terclim by ICS banner
IVES 9 IVES Conference Series 9 International Congress on Grapevine and Wine Sciences 9 2ICGWS-2023 9 Drought tolerance assessment and differentiation of grapevine cultivars using physiological metrics: insights from field studies

Drought tolerance assessment and differentiation of grapevine cultivars using physiological metrics: insights from field studies

Abstract

This study aimed to validate a protocol and compare metrics for evaluating drought tolerance in two Vitis vinifera grapevine cultivars under field conditions. Various metrics were calculated to represent the physiological responses of plants to progressive water deficit. Data were collected from Sauvignon Blanc and Chardonnay plants subjected to three irrigation levels during the 2022-2023 season, along with data from three previous seasons. Hydro-escape areas were used to assess the plant’s ability to reduce water potential with decreasing soil water availability. Sigmoid curves were employed to model the impact of water potential on stomatal conductance (gs) and embolism in shoots. These curves determined the water potential at which gs decreased by 50% () and the water potential at which air extraction from shoots increased by 50% (). Pressure-volume curves estimated the water potential at which leaf turgor loss occurred ().

Additionally, sigmoid curves described the effect of decreased water potential on yield per plant. Results showed that Chardonnay exhibited earlier reduction in gs under moderate water stress compared to Sauvignon blanc, with the latter demonstrating greater water stress tolerance (). S. Blanc maintained higher gs and gas exchange under limited water availability, enabling a 50% reduction in yield per plant () even under low water availability conditions. In contrast, Chardonnay experienced cellular turgor loss () and impaired water conduction in shoots () at lower water availability than S. Blanc, potentially due to a larger hydro-escape area. Overall, cultivars’ capacity to sustain yield per plant under moderate water deficit conditions () was identified as a differentiating metric for cultivars. However, considering the cultivar’s potential yield is crucial to determine the economic viability of partial yield maintenance under a water deficit.

Acknowledgements: Fruit tree physiology Laboratory, ANID Human Capital program.

References:

  1. Henry, C., John, G. P., Pan, R., Bartlett, M. K., Fletcher, L. R., Scoffoni, C., & Sack, L. (2019). A stomatal safety-efficiency trade-off constrains responses to leaf dehydration. Nature Communications, 10(1). https://doi.org/10.1038/s41467-019-11006-1
  2. Gambetta, G. A., Herrera, J. C., Dayer, S., Feng, Q., Hochberg, U., & Castellarin, S. D. (2020). The physiology of drought stress in grapevine: Towards an integrative definition of drought tolerance. Journal of Experimental Botany, 71(16), 4658–4676. https://doi.org/10.1093/jxb/eraa245

Fig. 1 Hydroscape area                                                                                  

Fig. 2 Metrics representing response to drought

DOI:

Publication date: October 11, 2023

Issue: ICGWS 2023

Type: Poster

Authors

Felipe Suárez-Vega1*, Bastián Silva-Gutiérrez¹, Benjamín Velásquez¹, Felipe Torres-Pérez¹, Jose Alcalde, Alonso Pérez-Donoso¹

1Departamento de Fruticultura & Enología, Facultad de Agronomía e Ing. Forestal, Pontificia Universidad Católica de Chile

Contact the author*

Keywords

drought, viticulture, gas exchange, water potential

Tags

2ICGWS | ICGWS | ICGWS 2023 | IVES Conference Series

Citation

Related articles…

Aroma characterization of mold resistant base wines for sparkling wine produced in a warm-temperate area at two different altitudes

In a recent context where consumers pay an increasing attention to sustainability and eco-friendly aspects in the decision-making process, the use of the resistant varieties in the wine sector have returned to the attention. In this context, the use of mould-resistant grape varieties would be an opportunity for sparkling wine producers as it can reduced the pesticide utilization in grape management and hence production costs.
However, the use of the resistant varieties to produce the base wine may be strongly influenced due to its requirements for a particular balance between sugars and acidity to ensure the quality of the final product. In addition, the aromatic profile of base wine plays a crucial role in the perception of the quality of the sparkling wine.

Physico-chemical properties of vine pruning residues with potential as enological additive

Grapes are one of the world’s primary fruit crops, and pruning activities generate high amounts of annual wood wastes [1]. These pruning shoots contain valuable phenolic compounds and could have numerous potential applications [1,2]. Consequently, the aim of this work was to evaluate the physico-chemical properties of vine pruning residues with potential as enological additives. For this purpose, grapevine shoots from 12 varieties grown in Chile were collected during the winter of 2021.

Moderate wine consumption – part of a balanced diet or a health risk?

Consumption of wine/alcoholic beverages remains a topic of great uncertainty and controversy worldwide. The term “no safe level” dominates the media communication and policy ever since population studies in 2018 [1,2] were published, which denied the existence of a J-curve and suggested that ANY consumption of an alcoholic beverage is harmful to health. The scientific evidence accumulated during the past decades about the health benefits of moderate wine consumption, were questioned and drinking guidelines considered to be too loose.

Evaluation of terroir suitability for vine cultivation in new areas using geographic multi-criteria decision support

Based on historical vine cultivation, the recent development of wine production in Drama wine region (Greece) has led to vine cultivation expansion of white and red varieties. The current cultivation of 500 ha of vineyards is expected to increase in the coming years. Natural terroir units (NTU) have been designed recently to support the production of high quality wines in the region [1]. The aim of this work is to evaluate the relevancy of the proposed NTUs regarding their suitability to produce wines of specific sensorial identity, and to provide guidelines for correct site selection for the expanding wine industry of the region.

The colour pattern of flower arrangements influence wine tasters’ sensory description

The arrangements of flowers and wine counterparts are inextricably linked. Whether a fundamental aspect of tablescaping or acolytes to broader entertainment rituals, they have an entangled history since ancient times. The aim of this contribution is to verify the influence of visually delicate and robust flower arrangements on individual description of wines. Changes in the sensory description of wines were investigated during subjects’ (thirty-two participants) exposure to three different conditions: the presence of delicate, robust, or totally absent flower arrangements. In each condition, the same two wines were blind tasted: a wine previously defined as delicate – a Pinot Noir from Australia, and a wine known for its robust character – a Tannat from Uruguay.