| Summary: | The objectives of this research were to investigate
the genetic structure of the 20 F1s rapeseed hybrids
established from five female moderate maturing lines
and four early maturing male testers, determine parents
showing general combining ability (GCA) and assess
crosses demonstrating specific combining ability (SCA).
Significant mean squares of lines and testers determined
GCA and confirmed the presence of additive genes that
were influencing the traits, while the significance of line×tester
interactions indicated the importance of SCA of
parents and demonstrated the importance of dominance
or non-additive genetic effects. Significant variance of
parents vs. crosses revealed significant average heterosis
for all the traits except first pod height and seeds per
pod. High narrow-sense heritability estimates for number
of branches and pod length indicated the importance of
additive genetic effects for these traits. Significantly positive
correlation was exhibited between GCA effects on
pods on main raceme and seed yield and, therefore, the
GCA effect on pods on main raceme can be used as indirect
selection criterion for improvement of seed yield. The
crosses L41×Foma2, Zafar×R42 and L22B×R38 recorded
significant positive SCA effects and high mean values of
seed yield of 3400, 3311.3 and 2904.2 kg ha-1, respectively.
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