THESIS

2.3 Morphological characters
The morphological characters of F1 compare to their parents are shown in
Figure 19 to 32. From the morphological observation of F1 hybrid plants derived from
S. melongena x S. melongena, the F1 hybrid plants obtained from these crosses grew
vigorously and fertile. Their plant size, leaf size, flowering time, fruit size and fruit
color characters are intermediate to their parents. This indicates that these characters
are controlled by additive genes (Seehalak, 2005). Similar the hybrid plants were
obtained from rescuing the embryos of S. melongena and S. torvum, the
morphological characters of F1 hybrids when compared to their parents are present in
Figure 20. Plant hieght, plant breadth, leaf blade length, leaf blade width and
flowering time of F1 hybrid plants are intermediate between their parents. Especially,
the leaf blade and flower of F1 hybrids are similar to S. torvum but the number of
flowere per inflorescence is less than S. torvum. This indicates that the interspecific
hybrids between S. melongena x S. torvum are true hybrids.
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The hybrids plant between S. moleongena x S. americanum (Figure 21), S.
moleongena x S. villosum (Figure 22) and S. moleongena x S. nigrum (Figure 23), are
not true hybrids due to all morphological characters such as plant habit, leaf shape,
leaf size and flower exhibited like S. melongena.
The crossing within S. americanum from S00861 x S00865 (Figure 24),
the hybrid plant is low vigor than their parents. Hybrid plant show very low viogor in
plant height. According to Bhaduri (1951) who concluded that the hybridization and
selection accompanied by gene mutation and segmental interchange of chromosome is
the cytogenetical basis of origin of the non-tuberous species complex of Solanum.
However, the hybrids plants between S. americanum x S. villosum
(S00861 x S00860) show the intermediate morphological characters when compared
to their parents (Figure 25). This indicates that it is a true hybrid.