Table 6. Effect of K₂SiO₃·nH₂O addition on superoxide dismutase (SOD), peroxide (POD), and catalase (CAT) contents of Honeysuckle (Lonicera japonica L.) plant under NaCl-stressed conditions.

The potency of K2SiO3·nH2O (g L−1)	SOD (Uμg-1 protein) Salt levels (mM of NaCl)
	Control (0mM)	100			200
	Mean ± S.E	Mean ± S.E	Percent of control		Mean ± S.E	Percent of control
0	43.05 ± 7.13bA	49.91 ± 2.65bC	115.9		61.91 ± 1.26aA	143.8
0.5	43.77 ± 2.37bA	59.56 ± 1.87aA	136.1		62.82 ± 4.72aA	143.5
1.0	46.25 ± 1.31cA	54.32 ± 0.73bB	117.4		60.78 ± 5.76aA	131.4
The potency of K2SiO3·nH2O (g L−1)	POD (μg g−1 FW min−1) Salt levels (mM of NaCl)
	Control (0 mM)	100		200
	Mean ± S.E	Mean ± S.E	Percent of control	Mean ± S.E		Percent of control
0	82.22 ± 1.93cB	97.04 ± 0.14bA	118.0		137.0 ± 8.98aA	166.6
0.5	63.89 ± 0.28cC	82.96 ± 6.42bB	129.8		93.23 ± 1.68aB	145.9
1.0	86.67 ± 6.42bA	97.78 ± 3.58aA	112.8		100.0 ± 1.50aB	115.4
The potency of K2SiO3·nH2O (g L−1)	CAT (U mg−1 min−1) Salt levels (mM of NaCl)
	Control (0 mM)	100			200
	Mean ± S.E	Mean ± S.E	Percent of control		Mean ± S.E	Percent of control
0	0.37 ± 0.03cA	0.75 ± 0.03aC	202.7		0.61 ± 0.03bB	164.9
0.5	0.37 ± 0.03bA	0.96 ± 0.06aA	259.5		0.80 ± 0.11aA	216.2
1.0	0.37 ± 0.03bA	0.83 ± 0.02aB	224.3		0.77 ± 0.02aA	208.1

The values represent the means of three replicates. The means followed by the same letters (lower-case letters within lines and upper-case letters within columns, respectively) did not differ significantly at 5% probability by Tukey’s test.