Table 4. Changes in Mn²⁺, B³⁺, Fe³⁺, Cu²⁺ and Zn²⁺ contents of wild and cultivated soybean roots 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	Mn2+	B3+	Fe3+	Cu2+	Zn2+
	CK	0.12 ± 0.01A	0.34 ± 0.01E	0.06 ± 0.00C	0.02 ± 0.00C	0.12 ± 0.00A
	L-NS	0.11 ± 0.00AB	0.37 ± 0.00C	0.13 ± 0.00AB	0.02 ± 0.00AB	0.10 ± 0.00AB
	M-NS	0.10 ± 0.01AB	0.46 ± 0.01C	0.09 ± 0.00BC	0.02 ± 0.00BC	0.09 ± 0.01BC
W soybean	H-NS	0.09 ± 0.00AB	0.54 ± 0.02C	0.08 ± 0.12BC	0.02 ± 0.00C	0.08 ± 0.01BC
	L-AS	0.10 ± 0.01AB	0.39 ± 0.01B	0.16 ± 0.05A	0.03 ± 0.00A	0.10 ± 0.01C
	M-AS	0.10 ± 0.01AB	0.57 ± 0.01AB	0.10 ± 0.01ABC	0.02 ± 0.00AB	0.09 ± 0.00BC
	H-AS	0.09 ± 0.01B	0.61 ± 0.02A	0.08 ± 0.00BC	0.02 ± 0.00C	0.08 ± 0.00C
	CK	0.12 ± 0.00a	0.28 ± 0.01d	0.06 ± 0.01bc	0.02 ± 0.00a	0.11 ± 0.01a
	L-NS	0.11 ± 0.01b	0.32 ± 0.01cd	0.09 ± 0.00ab	0.02 ± 0.00a	0.09 ± 0.00b
	M-NS	0.09 ± 0.00c	0.39 ± 0.01b	0.05 ± 0.00c	0.02 ± 0.00a	0.09 ± 0.00bc
C soybean	H-NS	0.08 ± 0.00cd	0.43 ± 0.03ab	0.05 ± 0.00c	0.02 ± 0.00a	0.07 ± 0.00de
	L-AS	0.09 ± 0.00c	0.33 ± 0.01c	0.12 ± 0.03a	0.02 ± 0.00a	0.08 ± 0.00cd
	M-AS	0.08 ± 0.01d	0.41 ± 0.01b	0.05 ± 0.00bc	0.02 ± 0.00a	0.07 ± 0.00de
	H-AS	0.06 ± 0.00e	0.46 ± 0.01a	0.04 ± 0.01c	0.02 ± 0.00a	0.06 ± 0.00e