INHERITANCE OF BACTERIAL WILT RESISTANCE IN TOMATO (Solanum lycopersicum L.)INHERITANCE OF BACTERIAL WILT RESISTANCE IN TOMATO (Solanum lycopersicum L.)
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Date
2015-03
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University of Horticultural Sciences, Bagalkot
Abstract
Investigation on “Inheritance of bacterial wilt resistance in tomato (Solanum lycopersicum L.)” was undertaken during the year 2011-2013 at College of Horticulture, University of Horticultural Sciences Campus, GKVK, Bengaluru. Full diallel analysis involving four bacterial wilt resistance genotypes namely Arka Abha, Utkal Pragnya, Anagha and Utkal Raja and four bacterial wilt susceptible genotypes having good horticultural properties viz., Arka Meghali, Arka Saurabha, PKM-1 and Vaibhav revealed highly significant differences among tomato genotypes and crosses for all observed characters. Significant mean squares for general combining ability (GCA), specific combining ability (SCA) and reciprocal combining ability indicated joint role of additive, non-additive and maternal effects for the expression of plant height, number of branches per plant, days to 50 per cent flowering, number of flowers per clusters, average fruit weight, yield per plant, number of locules per fruit, TSS, titratable acidity, ascorbic acid and bacterial wilt resistance. Heterosis study revealed that the best performing crosses were Vaibhav x PKM-1, PKM-1 x Anagha for high yield per plant. These ccombinations involved both parents with high gca effect indicating involvement of more additive gene effect in their heterotic performance. For average fruit weight, Vaibhav x Arka Saurabh and Vaibhav x PKM-1 performed the best. For bacterial wilt resistance, the proportion of wilt-resistant in F1 's was generally higher when both parents were resistant compared to resistant x susceptible crosses. However, in some crosses with one susceptible parent, the resistance was comparable to the highly resistant stocks viz.,Vaibhav x Utkal Raja and Utkal Pragnya x Vaibhav indicating non-additive action. These combinations of positive x negative general combiners shows that these characters are governed by non-additive gene action. Further in inheritance study, segregation pattern of BC1, BC2 and F2 showed that, resistance to bacterial wilt in Vaibhav x Anagha and Anaga x PKM-1 crosses governed by single dominant gene.
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