PRODUCTION AND EVALUATION OF THE TOMATO FOR BACTERIAL WILT AND EXTENDED SHELF-LIFE
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Date
2017-08-24
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Tomato is an important vegetable crop grown in India and throughout the world.
Stable genotype for fruit quality and yield parameter is first and foremost prerequisite for
commercialization. Bacterial wilt disease caused by Ralstonia solanacearum is one
among serious bacterial diseases that affects tomato production up to 90 %. Hence the
present investigation was aimed to identify the stable genotypes in terms of fruit quality
and yield aspects and further to improve for bacterial wilt resistance with the help of
DNA Markers. Thirty recombinant inbred lines along with three checks were evaluated in
all the three environments, with respect to total yield per plant and fruit shelf life. The
genotypes code-33, 26 and 24 were identified as stable genotypes. In another
experimental trial, fifty-seven genotypes including stable RILs were evaluated for
bacterial wilt. Two hundred tomato hybrids were developed in different combinations
and tested against Bacterial Wilt (Ralstonia solanacearum) along with parents and two
commercial checks. Out of two hundred hybrids, highly resistant reaction was observed
in twenty-seven hybrids, moderately resistant reaction recorded in one hundred and
thirty-four hybrids and susceptible reaction recorded in forty-one hybrids. Two hybrids
RIL-169 × EC802390 and IC 39457 × EC 802390 were selected and one hundred and
sixty-five lines of each cross RIL 169 × EC802390 and IC39457 × EC802390 were
evaluated for bacterial wilt incidence. The cross between RIL 169 × EC802390, Thirtysix
progenies have shown resistance reaction, eighty-two progenies were moderately
resistant and forty-seven progenies were found to be susceptible to bacterial wilt. In
another cross, IC39457 × EC802390, forty progenies were resistant, seventy-eight
progenies were moderately resistant and forty-seven progenies were found to be
susceptible. Out of fifty-one DNA Markers; one SCAR marker SCU176-534 linked with
bacterial wilt resistance could identify the plants with bacterial wilt resistance loci in both
the F2 populations.
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