Quantifying water use diversity across grapevine rootstock-scion combinations
Vines require proper light levels, temperature, and water availability, and climate change is modifying these factors, hampering yield and quality. Despite the large diversity of rootstocks, varieties, and clones, we still lack knowledge of their combined effects and potential role in a warmer and dryer future. Therefore, we aim to characterize some of the existing diversity of rootstocks and genotypes and their interaction at the eco-physiological level, combining stomatal conductance (gs) and chlorophyll a fluorescence analysis. The measurements were performed at the GreffAdapt experimental vineyard of ISVV in the following variety-rootstock combinations: Grenache, Syrah and Cabernet-Sauvignon cv. grafted onto the rootstocks 110R, 1103P, M4, SO4, 5BB, and 140Ru. Preliminary results show a significant effect of the rootstock, particularly on stomatal conductance and to a lesser extent on the quantum yield of photosystem II (ᶲPSII). Some rootstocks appear to result in much lower levels of gs and quantum yield of photosystem II (ᶲPSII), suggesting a higher sensitivity to water stress and/or a water use strategy to balance water status at the expense of photochemistry energy utilization. These results will be integrated with vigor and yield parameters to achieve a comprehensive insight of rootstock-genotypes response under applied contexts. Furthermore, these data highlight the importance of exploring the plasticity of existing rootstock-scions combinations and ultimately providing winegrowers with the knowledge and tools to adapt their vineyards to future environmental constraints.
Acknowledgements: This work was supported by the Sustainable Crop Production (FACCEJPI) -ERA-NET Cofund Action (Ref. Nr 59 – DIVERGRAPE) under H2020 Horizon Europe programme.
Issue: ICGWS 2023
1EGFV – ISVV, INRAE, 210 Chemin De Leysotte, 33882 Villenave D’Ornon, France