| Sumario: | The objectives of this work were to assess heterosis and its components in F 1 hybrids of
a diallel cross among lines of scarlet eggplants (Solanum gilo Raddi, syn. S. aeth opicum L.),
and to study the modes of gene action associated with its expression. Six lines
(Morro Redondo, Branco Comprido, BGH-1544, Tinguá, Irajá, Comprido Verde Claro) and
15 hybrids resulting from a diallel cross among them (reciprocals excluded) were tested in
a randomized complete block design with four replications. Traits under study were total
yield, mean fruit mass and fruit length/diameter ratio. There was no evidence of epistatic
gene action in the expression of any of the traits under study. Heterosis for yield could be
explained by overdominance, but higher yields were only weakly associated with larger
frequencies of dominant alleles an indication that yields may be markedly influenced by
the action of relatively few loci with overdominant gene action. Heterosis for mean fruit
mass was associated with incompletely dominant gene action, and larger fruit mass was
associated with larger proportions of dominant alleles.
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