Effects of heat and water stress on grapevine health: primary and secondary metabolism
Grapevine resilience to climate change has become one of the most pressing topics in the Viticulture & Enology field. Vineyard health demands understanding the mechanisms that explain the direct and indirect interactions between environmental stressors. The current climate change scenario, where drought and heat-wave are more frequent and intense, strongly demands improving our knowledge of environmental stresses. During a heatwave, the ambient temperature rises above the plant’s average tolerance threshold and, generally, above 35 oC plant’s adaptation to heat stress is activated1. Likewise, to endure and adjust to water deficits, plants regulate water loss by decreasing stomatal conductance (gs)2,3. In this study, we aimed to investigate how the combination of drought and heat stresses affects grapevine leaf physiology and secondary metabolism. To mimic our current climate change scenario, we induced stressed leaves to a 0.15 < gs < 0.05 mol H2O m-2s-1 range followed by a two-day heatwave where the mean temperature was elevated to +6 ±2.4SD oC compared to control treatment 27 ±3.7SD oC. Further, we explored the metabolic response of grapevine leaves to the multi-stress by detecting and quantifying (through target-metabolomics analysis) anticipated changes in phenolic acids, flavonoids, and stilbenes. The premilitary analysis does not show statistical differences when comparing the stressed leaves with the control. Taken together these results allow us to better understand the mechanisms of resilience to multi-stress and predict how grapevines and vineyards will respond to current climate change.
- Taiz, L., Zeige, E., Moller, I. & Murphy, A. Plant physiology and development. (Sinauer Associates Inc., 2015).
- Jones, H. G. Stomatal control of photosynthesis and transpiration. Journal of experimental botany 387–398 (1998).
- Medrano, H. Regulation of Photosynthesis of C3 Plants in Response to Progressive Drought: Stomatal Conductance as a Reference Parameter. Annals of Botany 89, 895–905 (2002).
Issue: ICGWS 2023
1 INRAE-Bordeaux, Villenave d’Ornon 33882, France
2 Université de Bordeaux, Villenave d’Ornon, France
3 Bordeaux-Sciences Agro, Villenave d’Ornon France