COMBINING ABILITY STUDIES IN TOMATO (SOLANUM LYCOPERSICUM L.) FOR YIELD, QUALITY AND BACTERIAL WILT RESISTANCEJyothi Kattegoudar , H. B. Lingaiah, Mamatha N.C. and Arunkumar. B.
Investigation on Combining ability studies in tomato (Solanum lycopersicum L.) for yield, quality and bacterial wilt resistance was done by using full diallel analysis involving four bacterial wilt resistance genotypes and four bacterial wilt susceptible genotypes having good horticultural properties. The results 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 and bacterial wilt resistance. PKM-1 and Anagha showed superiority for most of the yield attributing traits. Anagha has shown superiority for both yield and bacterial wilt resistance. Gene pool developed by intermating in the segregating population inviting the parents to offer maximum promise in genetically enhancing yield as well as bacterial wilt resistance. Good quality should be coupled with the yield for fetching better market price. For number of locules and total soluble solids, the hybrid Arka Saurabh x Anagha showed the highest positive significant sca effect. PKM-1 x Utkal Raja for pericarp thickness, showed positive significant sca effects. These hybrids are combinations of positive x negative gca effect. Thus it gives clear evidence that these quality characters are governed by non-additive gene action. For improving quality traits, heterosis breeding is the best approach as there was more non-additivity.
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