Grapevine varieties exhibiting differences in stomatal response to water deficit
Joaquim M Costa1, Maria F Ortu O2, Carlos M Lopes1
1Centro de Botânica Aplicada à Agricultura, Instituto Superior de Agronomia - UTL, Tapada da Ajuda, 1349-017 Lisboa, Portugal.
Functional Plant Biology : FPB
|June 3, 2020
Summary
Understanding grapevine water use efficiency is crucial for optimizing irrigation and breeding. This study reveals that canopy temperature and leaf water potential can help differentiate grapevine varieties
Area of Science:
- Plant physiology
- Viticulture
- Environmental science
Background:
- Knowledge on variety traits and physiological responses to stress is scarce in Vitis vinifera L.
- This limits the optimization of irrigation and breeding for high water use efficiency.
Purpose of the Study:
- Characterize five grapevine varieties for their physiological responses to water stress.
- Investigate the relationship between canopy temperature, leaf gas exchange, leaf morphology, and carbon isotope composition.
Main Methods:
- Utilized thermal imaging, leaf gas exchange measurements, leaf morphology analysis, and carbon isotope composition.
- Conducted field experiments with five grapevine varieties (Aragonez, Trincadeira, Cabernet Sauvignon, Syrah, and Touriga Nacional) under different irrigation regimes (well-irrigated, non-irrigated, regulated deficit irrigation).
Main Results:
- Leaf temperature (Tleaf) negatively correlated with stomatal conductance (gs) and leaf water potential (Ψpd), especially in the afternoon.
- Different grapevine genotypes exhibited distinct Tleaf responses for similar Ψpd.
- Stomatal density did not correlate with gs, indicating genotypic variation in stomatal control.
Conclusions:
- Combined measurements of canopy temperature and Ψpd aid in understanding stomatal regulation in different grapevine varieties.
- Genotypic variations in stomatal regulation should be considered when determining irrigation strategies for Vitis vinifera L.
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