Table III.

Activities of COX, mtPOX, and CPX, and the degree of lipid peroxidation (TBARS) of the mitochondria isolated from shoots of maize seedlings of parental lines and populations grown at 25°C and 14°C

Material	COX	mtPOX	CPX	TBARS
	μmol Cyt c min−1 mg−1 protein	μmol guaiacol min−1 mg−1 protein	μmol Cyt c min−1 mg−1 protein	(A532–A600) mg−1 protein
25°C
Parental lines
B73	1.81	0.21	0.13	0.13
IABO78	1.87	0.23	0.15	0.13
Populations
C0	1.86	0.23	0.14	0.14
C4-L	1.82	0.22	0.13	0.12
C4-H	1.88	0.24	0.14	0.14
Meana	1.85	0.23	0.14	0.13
lsdb	0.02	nsc	0.02	ns
lsdd	ns	ns	ns	ns
14°C
Parental lines
B73	1.23	0.36	0.35	0.29
IABO78	1.33	0.40	0.36	0.25
Populations
C0	1.27	0.38	0.35	0.26
C4-L	0.80	0.27	0.34	0.46
C4-H	1.41	0.51	0.35	0.22
Meana	1.11	0.39	0.34	0.34
lsdb	0.03	0.02	ns	0.02
lsdd	0.02	ns	ns	0.02

Results are the averages of four determinations (two experiments and two samples per experiment).

^aMean value of the two selected populations, C4-L and C4-H. 

^blsd (P ≤ 0.05) for comparing parental lines and/or populations. 

^cns, Not significant. 

^dlsd (P ≤ 0.05) for comparing the source population C0 with the mean of C4-L and C4-H.