Heterosis and combining ability for resistance against tospovirus in tomato (Solanum lycopersicum Mill.) Wettd"
KrishiKosh
View Archive InfoField | Value | |
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
|
|