STUDIES ON HYBRID PERFOERMANCE, HETEROSIS AND COMBINING ABILITY UNDER ORGANIC AND INORGANIC FARMING SYSTEMS IN TOMATO (Solanum lycopersicum L.)
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Date
2014
Authors
Journal Title
Journal ISSN
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Publisher
CSK Himachal Pradesh Krishi Vishavavidyalaya, Palampur
Abstract
Tomato (Solanum lycopersicum L.) cultivation in commercial growing pockets of Himachal Pradesh
is severely affected due to bacterial wilt disease (caused by Ralstonia solanacearum). Being safe and better in
quality, the demand for organic tomatoes is increasing day by day, for which high yielding organic input
responsive varieties/hybrids with more pest tolerance/resistance are required. Keeping these points in view, the
present investigation was undertaken to estimate the extent of per se performance and heterosis, to work out the
nature and magnitude of gene action and to identify potential parental lines and cross combinations on the basis of
combining ability under organic and inorganic farming systems. Eight diverse genotypes viz., CLN 2070, CLN
2123 A-1 (red), Hawaii 7998, Palam Pride, 12-1, BWR-5, Arka Abha and Arka Meghali and their 28 cross
combinations developed in half diallel mating design were evaluated alongwith standard check Avtar (7711) in
bacterial wilt sick plots in RBD with three replications under organic and inorganic farming system during
summer-rainy seasons of 2012 and 2013. The analyses of variances indicated significant differences among
genotypes (G) for marketable yield and other component traits in all the environments. Also, significant
differences for environment (E) and G × E interaction for most of the traits indicated a definite role of
environment on the performance of genotypes/crosses. Most of the hybrids and parents showed 100 per cent plant
survival. Variances due to GCA, SCA and their interaction with environment were significant for most of the
traits under organic and inorganic farming conditions, indicating the importance of testing parents as well as
hybrids across environments. On the basis of per se performance, heterosis and combining ability for marketable
fruit yield, component traits, the cross combinations viz., 12-1 × BWR-5, Palam Pride × BWR-5, Palam Pride ×
12-1 and Hawaii 7998 × 12-1 under organic conditions and 12-1 × BWR-5, CLN 2070 × 12-1, CLN 2070 ×
Hawaii 7998, Hawaii 7998 × 12-1 and Hawaii 7998 × BWR-5 under inorganic conditions were the most
promising and surpassed the standard check (Avtar). These hybrids were also resistant to bacterial wilt and can be
further exploited. Overall, 12-1 × BWR-5 was the most promising cross combination among the top hybrids under
organic and inorganic farming conditions. Hawaii 7998, 12-1 and BWR-5 were the most promising general
combiners under organic and inorganic farming conditions. For most of the traits important from commercial
point of view, there was preponderance of non-additive gene action which reaffirms the importance of hybrids in
tomato. There was differential response of different genotypes to organic and inorganic farming conditions. This
necessitates the separate breeding programme to identify potential genotypes responsive to organic and inorganic
farming conditions.
Description
Doctoral Dissertation
Keywords
##Unable to generate tags d8006.pdf, Tomato, ##Unable to generate tags d8006.pdf, Vegetable Science