GENETIC ANALYSIS FOR FRUIT YIELD AND YIELD COMPONENTS AND TAGGING TRAITS RELATED TO WATER USE EFFICIENCY IN TOMATO (Solanum spp.)
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Date
2018-12-07
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UNIVERSITY OF AGRICULTURAL SCIENCES, GKVK BENGALURU
Abstract
The present investigation was carried out to assess the variability and diversity for
traits to water use efficiency and fruit yield in tomato germplasm during 2013 at GKVK,
UAS, Bengaluru. The study revealed moderate to high PCV and GCV in most of the
traits studied. K-mean cluster analysis revealed high level of morphological diversity as
indicated by diverse clusters which is informative for breeding programs. Drought
tolerance analysis identified MP, GMP, HAM and STI as more effective indices and EC
677068, EC 608271, EC 676792, EC 586980 and EC 676783 as most drought tolerant
accessions. Further, twelve inter-specific hybrids developed from seven parents selected
on basis of SCMR, SLA and Δ
13C were evaluated in RCB design during Kharif 2014.
The parents EC 771612 and LA 2567 and crosses VRCT 174 × EC 519100, EC 771597 ×
EC 771612 × LA 2657 recorded significant gca and sca effects for most of traits related
to WUE and fruit yield respectively.
Moderate to high coefficient of variability was noticed in F2 and F3 populations of
cross EC S. lycopersicum cv. EC 771612 × S. pennellii cv. LA 2567 and positive
platykurtic skewed distribution indicating dominance based complementary gene
interaction in the inheritance of traits studied. Five generations of the cross EC 661257 ×
LA 2657 revealed additive gene effect (d) and presence of duplicate dominant epistasis in
all the traits except specific leaf area. Out of 212 SSRs surveyed for polymorphism only
24 were found to be polymorphic between the parents and were used in Bulk segregant
analysis. SSR 19 and SSR 218 showed putatively linkage to SCMR and SLA
respectively, can be used for selection of high water use efficient genotypes.