terclim by ICS banner
IVES 9 IVES Conference Series 9 Cumulative effects of repeated drought stress on berry composition, and phenolic profile: Field experiment insights

Cumulative effects of repeated drought stress on berry composition, and phenolic profile: Field experiment insights

Abstract

Drought stress has a profound impact on grapevine productivity and significantly alters key quality-related traits of berries. Although research has been conducted on the effects of individual drought events, there is still a knowledge gap regarding the cumulative consequences of repeated exposure to water scarcity and the influence of the timing of stress imposition. To address this gap, a field experiment was conducted to investigate the impacts of repeated drought stress on yield, berry composition, and the phenolic profile of grape berries. The results indicate that yield is primarily influenced by pre-veraison water deficit. Although the number of clusters was only slightly reduced, a substantial decrease in berry size was observed, resulting in a notable reduction in overall yield. The comparison between sun-exposed and shaded berries revealed an interplay between light exposure and water availability. Furthermore, pre-veraison drought stress resulted in a decrease in titratable acidity, leading to an increase of must pH at harvest time. These results emphasize the impact of early drought events on berry composition, persisting until harvest. This indicates the importance of maintaining optimal water supply during early growing season. The study suggests the potential to conserve water resources by strategically adjusting irrigation intensity during the late growing season.

Download the abstract

DOI:

Publication date: June 13, 2024

Issue: Open GPB 2024

Type: Poster

Authors

Patrick Pascal Lehr1*, Charles Obiero2, Markus Keller2, Christian Zörb1

1 University of Hohenheim, Institute of Crop Science, Quality of Plant Products, Stuttgart, Germany
2 Washington State University, Irrigated Agriculture Research and Extension Center, Department of Viticulture and Enology, Prosser, WA, USA

Contact the author*

Keywords

recurrent drought stress, berry quality, phenolic composition, yield, water saving strategies

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

Iso-/anisohydric behavior in wine grapes may be a matter of soil moisture

There are claims that wine grape cultivars are either isohydric or anisohydric; the former maintaining, and the latter decreasing, their plant water status as soil moisture declines. However, available information is inconsistent. There are those that show an existence of a continuum in cultivar response to soil moisture rather than a distinct categorization. Others even show both behaviors in the same cultivar grown in different environments. In this study we investigated the behavior of 30 own rooted Vitis vinifera cultivars during successive drydown and rewatering cycles over two growing seasons in arid eastern Washington (<200 mm annual precipitation).

Read More

From vineyard to bottle. Rationalizing grape compositional drivers of the expression of valpolicella aroma ‘terroir’

AIM: Valpolicella is a renowned Italian wine-producing region (Paronetto, 1981). Wines produced in its different sub-regions are anecdotally believed to be aromatically different, although there is no systematic study addressing the chemical bases of such diversity

Read More

Composition and extractability of grape anthocyanin glucosides under different environmental conditions: terroir and vintage effects

Two terroirs of the Eger Wine District (a steep-sloped and a flat vineyard) were examined in two years in order to describe the changes in the concentration and composition of berry skin/wine anthocyanins of the Kékfrankos variety at different harvest dates and to examine a possible relationship between the extractability of anthocyanin glucosides and terroir/vintage characteristics.

Read More

Post-plant nematicides: too little, too late for Northern root-knot nematode management

Context and Purpose. Management of plant-parasitic nematodes in perennial cropping systems such as wines grapes is challenging.

Read More

Cell wall remodeling mediated by specific PME genes plays a role in grapevine response to Botrytis cinerea

Botrytis cinerea (Bc) is one of the main pathogens affecting the cultivated grapevine. A key role in grapevine tissue colonization is played by cell wall (CW) remodeling driven by CW Modifying Enzymes (CWMEs), expressed both by the host and the pathogen. Their action can impact CW integrity and trigger specific immune signaling, thus influencing Bc infection outcome. To further characterize the role of the CW in the grapevine response to Bc, two contrasting genotypes in their resistance to the fungus were artificially inoculated at full bloom. RNA-seq analysis and biochemical characterization of the CW and its modification in samples collected at 24 hours post-inoculation highlighted significant differences between genotypes.

Read More