. 2014 Feb 25;9(2):e89624. doi: 10.1371/journal.pone.0089624

Table 2. The effects of various NaCl concentrations on the ion content and selective absorption of Salvia miltiorrhiza seedlings.

Treatments	Ions contents (µmol g⁻¹ DW)
	Na⁺	K⁺	Ca²⁺	K⁺/Na⁺ ratio	Ca²⁺/Na⁺ ratio
0 mM NaCl	16.1±0.4e	898.7±8.7a	275.8±3.0a	55.9	17.1
25 mM NaCl	167.8±1.7d	769.7±12.1b	275.3±10.3a	4.6	1.6
50 mM NaCl	393.5±23.0c	415.1±9.0c	251.0±1.0b	1.1	0.6
75 mM NaCl	464.8±11.3b	243.8±3.8d	226.0±2.0c	0.5	0.5
100 mM NaCl	502.2±23.0a	224.6±5.6e	221.5±10.5c	0.4	0.4

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).