Antioxidant enzymes and non-enzymatic antioxidants as defense mechanism of salinity stress in cowpea (Vigna unguiculata L. Walp)—Ife brown and Ife bpc

Bulletin of the National Research Centre

Table 4 Superoxide dismutase (SOD) activities in the leaves of Ife brown (IFB) and Ife bpc (IBPC) under NaCl and Na₂SO₄ salinity stress

Treatment	Conc (dS/m)	Biochemical parameters (mean ± SE)
Treatment	Conc (dS/m)	IFB SOD (%)	IFBPC SOD (%)
NaCl	5.00	38.87 ± 0.18b	45.24 ± 1.37d
	10.00	42.11 ± 0.27c	42.86 ± 0.01cd
	15.00	48.81 ± 0.20d	28.67 ± 0.06b
Na₂SO₄	5.00	36.16 ± 2.38c	38.19 ± 1.37ab
	10.00	45.76 ± 0.19d	26.59 ± 1.38a
	15.00	51.10 ± 0.01e	21.06 ± 0.02c
Distilled H₂O	0.0	51.50 ± 2.89e	46.03 ± 4.20d

Means followed by different letters in the column are significantly different (P < 0.05) from one another using Duncan’s new multiple range test (DNMRT)