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...
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1996
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my-upm-ir.103792011-03-30T03:24:44Z Genetic studies of bacterial wilt resistance and agronomic characters, and yield component analysis in tomato 1996 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. Tomatoes - Diseases and pests Tomatoes 1996 Thesis http://psasir.upm.edu.my/id/eprint/10379/ http://psasir.upm.edu.my/id/eprint/10379/1/FP_1996_10_A.pdf application/pdf en public masters Universiti Pertanian Malaysia Tomatoes - Diseases and pests Tomatoes Faculty of Agriculture English |
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Universiti Putra Malaysia |
| collection |
PSAS Institutional Repository |
| language |
English English |
| topic |
Tomatoes - Diseases and pests Tomatoes |
| spellingShingle |
Tomatoes - Diseases and pests Tomatoes Abdalla, Saad Osman Genetic studies of bacterial wilt resistance and agronomic characters, and yield component analysis in tomato |
| 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 |
| qualification_level |
Master's degree |
| author |
Abdalla, Saad Osman |
| 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 |
| granting_institution |
Universiti Pertanian Malaysia |
| granting_department |
Faculty of Agriculture |
| publishDate |
1996 |
| url |
http://psasir.upm.edu.my/id/eprint/10379/1/FP_1996_10_A.pdf |
| _version_ |
1747811108892180480 |