Root hydraulic conductance (L0) was measured by pressurisingthe roots using the Schölander chamber (Jackson et al., 1996). Forthis, the aerial parts of the plants were removed and the stemswere placed in plastic tubes. The roots were placed in a pressurechamber, with the same nutrient solution that they were grown in,and a gradual increase of pressure (from 0.1 to 0.4 MPa) was appliedto them. The sap that accumulated in this pressure range during acertain time, according to the treatment, was collected in Eppendorftubes. The roots and the tubes were weighed in a precision balance.The sap flow (JV) was expressed in mg g (root fresh weight)−1h−1and plotted against pressure (MPa), the slope being the L0valuein mg g (root fresh weight)−1h−1MPa−1). The measurements weremade in the middle of the photoperiod, two weeks after applyingNaCl.