Table 1. Genetic effects and heritabilities of nine CCM enzyme activities.

Enzymea	Genetic effect P-valueb	Raw Heritabilityc	Normalized Heritabilityd
IDH	2.9E-08	0.68	0.40
G6PDH	2.9E-05	0.61	0.57
ALD	4.3E-05	0.58	0.57
PGM	7.0E-04	0.55	0.47
FUM	0.003	0.55	0.33
NADP-IDH	5.7E-05	0.49	0.42
PGK	0.025	0.26	0.16
GLK	0.030	0.25	0.20
GAPDH	0.052	0.22	0.08
Mean-STD activity	5.5E-05	0.53

Values were calculated from a set of 8 diverse maize inbred lines grown and measured in five replications.

^aIDH: NAD-dependent isocitrate dehydrogenase, G6PDH: glucose-6-phosphate dehydrogenase, ALD: fructose-biphosphate aldolase, PGM: phosphoglucomutase, FUM: fumarase, NADP-IDH: NADP-dependent isocitrate dehydrogenase, PGK: phosphoglycerate kinase, GLK: glucokinase, GAPDH: NADP-dependent glyceraldehyde 3-phosphate dehydrogenas.e.

^bThe taxa effect in a one-way ANOVA.

^cBroad-sense heritability, the proportion of the genetic variation from the total phenotypic variation (σ² _G/(σ² _G+σ² _E)).

^dNormalized heritability was calculated in the same way as broad-sense heritability but using normalized enzyme activity values that are the difference between each individual standardized activity value of a sample and the mean standardized activity of each sample across the 10 enzymes.