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Seedlings of six Glycine max cultivars were used to compare Cl- with Na+ in stress effects on soybean seedlings under NaCl stress. Results showed that stress of NaCl on G. max seedlings was mainly caused by Cl- and not by Na+. After treatment with isoosmotic solutions of Cl- (without Na+) and Na+ (without Cl-) respectively, fresh weight and height of G. max seedlings growing in solution of Cl- were much more stressed than those in solution of Na+. And the roots and leaves electrolyte leakage were much more increased under stress of Cl- than those under stress of Na+. Salt tolerance of G. max seedlings was mainly contributed to Cl- withheld in roots of seedlings to decrease its content in leaves.
Seedlings of six Glycine max cultivars were used to compare Cl- with Na + in stress effects on soybean seedlings under NaCl stress. Results showed that stress of NaCl on G. max seedlings was mainly caused by Cl- and not by Na +. After treatment with isoosmotic solutions of Cl- (without Na +) and Na + (without Cl-) respectively, fresh weight and height of G. max seedlings growing in solution of Cl- were much more stressed than those in solution of Na +. And the roots and leaves electrolyte leakage were much more increased under stress of Cl- than those under stress of Na +. Salt tolerance of G. max seedlings was mainly contributed to Cl- withheld in roots of seedlings to decrease its content in leaves.