By day 3 of the flooding period an increase in plant plus soil resistance to water flow (R(p+s)) had occurred (Table 1). At the end of the flooding periods Búlida/RF flooded plants showed greater increases than Búlida/P plants. It should be noted that maximum R(p+s) values did not coincide with the end of the flooding periods (Table 1). Recovery was similar to that of leaf conductance and occurred more rapidly in plants grafted on P than on RF (Table1). Root hydraulic conductivity (Lp) was around 170 and 90mgMPa–1m–1s–1 for control plants grafted on RF and P, respectively. A greater reduction was observed in Búlida/RF plants (37 and 29 % of control values, for T1 and T2 treatments, respectively), whereas the Lp values of Búlida/P only decreased after 6 days of flooding (T2 treatment) (data not shown).