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Studies on Hybrid Performance, Heterosis and Combining Ability Under Organic and Inorganic Farming Systems in Tomato (Solanum Lycopersicum L.)

CSK Himachal Pradesh Agricultural University Repository

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Title Studies on Hybrid Performance, Heterosis and Combining Ability Under Organic and Inorganic Farming Systems in Tomato (Solanum Lycopersicum L.)
 
Creator Thakur, Nisha
 
Subject 635.642 Tomatoes
 
Description 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 xE 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 xBWR-5, Palam Pride xBWR-5, Palam Pride x 12-1 and Hawaii 7998 x 12-1 under organic conditions and 12-1 xBWR-5, CLN 2070 x 12-1, CLN 2070 xHawaii 7998, Hawaii 7998 x 12-1 and Hawaii 7998 x 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 xBWR-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.
 
Date 2014
 
Type Thesis
NonPeerReviewed
 
Format text
 
Language en
 
Identifier http://hillagricrepository.co.in/852/1/NISHA%20THAUR%20PhD%20Veg_.pdf
Thakur, Nisha (2014) Studies on Hybrid Performance, Heterosis and Combining Ability Under Organic and Inorganic Farming Systems in Tomato (Solanum Lycopersicum L.). PhD thesis thesis, CSKHPKV Palampur.