of water deficit in many grape-growing regions. Grapevine varieties differ in their stomatal behavior during water deficit, and their ability to regulate water potential under dry soil conditions is commonly differentiated using the concept of isohydricity. It remains unclear whether stomatal behavior, water potential regulation, and the resulting degree of isohydricity has a relationship with changes to fruit growth during water deficit. This study was conducted on four varieties (`Cabernet Franc`, `Semillon`, `Grenache`, and `Riesling`) subjected to both short-term, severe water deficit and long-term, moderate water deficit applied at both pre- and post-veraison. Stomatal conductance was measured with a porometer, pre-dawn and mid-day stem water potentials with a Scholander-type pressure chamber, and fruit growth with a caliper. `Cabernet Franc` and `Riesling` exhibited a greater ability to maintain stomatal conductance, pre-dawn water potential, and mid-day water potential as compared to `Semillon` and `Grenache`. `Cabernet Franc` and `Riesling` were also more resistant to changes in fruit growth than `Semillon` and `Grenache` during both short- and long-term water deficit. Water deficit applied at pre-veraison had a larger impact on fruit growth than when applied at post-veraison. While we were not able to distinctly classify varieties based on common metrics of isohydricity, we found an association between the ability of varieties to maintain stomatal conductance and their ability to maintain fruit growth during water deficit.

DOI:

Publication date: June 13, 2024

Issue: Open GPB 2024

Type: Poster

Authors

Nikolas Wilson1,2*, Leonardo Campigotto3, Thorsten Knipfer1, Simone D. Castellarin1,2

1 Wine Research Centre, University of British Columbia, Vancouver, BC, Canada
2 Applied Biology, Faculty of Land and Food Systems, University of British Columbia, Vancouver, BC, Canada
3 Department of Agri-food, Environmental and Animal Sciences, University of Udine, Udine, Italy

Contact the author*

Keywords

water deficit, fruit growth, stomata, water potential, isohydricity

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

Effect of culture and familiarity on wine perception: a study with spanish and british wine experts

Wine perception results from the interaction between the wine and its intrinsic and extrinsic characteristics and the experience [1], background and beliefs of the consumer [2,3]. Among all of the factors affecting wine perception, in this study we focused on culture and cognitive processes, working under the hypothesis that higher familiarity with wines would induce higher perceived quality. Furthermore, we hypothesised that culture would influence the verbalisation of wine properties associated with the different experiences of consumers from different cultures.

El viñedo en Lanzarote y el Archipiélago Canario

La isla de Lanzarote, primera en ser ocupada en los albores del siglo XV, es la única del archipiélago, junto con Fuerteventura, que no produjo vino. Ocasionalmente hubo algún parral para el consumo

Effect of non-wine Saccharomyces yeasts and bottle ageing on the release and generation of aromas in semi-synthetic Tempranillo wines

Explore the variability and contribution of non-wine Saccharomyces yeasts and bottle aging on the release and generation of aromas of semi-synthetic Tempranillo wines, together with an in-depth study of the capacity of these strains to provide good fermentative and oenological qualities

Influence of a spontaneous cover crop on the vineyard and soil erosion under Mediterranean climate

Sixty five % of the agricultural area of the Basque Country located in the DO Ca Rioja corresponds to vineyards. More than 40% of it has an average slope greater than 10%, which makes it sensitive to erosive processes. Furthermore, it is foreseeable that extreme weather events (storms, hail, extreme heat and cold, etc.) will be favored due to climate change. Cover cropping can mitigate this risk, and therefore the objective of this work is to evaluate the impact that a vegetable cover has on the agronomic behavior of the vineyard, the quality of the grape and soil erosion. For this, a trial has been carried out with a Graciano variety vineyard with a slope between 10% -20% during the years 2020 and 2021. Conventional tillage management in the area has been compared (4-6 passes per year of tillage machinery) versus spontaneous vegetation cover management in the vineyard. This implies not tilling and allowing the grass of the land to colonize the range between the lines of vines, controlling their height through 1-3 mowing passes per year, always trying to affect the surface of the land as little as possible. The vegetative growth, yield and quality of the grape and wine was measured. Furthermore, erosion has been measured using Gerlasch boxes. The yield was lower in the second year of the trial in the cover crop treatment, but erosion was significantly reduced.

IDENTIFICATION OF NEW RESVERATROL DERIVATIVES FORMED IN RED WINE AND THEIR BIOLOGICAL PROPERTIES

Stilbenes are natural bioactive polyphenols produced by grapevine. Recently, we have reviewed the na- tural presence of these compounds in wines [1]. This study showed that the resveratrol and its glycoside, the piceid, are the most abundant stilbenes in wines. Resveratrol is a well-known stilbene with a wide range of biological activities. Due to its specific structure, resveratrol can be oxidized in wines to form various derivatives including oligomers [2]. In this study, we investigate the resveratrol and piceid transformation in wines.