Table 3. Effects of different potassium chloride supplies on nitrate reductase (NR), glutamine synthetase (GS), and the concentrations of soluble protein and free amino acids (FAA) in the leaves of P. vulgaris.

	K0	K1	K2	K3
NR (µg g−1 FW h−1)	5.65±0.31 c	7.33±0.33 b	9.06±0.42 a	6.97±0.74 b
GS (Unit g−1 FW h−1)	0.10±0.01 b	0.13±0.01 a	0.14±0.02 a	0.12±0.01 ab
Soluble protein (mg g−1 FW)	8.57±0.18 c	9.03±0.46 c	12.77±0.23 a	11.31±0.35 b
FAA (mg 100 g−1 FW)	9.46±0.58 c	11.99±0.81 b	13.56±0.48 a	13.05±0.95 ab

Note: Each value is the mean ± SE (n = 6). Values that are followed by a different letter in the same line are significantly different according to Duncan's multiple range test (P<0.05). K0, K1, K2 and K3 indicate 0, 1.00, 6.00 and 40.00 mM KCl, respectively.