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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Plant Sci. | doi: 10.3389/fpls.2019.01485

Modelling stem water potential by separating the effects of soil water availability and climatic conditions on water status in grapevine (Vitis vinifera L.)

 Bruno Suter1*, Roberta Triolo2, David Pernet2,  Zhanwu Dai1 and  Cornelis Van Leeuwen1*
  • 1Institut des Sciences de la Vigne et du Vin (ISVV), France
  • 2Sovivins Site Montesquieu, France

Measuring seasonal plant water status is critical in choosing appropriate management strategies to ensure yields and quality of agricultural products, particularly in a context of climate change. Water status of grapevines is known to be a key factor for yield, grape composition and wine quality. 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. 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. The objectives of this study are (i) to provide a model that separates the effect of soil water content from the effect of climatic conditions on the SWP value and (ii) to standardize the SWP value to a value under predefined reference climatic conditions in order to compare SWP values collected under different climatic conditions.
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. SWP measurements on two consecutive days with contrasting climatic conditions allowed to assess the impact of these conditions on SWP values.
A large portion of the variability in SWP values was explained by PLWP. Model selection further showed that the addition of maximum air temperature and seasonality explained a significant amount of the remaining variability in SWP values. SWP values could be successfully standardized to a theoretical value under reference climatic conditions, which allows for temporal comparisons of SWP values. More precise interpretation of SWP values provides winegrowers with a tool to more adequately implement short- and long-term management strategies to adapt to drought in order to ensure yield and grape quality.

Keywords: grapevine, water status, Stem water potential, Predawn leaf water potential, Maximum air temperature, modelling

Received: 04 Sep 2019; Accepted: 25 Oct 2019.

Copyright: © 2019 Suter, Triolo, Pernet, Dai and Van Leeuwen. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence:
Mr. Bruno Suter, Institut des Sciences de la Vigne et du Vin (ISVV), Bordeaux, France, b-suter@hotmail.com
Prof. Cornelis Van Leeuwen, Institut des Sciences de la Vigne et du Vin (ISVV), Bordeaux, France, vanleeuwen@agro-bordeaux.fr