TABLE 3.

Changes in the ratios of K⁺/Na⁺, Ca²⁺/Na⁺, and Mg²⁺/Na⁺ ratios in different tissues of canola seedlings after 7 days of NaCl and Na₂CO₃ stress.

Treatment	Concentration (mM)	K+/Na+			Ca2+/Na+			Mg2+/Na+
		Root	Stem	Leaf	Root	Stem	Leaf	Root	Stem	Leaf
Control	0	1.67 ± 0.39aA	1.55 ± 0.16aA	1.99 ± 0.18aA	0.82 ± 0.08aC	1.23 ± 0.15aB	2.26 ± 0.18aA	0.63 ± 0.04aC	0.94 ± 0.02aB	1.19 ± 0.03aA
NaCl	100	0.59 ± 0.02bA	0.36 ± 0.03bB	0.36 ± 0.01bcB	0.72 ± 0.02aA	0.32 ± 0.04cB	0.17 ± 0.01bC	0.62 ± 0.03aA	0.28 ± 0.03cB	0.13 ± 0.01cC
	150	0.64 ± 0.17bA	0.49 ± 0.03bA	0.44 ± 0.06bA	0.76 ± 0.12aA	0.48 ± 0.05bB	0.16 ± 0.01bC	0.61 ± 0.07aA	0.43 ± 0.04bB	0.14 ± 0.01bcC
	200	0.40 ± 0.01bA	0.33 ± 0.03bB	0.24 ± 0.04cC	0.45 ± 0.01bA	0.28 ± 0.02cB	0.27 ± 0.02bB	0.38 ± 0.04bA	0.25 ± 0.02cB	0.17 ± 0.01bC
Control	0	1.67 ± 0.39aA	1.55 ± 0.16aA	1.99 ± 0.18aA	0.82 ± 0.08bC	1.23 ± 0.15aB	2.26 ± 0.18aA	0.63 ± 0.04bC	0.94 ± 0.02aB	1.19 ± 0.03aA
Na2CO3	20	0.43 ± 0.16bB	0.66 ± 0.05bB	1.31 ± 0.18bA	0.85 ± 0.12bA	0.49 ± 0.04cB	0.84 ± 0.17bA	0.59 ± 0.03bA	0.43 ± 0.03cB	0.65 ± 0.10bA
	30	0.31 ± 0.11bB	0.57 ± 0.08bB	1.11 ± 0.23bA	0.81 ± 0.19bA	0.73 ± 0.07bA	0.66 ± 0.18bcA	0.55 ± 0.11bA	0.67 ± 0.08bA	0.49 ± 0.13bA
	40	0.03 ± 0.00bC	0.47 ± 0.12bB	1.09 ± 0.05bA	1.21 ± 0.09aA	0.60 ± 0.11bcB	0.51 ± 0.06cB	0.85 ± 0.03aA	0.54 ± 0.10bcB	0.51 ± 0.06bB

Different lowercase letters in the same column indicate significant differences among NaCl or Na₂CO₃ concentrations, and different uppercase letters in the same row indicate significant differences among plant tissues within the same treatment, according to a least significant difference (LSD) test (P < 0.05).