Estimation of Combining Ability and Hetrosis in snakeground
By: Radhika V S.
Contributor(s): Abdul Khader K M (Guide).
Material type:
BookPublisher: Vellayani Department of Plant Breeding and Genetics, College of Agriculture 1999DDC classification: 630.28 Online resources: Click here to access online Dissertation note: MSc Abstract: A diallel analysis in snakegourd iTrichosanthes anguina. L.) was carried out
in the Department of Plant Breeding and Genetics, College of Agriculture, Vellayani
during the period 1997-1999. The research work was taken up to assess the general
and specific combining abilities, nature of gene action and also to estimate the
heterosis for various characters. The six parents involved were selected from a
previous D2 analysis conducted in the Department and were the most divergent ones.
They are PI (Nedumangad local), P2 (Thrikkannapuram local), P3 (Kanhangad local -
3), P4 (Vlathankara local), Ps (Kaumudi) and P6 (Idukki local). The observations were
recorded on yield and yield attributing characters.
Significant differences were detected among the mean performance of the
genotypes, for all the characters studied. The combining ability analysis revealed that
the parent P, (Kaumudi) was the best general combiner for most of the yield and and
yield contributing traits. The hybrids PI x Ps, P2 X P, and P2 x P6 were superior
specific combiners in yield characters like mean weight of fruit, number of fruits per
plant and fruit yield per plant respectively. The crosses involving P, and P6 were
found to be good specific combiners for yield and yield contributing characters.
The variance due to general and specific combining ability was significant in
almost all the characters studied indicating the significance of both additive and non
additive gene action in the characters. The sea variance was found to be more than
gca variance in most of the characters studied indicating the predominance of non
additive gene action. The ratio of additive to dominance variance was less than one in
most of the characters again indicating the predominant influence of non additive
gene action which strongly substantiated the validity of the heterosis breeding method
in improving the crop.
Manifestation of heterosis was seen for all the characters studied. Among the
hybrids, P2 x Ps had the maximum standard heterosis for yield and yield related
characters. The crosses PI x Ps, P, X P(, and P3 x P, also exhibited significant standard
heterosis for these characters. In general the hybrids involving the parent Ps was
found to be more heterotic.
| Item type | Current location | Call number | Status | Date due | Barcode |
|---|---|---|---|---|---|
Theses
|
KAU Central Library, Thrissur Theses | 630.28 RAD/ES (Browse shelf) | Available | 171613 |
MSc
A diallel analysis in snakegourd iTrichosanthes anguina. L.) was carried out
in the Department of Plant Breeding and Genetics, College of Agriculture, Vellayani
during the period 1997-1999. The research work was taken up to assess the general
and specific combining abilities, nature of gene action and also to estimate the
heterosis for various characters. The six parents involved were selected from a
previous D2 analysis conducted in the Department and were the most divergent ones.
They are PI (Nedumangad local), P2 (Thrikkannapuram local), P3 (Kanhangad local -
3), P4 (Vlathankara local), Ps (Kaumudi) and P6 (Idukki local). The observations were
recorded on yield and yield attributing characters.
Significant differences were detected among the mean performance of the
genotypes, for all the characters studied. The combining ability analysis revealed that
the parent P, (Kaumudi) was the best general combiner for most of the yield and and
yield contributing traits. The hybrids PI x Ps, P2 X P, and P2 x P6 were superior
specific combiners in yield characters like mean weight of fruit, number of fruits per
plant and fruit yield per plant respectively. The crosses involving P, and P6 were
found to be good specific combiners for yield and yield contributing characters.
The variance due to general and specific combining ability was significant in
almost all the characters studied indicating the significance of both additive and non
additive gene action in the characters. The sea variance was found to be more than
gca variance in most of the characters studied indicating the predominance of non
additive gene action. The ratio of additive to dominance variance was less than one in
most of the characters again indicating the predominant influence of non additive
gene action which strongly substantiated the validity of the heterosis breeding method
in improving the crop.
Manifestation of heterosis was seen for all the characters studied. Among the
hybrids, P2 x Ps had the maximum standard heterosis for yield and yield related
characters. The crosses PI x Ps, P, X P(, and P3 x P, also exhibited significant standard
heterosis for these characters. In general the hybrids involving the parent Ps was
found to be more heterotic.
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