The response of tomato rootstocks to salinity was studied in a PE covered greenhouse during the spring season of 2005. 'Maxifort' and 'Vigomax' hybrid rootstocks grafted with commercial cultivar 'Durinta F-1' were used. Self grafted plants were used as control treatment. Two EC levels of nutrient solution (2 and 6 dS m(-1)) were applied to the plants in perlite culture. Salinity level of the nutrient solution was increased using NaCl three weeks after planting. Irrigation timing was based on indoor integrated solar radiation level of 1.0 MJ m(-2). The amount of nutrient solution was adjusted according to the ratio of drain water/applied volume. Yield parameters (total and marketable yield, fruit number and mean fruit weight) and fresh and dry weight of plant parts were measured. Increasing of EC level from 2 to 6 dS m(-1) caused a significant reduction in yield parameters. The use of rootstocks increased the marketable yield. The reduction of yield by the increasing salinity levels was lower in the grafted treatments. Yield and WUEs were higher in grafted plants. Higher water consumption was observed when rootstocks were used.