Table 3.

Correlation between antioxidant enzymes, H₂O₂ and grain yield.

	SOD	POD	PPO	CAT	APX	H2O2	GY
SOD	1	0.88147 **	0.83144 **	0.74785 **	0.22676 ns	0.67906 **	−0.3992 ns
POD	0.88147 **	1	0.78694 **	0.71968 **	0.20204 ns	0.72549 **	−0.5287 **
PPO	0.83144 **	0.78694 **	1	0.80645 **	0.26597 *	0.77561 **	−0.5882 **
CAT	0.74785 **	0.71968 **	0.80645 **	1	0.04098 ns	0.85996 **	−0.7761 **
APX	0.22676 ns	0.20204 ns	0.26597 *	0.04098 ns	1	0.08424 ns	0.03295 ns
H2O2	0.67906 **	0.72549 **	0.77561 **	0.85996 **	0.08424 ns	1	−0.8991 **
GY	−0.3990 **	−0.5287 **	−0.5882 **	−0.7761 **	0.03295 ns	−0.8991 **	1

CAT = catalase; APX = ascorbate peroxidase; POD = peroxidase; SOD = superoxide dismutase; PPO = polyphenol oxidase; H₂O₂ = hydrogen peroxide content; MDA = malondialdehyde; and GY = grain yield. ^ns Not significant. * Significant at a 5% probability level. ** Significant at a 1% probability level.