Relationship between SWP and PLWP along a temperature gradient collected during the 20 seasons for each experimental plot (n=1,061). The differential water status of grapevines on the different soils are shown in Figure 1. SWP measurements on two consecutive days with contrasting climatic conditions allowed to assess the impact of these conditions on SWP values. Main characteristics of the vineyards studied. For these purposes, SWP and PLWP were temporally assessed on three soil types in Saint-Émilion (Bordeaux, France) in 2015 and on five soil types in Margaux (Bordeaux, France) in 2018 using a pressure chamber (Table 1). A subsequent standardization of the SWP value to predefined reference climatic conditions would allow for its comparison under different climatic conditions. This study first aimed at providing a model that separates the effect of soil water content from the effect of climatic conditions on the SWP value. A drawback of SWP is that it does not allow for temporal comparisons, because the measured value is impacted both by soil water availability and climatic conditions on the day of measurement. Predawn leaf water potential (PLWP) and stem water potential (SWP) proved to be simple and precise indicators for assessing grapevine water status and subsequent same-day spatial comparisons. The water status of grapevines is known to be a key factor for yield, grape composition at ripeness and wine quality (Van Leeuwen et al., 2009). Measuring seasonal plant water status is an essential step in choosing appropriate adaptations in management strategies to ensure yield and quality of agricultural products in these changing conditions. By Bruno Suter, Roberta Triolo, David Pernet, Zhanwu DAI, Cornelis Van LeeuwenĬlimate change will result in an increase in temperature and an intensification of drought in many regions across the globe (IPCC, 2014).

Grape water