Indian Society of Genetics & Plant Breeding

Inheritance studies for earliness, yield and fibre traits using simplified triple test cross in G. hirsutum

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The simplified triple test cross analysis provides a precise
test for epistasis along with unambiguous estimates of
additive and dominance genetic variance. Different
generations of simplified triple test cross analysis grown
in a randomized complete block design with three
replications were evaluated for major quantitative
characters of earliness, yield and fibre quality. The analysis
of variance for epistasis revealed the presence of epistasis
for most of the characters studied. The analysis of variance
for sums indicated the presence of additive genetic
component in the inheritance of most of the characters
except for number of monopods and sympods per plant,
plant height, bolls at first sympod, bolls at sympod at 50
per cent plant height, boll weight, fibre strength and fibre
quality index. Whereas the analysis of variance for
differences indicated the involvement of dominance
component in the inheritance of length of first sympod,
days to maturity, seed cotton yield, number of bolls per
plant, lint yield, ginning outturn, 2.5% span length, fibre
fineness and fibre maturity. Both additive and dominance
components of genetic variation were observed to be
involved in the inheritance of length of first sympod, days
to maturity, seed cotton yield, number of bolls per plant,
lint yield, ginning outturn and 2.5% span length. Out of
these, length of first sympod, days to maturity, number of
bolls per plant, ginning outturn and 2.5% span length
showed higher magnitude of dominance genetic
component indicating degree of dominance to be in the
range of over dominance. The appropriate breeding
methods for the improvement of different characters have
been discussed.
 

Keywords: Simplified triple test cross, epistasis, additive genetic component, dominance genetic component, G. hirsutum

Info

Year: 2010
Volume: 70
Issue: 1
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906

Authors

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Paramjit Singh info_circle
G. S. Chahal info_circle

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