Cover Image

Genetic studies of bacterial wilt resistance and agronomic characters, and yield component analysis in tomato

Experiments were conducted to evaluate the inheritance and performance of six tomato parental lines (varieties) and their respective cross combinations. Inheritance of bacterial wilt resistance was evaluated in the greenhouse (screening experiment), while assessments of twelve agronomic characte...

Full description

Saved in:
Bibliographic Details
Main Author: Abdalla, Saad Osman
Format: Thesis
Language:English
English
Published: 1996
Online Access:http://psasir.upm.edu.my/id/eprint/10379/1/FP_1996_10_A.pdf
http://psasir.upm.edu.my/id/eprint/10379/
Tags: Add Tag
No Tags, Be the first to tag this record!
id my.upm.eprints.10379
record_format eprints
spelling my.upm.eprints.103792011-03-30T03:24:44Z http://psasir.upm.edu.my/id/eprint/10379/ Genetic studies of bacterial wilt resistance and agronomic characters, and yield component analysis in tomato Abdalla, Saad Osman Experiments were conducted to evaluate the inheritance and performance of six tomato parental lines (varieties) and their respective cross combinations. Inheritance of bacterial wilt resistance was evaluated in the greenhouse (screening experiment), while assessments of twelve agronomic characters were made under hydroponic conditions. Greenhouse inoculation studies indicated that, parents have different degree of susceptibility to bacterial wilt. There were significant differences (P = 0.01) among genotypes as indicated by their disease index. Studies carried out under hydroponic conditions showed that except for the number of branches per plant and stem diameter, there were significant differences (P = 0.01) among the means of all the characters studied. Different degree of heterosis have been expressed for different characters. For the three populations studied. resistance to bacterial wilt showed high heterosis over mid parental value and no heterosis over better parental value. On the other hand. for most of the agronomic characters in the five populations studied. a majority showed heterosis over better parent, but their values were not high. However. mid parental heterosis values were mostly high. Heritability estimates were generally high for most characters including disease index. This indicated that the additive genes were more important than non-additive genes. Yield characters (viz. number of fruits per plant, average weight per fruit and fruit diameter) were highly and positively correlated with each other. Maturity characters (days to flowering and days to first harvest) were in general negatively correlated with yield. The path coefficient analysis revealed that the number of fruits per plant, average weight per fruit, and fruit diameter were the most important characters that contributed directly to the yield. Therefore. in any breeding programme selection for disease resistant plants (genotypes) after each generation of selfing should also take into consideration other desirable agronomic characters. 1996 Thesis NonPeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/10379/1/FP_1996_10_A.pdf Abdalla, Saad Osman (1996) Genetic studies of bacterial wilt resistance and agronomic characters, and yield component analysis in tomato. Masters thesis, Universiti Pertanian Malaysia. English
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
English
description Experiments were conducted to evaluate the inheritance and performance of six tomato parental lines (varieties) and their respective cross combinations. Inheritance of bacterial wilt resistance was evaluated in the greenhouse (screening experiment), while assessments of twelve agronomic characters were made under hydroponic conditions. Greenhouse inoculation studies indicated that, parents have different degree of susceptibility to bacterial wilt. There were significant differences (P = 0.01) among genotypes as indicated by their disease index. Studies carried out under hydroponic conditions showed that except for the number of branches per plant and stem diameter, there were significant differences (P = 0.01) among the means of all the characters studied. Different degree of heterosis have been expressed for different characters. For the three populations studied. resistance to bacterial wilt showed high heterosis over mid parental value and no heterosis over better parental value. On the other hand. for most of the agronomic characters in the five populations studied. a majority showed heterosis over better parent, but their values were not high. However. mid parental heterosis values were mostly high. Heritability estimates were generally high for most characters including disease index. This indicated that the additive genes were more important than non-additive genes. Yield characters (viz. number of fruits per plant, average weight per fruit and fruit diameter) were highly and positively correlated with each other. Maturity characters (days to flowering and days to first harvest) were in general negatively correlated with yield. The path coefficient analysis revealed that the number of fruits per plant, average weight per fruit, and fruit diameter were the most important characters that contributed directly to the yield. Therefore. in any breeding programme selection for disease resistant plants (genotypes) after each generation of selfing should also take into consideration other desirable agronomic characters.
format Thesis
author Abdalla, Saad Osman
spellingShingle Abdalla, Saad Osman
Genetic studies of bacterial wilt resistance and agronomic characters, and yield component analysis in tomato
author_facet Abdalla, Saad Osman
author_sort Abdalla, Saad Osman
title Genetic studies of bacterial wilt resistance and agronomic characters, and yield component analysis in tomato
title_short Genetic studies of bacterial wilt resistance and agronomic characters, and yield component analysis in tomato
title_full Genetic studies of bacterial wilt resistance and agronomic characters, and yield component analysis in tomato
title_fullStr Genetic studies of bacterial wilt resistance and agronomic characters, and yield component analysis in tomato
title_full_unstemmed Genetic studies of bacterial wilt resistance and agronomic characters, and yield component analysis in tomato
title_sort genetic studies of bacterial wilt resistance and agronomic characters, and yield component analysis in tomato
publishDate 1996
url http://psasir.upm.edu.my/id/eprint/10379/1/FP_1996_10_A.pdf
http://psasir.upm.edu.my/id/eprint/10379/
_version_ 1643824586766155776
score 13.211869

Similar Items