terclim by ICS banner
IVES 9 IVES Conference Series 9 GiESCO 9 GiESCO 2023 9 Relationships between sensitivity to high temperature, stomatal conductance and vegetative architecture in a set of grapevine varieties

Relationships between sensitivity to high temperature, stomatal conductance and vegetative architecture in a set of grapevine varieties


High temperatures influence plant development and induce a large set of physiological responses at the leaf scale. Stomatal closure is one of the most observed responses to high temperatures. This response is commonly considered as an adaptive strategy to reduce water loss and embolism in the vascular system caused by the high evaporative demand (Jones and Sutherland., 1991). Nevertheless, this response negatively impacts plant functioning, as it decreases photosynthesis and raises the leaf temperature (Tuzet et al., 2003). This increase in temperature is due to a decrease in energy loss by evaporative cooling. In extreme cases, this increase can induce leaf burning symptoms and lead to leaf or entire plant mortality (Webb et al., 2010).

In the context of global warming, the occurrence of extreme heatwaves events is expected to increase in almost all the vineyard areas. These events can cause major risks for the perennity of this cropping system. In this context there is a need to develop new varieties more adapted to high temperatures. For instance in the south of France in June 2019 a major heatwave was observed with air temperature higher than 45°C. Previous analyses made during this period, showed high genotypic variability in the sensitivity to this leaf burn symptoms in a core collection of varieties that was grown in Montpellier (South of France).

To apprehend the physiological determinants explaining these genotypic differences, it is necessary to understand the factors that affect leaf temperature. Leaf temperature results from the leaf energy balance. This energy balance depends on the amount of solar radiation intercepted by the canopy and on the ability of the leaf to transfer this energy through evapotranspiration. In that context, there exist two leverages that limit this increase in leaf temperature. First, reducing the amount of light intercepted and secondly maintaining stomatal aperture even under high temperature. Previous studies in grapevine showed high genotypic variability in stomatal behavior under water deficit in grapevine (Coupel-Ledru et al., 2014). Conversely, the studies on the response to temperature are more scarce. Regarding the amount of light intercepted, plant architecture plays a major role in light capture (Louarn et al., 2008). From the multitude of architectural traits: leaf shape and size, petiole length, and leaf 3D orientation significantly influence the efficiency of radiation interception (Falster and Westoby, 2003; Valladares and Brites, 2004).

A large genotypic variability in architectural traits was also observed in many plants (Segura et al., 2007 in apple). However, no study investigated the genotypic variation in architectural traits in grapevines and their potential impact on leaf functioning. In grapevine, a previous study showed intra-plant variability in leaf angles with respect to the training systems (Mabrouk et Carbonneau, 1997). However, this study did not consider any genotypic variability. Consequently, the definition of new architectural and functional ideotypes to face hatewaves in vineyards is a particularly relevant research topic.


Publication date: June 21, 2023

Issue: GiESCO 2023

Type: Article



UMR LEPSE, Univ Montpellier, INRAE, Institut Agro-Montpellier, Montpellier, France

Contact the author*


plant architecture, leaf orientation, energy balance, leaf temperature, genotypic variability


GiESCO | GIESCO 2023 | IVES Conference Series


Related articles…

Physiological and growth reaction of Shiraz/101-14 Mgt to row orientation and soil water status

Advanced knowledge on grapevine row orientation is required to improve establishment, management and outcomes of vineyards on terroirs with different environmental conditions (climate, soil, topography) and in view of a future change to more extreme climatic conditions. The purpose of this study was to determine the combined effect of row orientation, plant water status and ripeness level on the physiological and viticultural reaction of Shiraz/101-14 Mgt.

Effects of mechanical leafing and deficit irrigation on Cabernet Sauvignon grown in warm climate of California

San Joaquin Valley accounts for 40% of wine grape acreage and produces 70% of wine grape in California. Fruit quality is one of most important factors which impact the economical sustainability of farming wine grapes in this region. Due to the recent drought and expected labor cost increase, the wine industry is thrilled to understand how to improve fruit quality while maintaining the yield with less water and labor input. The present study aims to study the interactive effects of mechanical leafing and deficit irrigation on yield and berry compositions of Cabernet Sauvignon grown in warm climate of California.

The effects of cane girdling on berry texture properties and the concentration of some aroma compounds in three table grape cultivars

The marketability of the table grapes is highly influenced by the consumer demand; therefore the market value of the table grapes is mainly characterized by its berry size, colour, taste and texture. Girdling could cause accumulation of several components in plants above the ringing of the phloem including clusters and resulting improved maturity. The aim of the experiments was to examine the effect of girdling on berry texture characteristics and aroma concentration.

Application of a fluorescence-based method to evaluate the ripening process and quality of Pinot Blanc grape

The chemical composition of grape berries at harvest is one of the most important factors that should be considered to produce high quality wines. Among the different chemical classes which characterize the grape juice, the polyphenolic compound, such as flavonoids, contribute to the final taste and color of wines. Recently, an innovative non-destructive method, based on chlorophyll fluorescence, was developed to estimate the phenolic maturity of red grape varieties through the evaluation of anthocyanins accumulated in the berry skin. To date, only few data are available about the application of this method on white grape varieties.

Different yield regulation strategies in semi-minimal-pruned hedge (SMPH) and impact on bunch architecture

Yields in the novel viticulture training system Semi-Minimal-Pruned Hedge (SMPH) are generally higher compared to the traditional Vertical Shoot Positioning (VSP). Excessive yields have a negative impact on the vine and wine quality, which can result in substantial losses in yield in subsequent vintages (alternate bearing) or penalties in fruit quality. Therefore yield regulation is essential. The bunch architecture in SMPH differs from VSP. Generally there is a higher amount but smaller bunches with lower single berry weights in SMPH compared to VSP.