The effects of various NaCl concentrations on the ion content and selective absorption of Salvia miltiorrhiza seedlings.

The seedlings were cultivated in 1/2 Hoagland nutrient solution for 3 weeks and were later exposed to salt stress by adding NaCl to concentrations of 25, 50, 75 and 100 mM of the hydroponic solution for 30 days. Non-treated plants were used as controls (0 mM NaCl). Each value represents the mean of three replications. Treatments with the same letters are not statistically different (P≥0.05).