1.9 dS m−1 in the water used for irrigation. According to Munns and
Tester (2008), soils are classified as saline when the EC is equal to
or greater than 4 dS m−1. This EC is equivalent to approximately
40 mM NaCl. Although this definition of saline soils is credible, the
salinity stress response of crops also varies. In some crops, salinity
stress is observed when irrigation water with 15.5 mM Na+ is
used (Edelstein et al., 2005). Therefore, the uptake and transport
of Na+ in grafted plants need further investigation at higher NaCl
concentration.