Table 5.

Effect of heat-stress on specific activities of superoxide dismutase (units/min/mg protein), catalase (µmol H₂O₂ red./min/mg protein) and peroxidase (µmol tetraguaicol formed/min/mg protein) in two contrasting maize genotypes

Days after treatment	DTPYC9F119		K64R
	Control	Heat-stress	Control	Heat-stress
Super oxide dimutase
0	2.83	2.84	2.74	2.74
2	2.39	3.54	2.78	2.97
4	2.68	4.39	2.86	3.44
6	2.93	4.77	2.93	3.78
LSD 0.05 G = 0.07; T = 0.07; D = 0.11; T × D = 0.15; T × G = 0.11; D × G = 0.15; T × D × G = 0.21
Catalase
0	3.18	3.18	1.83	1.82
2	3.86	4.55	1.96	1.93
4	4.27	6.53	2.03	2.78
6	4.90	7.72	2.33	3.30
LSD 0.05 G = 0.10; T = 0.10; D = 0.14; T × D = 0.20; T × G = 0.14; D × G = 0.20; T × D × G = 0.28
Peroxidase
0	21.19	21.19	21.57	21.57
2	21.20	22.55	21.79	22.10
4	21.80	27.86	21.82	23.71
6	22.53	30.30	21.90	24.56
LSD 0.05 G = 0.36; T = 0.36; D = 0.51; T × D = 0.72; T × G = 0.51; D × G = 0.72; T × D × G = NS

G genotype, T temperature treatment, D days after treatment