Estimation of Genetic Parameters from Specific Crosses of Cocoa (Theobroma Cacao L.)
By: Sridevi R.
Contributor(s): Prasanna Kumari Amma S(Guide).
Material type:
BookPublisher: Vellanikkara Department Of Plantation Crops And Spices,College Of Horticulture 1999DDC classification: 638.8 Online resources: Click here to access online Dissertation note: MSc Abstract: The research project entitled 'Estimation of genetic parameters from
specific crosses of cocoa (Theobroma cacao L.)' was carried outean ongoing
experiment of Cadbury-KAU Co-operative Cocoa Research Project (CCRP),
College of Horticulture, Kerala Agricultural University, Vellanikkara, Thrissur
during 1998-99. The studies were conducted in four year old hybrids. The major
objectives were to study the genetic variability, heritability, correlation of different
traits with yield, extent of heterotic expression of various traits and to examine the
association between seedling vigour and yield. Twenty five cocoa hybrids were
maintained in randomised block design with three replications.
The hybrids exhibited significant variability for most of the traits studied.
The estimates of pev were higher than gcv for all the traits studied. The highest
heritability was recorded for number of beans per pod and seedling vigour recorded
as °HD2 (6 MAS) had a high genetic gain. Yield and number of pods per tree
recorded moderate genetic gain.
Yield was found to be significantly and positively correlated with number
of pods per tree, height (2 YAP) and girth (2 YAP) of the tree. Absence of
significant correlation between yield and seedling vigour was observed. Path
analysis revealed the importance of pod number per tree and wet bean weight per
pod in determining yield.
Yield and number of pods per tree showed a very high heterotic
expression in most of the hybrids. Among the 25 cross combinations H23 was
identified as the superior cross combination followed by H16 and H; The parents of
these cross combinations can be used for raising biclonal seed gardens, as they had
a good specific combining ability.
The floral traits did not vary markedly in the hybrids. However the
qualitative traits exhibited wide variation in the different hybrids.
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KAU Central Library, Thrissur Theses | 638.8 SRI/ES (Browse shelf) | Available | 171573 |
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MSc
The research project entitled 'Estimation of genetic parameters from
specific crosses of cocoa (Theobroma cacao L.)' was carried outean ongoing
experiment of Cadbury-KAU Co-operative Cocoa Research Project (CCRP),
College of Horticulture, Kerala Agricultural University, Vellanikkara, Thrissur
during 1998-99. The studies were conducted in four year old hybrids. The major
objectives were to study the genetic variability, heritability, correlation of different
traits with yield, extent of heterotic expression of various traits and to examine the
association between seedling vigour and yield. Twenty five cocoa hybrids were
maintained in randomised block design with three replications.
The hybrids exhibited significant variability for most of the traits studied.
The estimates of pev were higher than gcv for all the traits studied. The highest
heritability was recorded for number of beans per pod and seedling vigour recorded
as °HD2 (6 MAS) had a high genetic gain. Yield and number of pods per tree
recorded moderate genetic gain.
Yield was found to be significantly and positively correlated with number
of pods per tree, height (2 YAP) and girth (2 YAP) of the tree. Absence of
significant correlation between yield and seedling vigour was observed. Path
analysis revealed the importance of pod number per tree and wet bean weight per
pod in determining yield.
Yield and number of pods per tree showed a very high heterotic
expression in most of the hybrids. Among the 25 cross combinations H23 was
identified as the superior cross combination followed by H16 and H; The parents of
these cross combinations can be used for raising biclonal seed gardens, as they had
a good specific combining ability.
The floral traits did not vary markedly in the hybrids. However the
qualitative traits exhibited wide variation in the different hybrids.
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