After measuring the dry weights, the Na+, K+, and Cl− from the
roots and shoots were extracted and measured according to the
procedure described by Xu et al. (2006). The Na+ and K+ concentrations
were analyzed with atomic absorption spectrophotometer
(Varian spectra AA 220, Varian, Palo Alto, CA, USA). The Cl− concentration
was determined by silver nitrate (AgNO3) titration using a
neutralindicator agent containing 4.2%(w/v)K2CrO4 and0.7%(w/v)
K2Cr2O7. The average Na+ andCl− concentrations ofthe whole plant
were then calculated.