International Journal of Horticulture 2015, Vol.5, No.17, 1
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performance. This is true with respect to cherry,
Currant, UC28B and Romavf for all characters under
study. This suggested that combining ability of parent
used in this study can be judge accurately by their
perse performance. Similar results were reported by
Dhaliwal et al. (2000) in brinjal. Bad general
combiners for all characters under study except for
percentage damaged fruits were recorded by the lines
Golden Roma and RioGrandei indicating that their
hybrids performed below average. The high positive
general combining ability (GCA) for percentage
damaged fruits indicated their high level of
susceptibility to heat. Ajjappalavara and Dharmatt
(2008), noticed that the segregation of population to
the inheritance of heat tolerance was 3 (tolerance): 1
(susceptible) ratio and suggested single gene
inheritance for heat tolerance. Hannan et al
.
(2007)
and Signh et al
.
(2001) had also observed some
tomato genotypes with good general combining ability
in number of flower clusters, plant height at 60 days
after transplanting and number of fruits per plant. This
study has identified potentials genotypes with high
level of agronomic character because of the
appreciable level of heterosis observed. Both positive
and negative heterotic values were recorded from all
the character under study. The reseasonabe
positive heterosis over higher parents recorded by
Currant x RioGrandei for plant height is an indication
of tall plant. Negative higher parents heterosis
recorded by Cherry x RioGrandei is an indication
of short plant. The cross, Curran t x GoldenRoma
also recorded positive higher parents heterotic values
for weight of fruits which indicates excellent yield.
However, it does not always follow that high mean
performance of crosses imply high heterosis of such
crosses. Sometime such performance may be as a
result of luxuriant growth; this is the same with
positive heterosis recorded by Currant x
RioGrandei for plant height. This is similar to work of
Tadese et al (2008). Though heterosis is minimal in
self pollinated plant as reported by Romeo (1990).
Hannan et al (2007) had observed positive higher
parent heterosis in some tomato crosses with respect
to number of leaves and plant height. All the crosses
recorded negative heterosis over higher parents for
percentage damaged fruits. This is desirable because it
indicates high level of heat tolerance. These crosses
therefore, had good tolerance to heat than their higher
parents. Negative heterosis over parents recorded by
crosses such as Currant x UC28B, Cherry x Romavf
and Currant x Romavf for numbers of days to final
harvest is an indication of earliness.
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