HETEROSIS AND COMBINING ABILITY ANALYSIS FOR PRODUCTIVITY AND ITS RELATED TRAITS IN TOMATO (Solanum lycopersicum L.)

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Date
2015-06
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VEGETABLE SCIENCE DEPT., ASPEE COLLEGE OF HORTICULTURE AND FORESTRY, NAVSARI AGRICULTURAL UNIVERSITY, NAVSARI
Abstract
In the present investigation, information on magnitude of heterosis and combining ability were obtained for marketable fruit yield and its related components adopting full diallel analysis involving six diverse parents and its resultant 30 hybrids of tomato, tested at Regional Horticultural Research Station, Navsari Agricultural University, Navsari during late kharif, 2014 in a randomized block design with three replications. The analysis of variance indicated significant differences among parents and hybrids for the most of the characters indicating presence of genetic variability in the material under studied. Significant to highly significant positive standard heterosis was for marketable fruit yield and its component characters in the crosses involving elite line as the parents suggested that there is a good scope for exploiting heterosis commercially and also possibility of isolating desirable Abstract segregates. The cross combinations viz., AVTO-2 x JTL-08- 15, NTL-1 x JTL-08-15, NTL-1 x AVTO-2 and AVTO-2 x NTL-50 showed highly significant standard heterosis in positive direction for marketable fruit yield in tomato. Combining ability analysis revealed that both additive and non-additive variances were significant for marketable fruit yield and its related traits indicating their improvements in the expression of various traits. The magnitude of non- additive variance was higher for marketable fruit yield and its contributing traits indicating predominant role of non-additive gene action in the inheritance of the traits. The estimates of GCA indicates that AVTO-2 and NTL-50 were good general combiners for fruit girth, average fruit weight, number of marketable fruits per plant, TSS, lycopene content and marketable fruit yield per plant. The cross AVTO-2 x JTL-08-15 was showed high heterosis, best specific combiner and per se performance for fruit yield and its related component in tomato included at least one parent with high GCA effect.
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