Figure 3. The effects of various NaCl concentrations on the osmolyte contents of Salvia miltiorrhiza leaves.

The osmolyte contents measured in the experiment include the soluble protein and soluble sugar contents. Salvia miltiorrhiza seedlings were cultivated in 1/2 Hoagland nutrient solution for 3 weeks and were later exposed to salt stress by adding NaCl up to 25, 50, 75 and 100 mM of the hydroponic solution for 30 days. Non-treated plants were used as controls (0 mM NaCl). Error bars represent the standard errors (SE) of the means.