Table 2.

Effects of external Ca²⁺ levels on K⁺/Na⁺ selectivity of sos3 and wild-type seedlings treated with 50 mM NaCl

Ca2+ level	K+ content, mg/g dry wt % increase		Na+ content, mg/g dry wt % decrease		K+/Na+ ratio % increase
	Low*	High†	Low*	High†	Low*	High†
WT	53.4 ± 2.0	60.9 ± 0.4 (+14%)	29.8 ± 2.2	27.0 ± 1.3 (−9%)	1.8	2.26 (+26%)
sos3	36.5 ± 0.7	47.6 ± 2.0 (+30%)	51.8 ± 1.8	43.4 ± 3.0 (−16%)	0.7	1.10 (+57%)

Data represent mean ± SE (n = 3). 

*Low Ca²⁺ medium contains 0.3 mM CaCl₂. 

^†High Ca²⁺ medium contains 2 mM CaCl₂.