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.

Download the abstract

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…

Clones of 10 Vitis vinifera varieties: degree of inter- and intra-varietal variation and putative mechanisms underlying clonal variability

Context and purpose of the study. Intra-varietal variability for key physiological and oenologically important traits can be exploit in viticulture following the consistently higher environmental pressure driven by climate change.

Read More

Territorial delimitation of viticultural “Oltrepo Pavese (Lombardy)” using grape ripening precocity

L’Oltrepò Pavese est une zone de collines de la Lombardie, région située au nord de l’Italie avec un vignoble qui s’étend sur près de 15 000 ha. Cette zone représente la plus grande aire de production de la région et une des A.O.C. les plus étendues de tout le pays. Les cépages les plus cultivés, même historiquement, sont autochtones : la Barbera et la Croatina utilisés pour la production de vin rouge «Oltrepò» et le Pinot noir pour la production de vins mousseux. Pour le zonage viticole de cette A.O.C., il a été pris en considération: le climat, les sols, les caractéristiques viti-vinicoles.

Read More

Chemical and sensory diversity of regional Cabernet-Sauvignon wines

AIM: To investigate chemical and sensory drivers of regional typicity of Cabernet Sauvignon from different geographical regions of Australia.

Read More

Grape variety identification and detection of terroir effects from satellite images

Satellite images are used to determine the reflectance dependency to wavelength in different grape varieties (Cabernet-Sauvignon, Merlot, Pinot Noir, and Chardonnay). The terroir influence is investigated through study of vineyards in France, Brazil and Chile.

Read More

Coping with extreme climatic events: some lessons from recent work on grapevine under heat peak

Climate change critically challenges viticulture. Among other threats, extreme and increasingly frequent heatwaves cause irreversible burns on leaves and bunches. A series of observations and experiments was conducted to better understand how leaf burns originate and whether genetics or management practices can mitigate them. In 2019, a panel of 279 potted cultivars of Vitis vinifera L. grown outdoors suffered a heat peak and a genetic origin of leaf burn variability was demonstrated. To deeper explore this variability, fourteen cultivars were selected for their contrasting responses to high temperatures, and detached leaves were submitted to a controlled increase in temperature up to 50 °C in a growth chamber.

Read More