Line x tester analysis in tomato (Solanum lycopersicum L.)
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Date
2013-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present investigation was carried out at Vegetable Research Centre (VRC), G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand during Spring- summer season of 2012 and 2013. The major objectives of the study were to know the extent of heterosis, combining ability and various genetic parameters in tomato. Thirty crosses were evolved in a line x tester mating design with 10 genotypes as female parents (lines) and 3 genotypes as male parents (testers). The hybrids, PT-2007-09 x Pant Bahar and PT-2009-08 x Arka Vikas were most promising for earliness exhibiting highest negative heterosis. With respect to plant height, hybrids, PT-7 x PT-3 and PT-2009-08 x PT-3 were most promising for tallness and dwarfness, respectively. Hybrid combination, S-108 x PT-3 exhibited most promising results with respect to heterosis for fruit yield per plant and total soluble solids. Most promising hybrid for number of locules was PT-42 x Arka Vikas which exhibited negative heterosis. The best hybrids with respect to heterosis were S-108 x Arka Vikas for average fruit weight, PT-18 x PT-3 for fruit yield per hectare, PT-18 x Arka Vikas for number of fruits per plant, PT-8 x PT-3 for number of seeds per gram, PT-8 x Arka Vikas for
pericarp thickness, PT-42 x Arka Vikas for number of locules, PT-18 x Arka Vikas for
fruit length and fruit width, and PT-8 x Arka Vikas for fruit shape index. The most promising general combiners were S-108 for plant height (negative gca), fruit yield per hectare, fruit yield per plant, average fruit weight, TSS at red ripe stage and number of seeds per gram, PT-18 for plant height (positive gca) and number of fruits per plant, PT-8 for days to last harvest and pericarp thickness, PT-12 for number of seeds per gram and fruit length, PT-2009-08 for TSS at immature stage and turning stage, PT-7 for number of branches per plant, PT-2009-10 for number of locules, S-03-05 for fruit width, and PT-42 and PT-2009-08 for fruit shape index. Most promising hybrids exhibiting significant sca effects were, PT-2007-09 x Arka Vikas for fruit yield per hectare and average fruit weight, S-03-05 x PT-3 for dwarfness and TSS, PT-2007-09 x Pant Bahar for tallness, PT-7 x Arka Vikas for earliness and reduced number of seeds per gram, S-108 x Pant Bahar for number of fruits per plant, PT-18 x Arka Vikas for number of locules and PT-2009-08 x Arka Vikas for pericarp thickness. The combining ability analysis indicated the importance of both additive and non-additive gene action for different growth, yield and fruit quality characters.
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Thesis-PhD
Keywords
line x tester analysis, tomatoes, vegetables, genetic parameters, combining ability, heterosis, genotypes, crosses