Heterosis and Combining Ability in Greengram (Vigna radiata(L.) Wilczek) for Biological Nitrogen Fixation and Yield
By: Bhadra K.
Contributor(s): Wilson D(Guide).
Material type:
BookPublisher: Vellayani Department of Plant Breeding and Genetics, College of Agriculture 1998DDC classification: 630.28 Online resources: Click here to access online | Click here to access online Dissertation note: MSc Abstract: The research programme was carried out in diallel manner at the
Department of Plant Breeding and Genetics, College of Agriculture,
Vellayani, Thiruvananthapurarn during 1996-98. The objective was to assess
the general and specific combining abilities and gene action involved in
the inheritance of biological nitrogen fixation traits and yield attributes in
green gram. The study was conducted in a diallel model in a replicated
field experiment using seven varieties of greengram, out of them four
were high yielders and three with good nitrogen fixing capacity. Seven
parents and twenty one hybrids were also raised in pots with seven
replications to study the nodulation efficiency of hybrids and parents.
Analysis of variance revealed highly significant differences among
the genotypes for all the characters. Except for nitrogen content at 50%
flowering and harvest index, gca effects were not significant, for all the
other characters both gca and sea effects were significant. The additive to
dominance ratio indicated a preponderance of non-additive gene action for
all characters except number of secondary roots and weight of nodules.
The combining ability analysis revealed that NDM-88-14 was the
good general combiner with respect to important nitrogen fixation traits
where as P-9333 was the best general combiner with respect to yield and
2
other yield attributes. P-9333 x NDM-88-14 was the best specific
combiner for nitrogen content. P-9333 x IIPRM-3, IIPRM-3 x LGG-444
and P-9333 x COGG-902 were the best specific combiners for yield and
yield attributes.
Combining the mean performance, sca effects and heterobeltiosis
P-9333 x NDM-88-14 was identified as the good hybrid combination for
nitrogen fixation traits. Re~arding yield, the hybrids P-9333 x IIPRM-3,
P-9333 x COGG-902 turned out to be outstanding. Therefore, these hybrids
can be utilized for crop improvement programme.
| Item type | Current location | Call number | Status | Date due | Barcode |
|---|---|---|---|---|---|
Theses
|
KAU Central Library, Thrissur Theses | 630.28 BHA/HE (Browse shelf) | Available | 171414 |
MSc
The research programme was carried out in diallel manner at the
Department of Plant Breeding and Genetics, College of Agriculture,
Vellayani, Thiruvananthapurarn during 1996-98. The objective was to assess
the general and specific combining abilities and gene action involved in
the inheritance of biological nitrogen fixation traits and yield attributes in
green gram. The study was conducted in a diallel model in a replicated
field experiment using seven varieties of greengram, out of them four
were high yielders and three with good nitrogen fixing capacity. Seven
parents and twenty one hybrids were also raised in pots with seven
replications to study the nodulation efficiency of hybrids and parents.
Analysis of variance revealed highly significant differences among
the genotypes for all the characters. Except for nitrogen content at 50%
flowering and harvest index, gca effects were not significant, for all the
other characters both gca and sea effects were significant. The additive to
dominance ratio indicated a preponderance of non-additive gene action for
all characters except number of secondary roots and weight of nodules.
The combining ability analysis revealed that NDM-88-14 was the
good general combiner with respect to important nitrogen fixation traits
where as P-9333 was the best general combiner with respect to yield and
2
other yield attributes. P-9333 x NDM-88-14 was the best specific
combiner for nitrogen content. P-9333 x IIPRM-3, IIPRM-3 x LGG-444
and P-9333 x COGG-902 were the best specific combiners for yield and
yield attributes.
Combining the mean performance, sca effects and heterobeltiosis
P-9333 x NDM-88-14 was identified as the good hybrid combination for
nitrogen fixation traits. Re~arding yield, the hybrids P-9333 x IIPRM-3,
P-9333 x COGG-902 turned out to be outstanding. Therefore, these hybrids
can be utilized for crop improvement programme.
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