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Assessment of genetic potential of exotic tomato [(Solanum lycopersicum Mill.) Wetted] breeding lines for yield and disease resistance

KrishiKosh

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Title Assessment of genetic potential of exotic tomato [(Solanum lycopersicum Mill.) Wetted] breeding lines for yield and disease resistance
 
Creator Katkar Gajanan.Dattatray
 
Contributor O.Sridevi
 
Subject Genetics and Plant Breeding
 
Description Tomato [(Solanum lycopersicum Mill.) Wetted] is one of the most important
vegetable crops grown in India. However, modern cultivars of tomato have a limited genetic
diversity and demand for high yielding disease resistant hybrids is alarming. With this
outlook an effort was made to increase genetic variability and breeding for ToLCV resistant
hybrids by utilizing more diverse exotic tomato breeding lines.
Diversity analysis among 19 exotic tomato breeding lines and cultivars viz., Pusa-
Ruby, Vaibhav and Arka-Vikas was made through the D2 analysis, PCA, RAPD markers and
SRAP markers, which revealed that almost all exotic breeding lines are generally diverse
from cultivated varieties. Hence, utilization of exotic breeding lines could be worthy to
increase new gene and breeding for hybrid vigour.
Ninteen exotic tomato breeding lines and cultivars viz., Pusa-Rupy, Vaibhav and
Arka-Vikas were crossed in line x tester design to assess the combining ability and heterosis.
A perusal of the results indicated that the tomato lines PT4722A, CLN2777C, CLN2460E,
CLN2498D, CLN2123C and Vaibhav showed highest GCA effects for most of the characters
and lines viz., CLN2545A, CLN2777A, CLN2123C, CLN2123D, PT4722A and tester
Vaibhav found to be resistant for ToLCV. The hybrid, Arka-Vikas x CLN2123E showed
maximum SCA effect for yield and its contributing characters as well as fruit quality
characters, followed by Vaibhav x PT4722A. While, hybrids Pusa-Ruby x CLN2545A,
Vaibhav x CLN2498E, Vaibhav x CLN2768A and Vaibhav x CLN2460E showed resistance
to ToLCV.
The hybrids Vaibhav x PT4227A, Arka-Vikas x CLN2123E, Vaibhav x CLN2768A,
Vaibhav x CLN2777F, Vaibhav x CLN2400B, Arka-Vikas x CLN2460E, Arka-Vikas x
CLN2777B, Pusa-Ruby x CLN2498E and Pusa-Ruby x CLN2777F showed significant
heterosis over the best check hybrids. The identified superior breeding lines and hybrids may
be cultivated further for confirmation of their superiority across seasons and locations as well
as utilized in future breeding programme.
 
Date 2016-11-07T18:43:12Z
2016-11-07T18:43:12Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/84306
 
Format application/pdf
 
Publisher UAS, Dharwad