Line X Tester Analysis for Yield, Yield Attributing Characters and Bacterial with Disease Resistance in Tomato (Solanum lycopersicum Mill.)
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Date
2011
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UAS, Dharwad
Abstract
A field experiment was conducted to study heterosis and combining ability for
yield and yield contributing traits and inheritance pattern of bacterial will resistance in
tomato (Solanum lycopersicon Mill.). The experiment was conducted at Agriculture
College, University of Agricultural Sciences, Dharwad. Forty-two crosses were
developed by crossing three females with fourteen males following line x tester
design.
Variance due to the parents and crosses were found significant for all the yield
and yield related components, except number of branches and fruit diameter for
crosses. The line x tester analysis revealed that no single line or tester is superior for
all the traits under consideration. Nevertheless, male parent CLN2777A exhibited
high per se performance for plant height, number of branches per plant, average fruit
weight and pericarp thickness, while CLN2123E exhibited highest per se performance
for total fruit yield per plant. Maximum standard heterosis for total yield per plant was
observed in the cross Pusa Ruby x CLN2777A followed by Megha x CLN2768A and
Megha x CLN2777F. While the hybrid Megha x CLN2777F showed significant
standard heterosis for plant height, number of branches, number of fruits per plant,
fruit length, fruit weight and pericarp thickness. The cross Megha x CLN2768A
exhibited significant sca effect for fruit yield traits like total fruit yield per plant, days
to 50 per cent flowering, number of fruits per plant and fruit quality traits like fruit
length, TSS and ascorbic acid. It also exhibited recorded standard heterosis over all
three checks Namdhari 2535, Maharani and MHTM-256 for total fruit yield per plant,
while Megha x CLN2777F recorded significant sca effect for fruit length and ascorbic
acid content. All the potential lines used for screening were identified as resistant to
bacterial wilt while all testers Pusa Ruby, Megha and DMT-2 were found to be
susceptible. Two F2 populations Pusa Ruby x CLN2777A and Pusa Ruby x
CLN2400B used for screening resistance for bacterial wilt exhibited 15:1 ratio
indicating resistance to bacterial wilt is governed by two duplicate genes.
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Keywords
Genetics and Plant Breeding