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GENETIC ANALYSIS OF YIELD AND ITS COMPONENTS OVER ENVIRONMENTS IN COWPEA [Vigna unguiculata (L.) Walp]

KrishiKosh

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Title GENETIC ANALYSIS OF YIELD AND ITS COMPONENTS OVER ENVIRONMENTS IN COWPEA [Vigna unguiculata (L.) Walp]
 
Creator CHAUDHARI, SIDDHARTHARAJ B.
 
Contributor NAIK, M.R.
 
Subject dna, vegetables, biological development, physical control, mutation, humus, storage structures, planting, iba
 
Description In the present investigation, information on the
magnitude of heterosis, combining ability and its
interactions with locations, G x E interactions and
stability parameters were obtained for seed yield per
plant and its related components following half diallel
mating design involving eight varieties/strains of cowpea.
The eight parents and their 28 F1s were tested under four
environments created artificially through two different
sowing dates each in summer and kharif 2007 at College
Farm, Navsari Agricultural University, Navsari in a
randomized block design with three replications.
Significant difference existed among the
parents and hybrids, indicating considerable genetic
variation among these genotypes.
Highly significant positive heterosis over mid
and better parent for seed yield and its component
characters suggested that there is a good scope of
exploiting heterosis commercially and possibility of
isolating desirable segregants. The cross DCP-10 x GC-5
manifested highest heterosis over better parent with high
seed yield per plant followed by crosses DCP-2 x V-240,
GC-4 x GC-5 and V-240 x GC-5. Heterotic effect for seed
yield per plant was found to be associated with heterosis
for its related traits in majority of crosses.
Combining ability analysis revealed that both
additive and non-additive variances were significant for
seed yield per plant and its related traits indicating their
involvement in the expression of various traits. The
magnitude of non-additive variance was higher for seed
yield per plant and its contributing traits indicating
predominant role of non-additive gene action in the
inheritance of the traits. Among the parents V-240, GC-4
and GC-5 were good general combiners for seed yield and
most of yield components. The parents viz., RC-19 and
GC-3 were good general combiners for earliness and
short plant stature. The cross DCP-10 x GC-5, DCP-2 x
V-240 and GC-4 x GC-5 showed sca effects of higher
order for seed yield and majority of yield components.
Expression of heterosis for seed yield and its
components was related to gca effects of parents. High
heterotic crosses for various characters involved at least
one parent with high gca effect. A fairly close and
positive association between per se performance and
combining ability in both parents and hybrids was
observed for almost all traits taken under study. The
crosses which depicted high sca effects for seed yield and
its attributes were in general, combinations of parents
with good x good or good x poor gca effects.
Highly significant G x E interaction for majority
of the traits was found which indicated differential
response of genotype to varied environments. Both linear
and non-linear components were found important in
building up total G x E interactions. None of the parent
and hybrid was found average stable for all the
characters studied across environments. Non-additive
effects played significant role in the inheritance of seed
yield and its components. Therefore, it is suggested that
biparental mating system could be followed for
accumulation of additive gene effect and breaking
undesirable linkage in order to exploit both additive and
non-additive gene effects.
 
Date 2016-03-09T08:37:47Z
2016-03-09T08:37:47Z
2008-10
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/64958
 
Language en
 
Format application/pdf
 
Publisher Navsari Agricultural University, Navsari