Table 6. Changes in photosynthetic pigments of wild sand cultivated soybean leaves 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	Chl a (mg g-1 DW)	Chl b (mg g-1 DW)	Chla+b (mg g-1 DW)	Car (mg g-1 DW)
	CK	15.78 ± 0.24A	5.06 ± 0.12A	21.81 ± 0.64A	3.31 ± 0.07A
	L-NS	15.69 ± 0.36AB	4.83 ± 0.25A	20.01 ± 0.24B	3.41 ± 0.21A
	M-NS	15.07 ± 0.27ABC	4.56 ± 0.33A	18.88 ± 0.38BC	3.50 ± 0.72A
W soybean	H-NS	14.52 ± 0.23C	4.43 ± 0.24A	17.90 ± 0.52C	3.84 ± 0.65A
	L-AS	14.79 ± 0.48BC	4.33 ± 0.47A	18.18 ± 0.63C	2.98 ± 0.33AB
	M-AS	12.84 ± 0.14D	2.86 ± 0.22B	15.86 ± 0.61D	2.93 ± 0.35AB
	H-AS	12.73 ± 0.10D	2.42 ± 0.22B	15.17 ± 0.23D	1.77 ± 0.21C
	CK	16.50 ± 0.24a	6.04 ± 0.43a	21.54 ± 0.54a	3.20 ± 0.16a
	L-NS	15.86 ± 0.32a	4.32 ± 0.25b	20.19 ± 0.48b	2.84 ± 0.06ab
	M-NS	14.17 ± 0.37c	3.81 ± 0.12bc	17.98 ± 0.49c	2.41 ± 0.44abc
C soybean	H-NS	13.69 ± 0.10c	3.38 ± 0.31bcd	17.07 ± 0.26c	2.56 ± 0.02abc
	L-AS	14.90 ± 0.22b	3.40 ± 0.19bcd	18.29 ± 0.36c	2.04 ± 0.28bcd
	M-AS	11.56 ± 0.05d	3.02 ± 0.48cd	14.58 ± 0.43d	1.70 ± 0.49cd
	H-AS	10.52 ± 0.10e	2.44 ± 0.26d	12.96 ± 0.37e	1.16 ± 0.21d