This study was conducted in a green house at the Faculty of Agriculture
Sana'a University, during 2000-2001 and 2002 growing season. The objective
of the study was to obtain a genetic information on total soluble solids in the
tomato fruits in ord
er to estimate the gene action effects, which control
inheritance, heterosis, degree of dominance and heritability in term of broad
sense and narrow sense, as will as, reduction inbreeding depression in F2, for
understanding the suitable method for genetic improvement of quality.
Two tomato cultivars were used for genetic screening and cross breeding for
F1 hybrid production. F1 was cross bred with the parents for getting back cross
P1 and P2. Also, F2 was obtained. The results revealed, the heterosis in F1 based
on average of mid parents was 7.94% as compared with average of higher
parents (-2.21%). The degree of dominance was less than 1.0, which indicate
partial dominance, additive gene action variance was higher than the non
additive gene action variance which reflected on the narrow sense heritability
(h2 n.s), that reached 81.37%. The reduction in inbreeding depression in F2
reached 15.82%. The overall results indicated that, selection and hybridization
methods seem to be a good method for improving quality of total soluble solids
in tomato.
