Estimates for Genetic Variance Components in Reciprocal Recurrent Selection in Populations Derived from Maize Single-Cross Hybrids

Table 4

Heterosis and the direct response to reciprocal recurrent selection (RRS) in maize in the interpopulational hybrid determined on the basis of mean yield (unhusked ear weight t·ha⁻¹).

Populations	Characteristics of mean values of cycle (t·ha^−1)
Population 1	7.19C^b	6.92C
Population 2	7.72C	8.31B
Interpopulational hybrid 1 versus hybrid 2	8.38B	9.52A
Heterosis^a	0.92 (12.3%)	1.9 (24.9%)

aEstimates of heterosis in cycles C0 and C3 were obtained from the mean yield values of the parent populations.
^bValues with the same uppercase letters in the row are not significantly different (Scott and Knott test; P < 0.05).