Heterosis and Combining Ability for Productivity Related Traits in Tomato (Solanum lycopersicum L.)
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Date
2011
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UAS, Dharwad
Abstract
The investigation was conducted to assess the heterosis and combining ability
for productivity and bacterial wilt resistance in tomato during 2009-10 in the
Department of Horticulture, UAS, Dharwad. The experimental material consisted of
fourteen parents including five female and nine male parents. Forty five F1 hybrids
were produced in a line × tester mating design for heterosis and combining ability
studies. Female parents were selected with diversity for bacterial wilt and male
parents with diversity for horticultural traits. Hybrids showed significant differences
for all the characters studied except pH of the fruit juice. Significant per se
performance and economic heterosis in desirable direction was recorded in several
crosses. The crosses DMT-1 × Arka Alok, DMT-1 × DMT-2 and DM-3 × DMT-2
expressed significant heterosis over commercial check (Ruchi) for economic
characters like yield per plant and bacterial wilt resistance. When the analysis of
variance for combining ability with respect to yield was looked into, it revealed that
line x tester contribution was higher than that of lines and testers contribution
individually. Among lines, DMT-1 was good general combiner and among testers,
DMT-2 was good general combiner. Here SCA variance was greater than GCA
indicating the predominance of non-additive gene action. DMT-1 × Arka Alok, DMT-
1 × DMT-2 and DM-3 × DMT-2 crosses had significant SCA effects for yield per
plant. DM-3 × DS-1 and DM-5 × IMP-B were suitable for processing. The present
study reveals that heterosis breeding is useful for development of tomato through
exploitation of non-additive gene action.
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Horticulture