Table 2. Changes in root length, root fresh weight and dry weight of wild and cultivated soybean under control and salt stress conditions.

The values are shown as mean ± SE. Different letters (A-G and a-g) mark significantly different values at P < 0.05 according to Duncan’s method. W, wild soybean; C, cultivated soybean; CK, Control; L-NS, M-NS, and H-NS represent low (10 mmol L⁻¹), medium (20 mmol L⁻¹) and high (30 mmol L⁻¹) concentrations of saline salt stress, respectively; while L-AS, M-AS and H-AS represent low (10 mmol L⁻¹), medium (20 mmol L⁻¹) and high (30 mmol L⁻¹) concentrations of alkaline salt stress, respectively.

Variety	Treatment	Root length (cm)	Root fresh weight (g)	Root dry weight (g)
	CK	31.77 ± 1.01AB	3.90 ± 0.79A	0.70 ± 0.13A
	L-NS	32.40 ± 0.46A	3.80 ± 0.55A	0.57 ± 0.06AB
	M-NS	32.40 ± 1.04A	3.70 ± 0.21A	0.49 ± 0.03AB
W soybean	H-NS	30.77 ± 1.72AB	3.23 ± 0.20A	0.49 ± 0.08AB
	L-AS	29.70 ± 1.65AB	3.47 ± 0.42A	0.50 ± 0.04AB
	M-AS	29.13 ± 1.13AB	3.20 ± 0.36A	0.45 ± 0.06B
	H-AS	28.07 ± 1.32B	2.73 ± 0.27A	0.38 ± 0.04B
	CK	33.07 ± 1.97a	13.30 ± 0.61a	2,34 ± 0.26a
	L-NS	29.90 ± 1.19ab	12.70 ± 0.86a	1.74 ± 0.13b
	M-NS	29.37 ± 2.08abc	11.97 ± 0.39a	1.68 ± 0.25b
C soybean	H-NS	28.77 ± 0.93abc	10.23 ± 0.32a	1.36 ± 0.04bc
	L-AS	29.37 ± 1.74abc	12.00 ± 0.50a	1.45 ± 0.14b
	M-AS	25.47 ± 1.37bc	9.80 ± 3.11a	1,23 ± 0.07bc
	H-AS	24.37 ± 1.15c	8.87 ± 3.07a	0.89 ± 0.08c