Guillaume Charrier(1, 2, 3, 4, *), Régis Burlett(2), Gregory Gambetta1, Sylvain Delzon(2), Jean-Christophe Domec(3) and François Beaujard(4)
1. Bordeaux Sciences Agro, Institut des Sciences de la Vigne et du Vin, Ecophysiologie et Génomique Fonctionnelle de la Vigne, UMR 1287, Villenave d’Ornon, France;
2. BIOGECO, INRA, Univ. Bordeaux, Cestas, France;
3. Bordeaux Sciences Agro, UMR 1391 ISPA, INRA, 1 Cours du General de Gaulle, Gradignan Cedex, France;
4. PIAF, INRA, UCA, Clermont-Ferrand, France
*For correspondence: [email protected]
Xylem sap circulates under either positive or negative hydraulic pressure in plants.
Negative hydraulic pressure (i.e., tension) is the most common situation when transpiration is high, and several devices have been developed to quantify it accurately (e.g., Scholander pressure chamber, psychrometers).
However, a proper measurement of positive xylem sap pressures may be critical when pressure is generated by the root system, allowing vessels to be refilled.
Here, we describe two different methods to monitor positive xylem bulk pressure: the pressure gauge which can only be set onto a rootstock or a side branch, and the point pressure sensor, which can allow measurements from a functioning plant without detopping or cutting.
Keywords: Pressure, Tension, Water status, Xylem water potential