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Heterosis and combining ability for resistance against tospovirus in tomato (Solanum lycopersicum Mill.) Wettd"

KrishiKosh

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Title Heterosis and combining ability for resistance against tospovirus in tomato (Solanum lycopersicum Mill.) Wettd"
 
Creator K.H.Yashwanta Kumar
 
Contributor Satish S.Patil
 
Subject Horticulture
 
Description The investigation was conducted to asses the genetic diversity, magnitude of heterosis
and combining ability for Tospovirus resistance, yield and related traits of tomato during
2007-08 at Vegetable Block, Department of Horticulture, UAS, Dharwad. The experimental
material consisted of 70 genotypes for genetic divergence study. Twelve parents and thirty
six F1 hybrids were produced in a line x tester mating design for heterosis and combining
ability studies. Germplasm showed sufficient diversity for eleven characters as seven clusters
were obtained. Genotypes of cluster – VI showed least per cent TSWV symptom severity and
maximum fruit yield per plant and number of fruits per plant.
Hybrids showed significant differences for all the twelve characters. Significant per se
performance and economic heterosis in desirable direction was recorded in several crosses.
The crosses S-05 x BFL, S-61 x Arka Alok, S-61 x BFL and S-05 x DMT-1 were expressed
significant heterosis over commercial checks (Lakshmi and NS-585) for economic characters
like yield per plant and least symptom severity of TSWV.
When the analysis of variance for combining ability with respect to yield were looked
into, it revealed that line x tester contribution was higher than that of lines and testers
contribution individually. Here sca variance was greater than gca indicating the
predominance of non – additive gene action. S-61X BFL, S-05 x DMT and S-05 x BFL had
significant negative sca effects for TSWV symptom severity. Thus the foregoing discussion
reveals that heterosis breeding for development of tomato through exploitation of non -
additive gene action is the most practicable approach for developing tomato cultivar for
summer season.
 
Date 2016-10-27T16:40:56Z
2016-10-27T16:40:56Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/82608
 
Format application/pdf
 
Publisher UAS, Dharwad