TRANSBIO SUDOE aims at promoting interdisciplinary and interregional research in the field of health & life sciences.
TRANSBIO SUDOE can provide mobility support (transport & accommodation) for scientists interested in setting up collaborative research projects.
Below the procedure to launch a collaborative project :
Request for technical support : - Need of TTO's support to ease collaboration agreements : No - Need for identification of funding opportunities (regional, national, European) : No
Added value of the cooperation : we will be be able to complement each other groupís know-how in new technologies allowing grapevine phenotyping of varieties more resistant to abiotic stress and management techniques with higher water use efficiency
Summary of the proposal :
Climate change predictions indicate an increment of water scarcity in semi-arid viticulture areas increasing the need to reduce water usage. Therefore, improving water use efficiency (WUE) in grapevines becomes crucial to make viticulture sustainable.
Large intra-specific natural variations in WUE have been described in grapevines and considered as an opportunity for improving WUE (Flexas et al. 2010). At the level of leaf physiology this implies high rate of productivity (AN) with low water losses (low stomatal conductance).Stomatal and mesophyll conductance limit photosynthesis significantly, and consequently, besides stomatal conductance, mesophyll conductance is also a physiological process that could affect water use efficiency (WUE). Therefore, considering the state of the art, the aims of the present proposal are: (i) to study the response of different cultivars under different irrigation dosage treatments to determine the physiological mechanisms involved in the variations of WUE
In this project we will explore one of the most commonly used cultivar (Tempranillo) and a native cultivar of Portugal (Touriga Nacional) in an experimental field located in Portugal (Reguengos de Monsaraz, Herdade do Esporão), under two different irrigation dosage treatments, regulated and sustained deficit irrigation (RDI and SDI, respectively).
The methodology is described below:
Estimation of water use efficiency
- Leaf gas exchange measurements
- Carbon isotope composition in leaf and berry dry matter
Estimation of mesophyll conductance by different methods
- Gas exchange and fluorescence measurements (Harley method).
- Gas exchange measurements (Ethier method).
- Anatomical measurements (Anatomical method).
- Stomatal density
The experiment will be performed in Portugal (1st visit)
Ricardo RODRIGUEZ, Galicia Anais GONZALEZ, Barcelona
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