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International Journal of Horticulture 2012, Vol.2, No.5, 21
-
24
http://ijh.sophiapublisher.com
21
Research Report Open Access
Effect of Biparental Mating on Association Pattern Among Quantitative Characters in
Okra [
Abelmoschus esculentus
(L.) Moench]
Guddadamath S.G. , Mohankumar H.D. , Salimath P.M.
Department of Genetics and Plant Breeding, UAS, Dharwad-5 Karnataka, India
Corresponding author email: somu.guddu@gmail.com;
Authors
International Journal of Horticulture, 2012, Vol.2, No.5 doi: 10.5376/ijh.2012.02.0005
Received: 17 Dec., 2012
Accepted: 24 Dec., 2012
Published: 31 Dec., 2012
Copyright
: © 2012 Guddadamath et al. This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use,
distribution, and reproduction in any medium, provided the original work is properly cited.
Preferred citation for this article
:
Guddadamath et al., 2012, Effect of Biparental Mating on Association Pattern Among Quantitative Characters in Okra [
Abelmoschus esculentus
(L.) Moench],
International Journal of Horticulture, 2012, Vol.2, No.5 21-24 (doi: 10.5376/ijh.2012.02.0005)
Abstract
An experiment was undertaken to study
relationship between various economically important traits
in three
populations
of the okra
viz,
biparental (BIP) F
2
, single cross (SC) F
2
, and double cross (DC) F
2
populations for the purpose of genetic
improvement.
The analysis of variance revealed highly significant differences for the populations under study for the characters. The
association studies revealed
the characters fruits length, average fruit weight, number of fruits per plant (0.929**), number of
branches per plant and plant height showed significant positive association with fruit yield per plant, and also showed significant
positive association among themselves. This suggested that these characters should be considered while selecting plants for yield
improvement in segregating populations of okra. It was also revealed that intermating in early segregating generations of different
individuals lead to release of additional variability.
Keywords
Okra;
Abelmoschus
esculentus
(L.) Moench; Biparental mating; GCV; PCV
Background
Okra [
Abelmoschus esculentus
(L.) Moench.] is an
important vegetable crop cultivated in tropical and
sub-tropical parts of the world. Tender fruits are
used as vegetable, eaten boiled or in culinary
preparation as sliced and fried pieces. It is also used
for thickening soups and gravies, because of its high
mucilage content. Okra fruits are also sliced and sun
dried or canned and pickled for off-season use. It has
good nutritional value, particularly vitamin-C
(30 mg/100 g), calcium (90 mg/100 g), Iron (1.5 mg/100 g)
rich in Iodine (97 mg/100 g).
Generally amount of variability generated is more in
the early segregating generations as compared to
later generations.
Bhendi is one vegetable crop
where heterosis has been exploited successfully.
Yield plateau seems to have been reached in
heterotic hybrids. In order to break this barrier there
is a need to develop truly potential inbreed line
which in combination can produce really novel
hybrids with desirable maximum heterosis. Among
the various approaches for developing inbred lines,
selection in potential segregating population is an
important one. But then, the key to success lies in
developing the really promising potential segrega-
ting populations.
If we attempt intermating in early
segregating generations of different individuals
additional variability will be released, since
biparental mating among the segregates in the F
2
of
a cross may provide more opportunity for the
recombination to occur, mop up desirable genes and
as a result release concealed variability. In view of
the above facts, an attempt has been made in the
present study to improve the yield and yield
contributing characters by releasing more variability
which in turn available for selection in segregating
generations of okra.
Materials and Methods
The present investigation was carried out at
Horticulture Research Station, Devihosur, Haveri,
Karnataka during 2008 and 2009. The experimental
material was derived from three okra lines L
-
1, L
-
2
and L
-
3. In summer 2008 single cross (L
-
1×L
-
2)
and double cross of [(L
-1
× L
-
2) × (L
-
2 × L
-
3)] F
1
populations were developed and in next season
(kharif 2008), these populations were selfed to get
their respective F
2
populations. Biparental progenies
were (BIP F
2
) developed by random mating selected
superior plants in the F
2
segregating population
(Kearsay KJ, 1965). The experimental material
comprised of two BIP, three single cross and two
double cross F
2
’s populations. In 2009 all these F
2