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Cotton Genomics and Genetics
2013, Vol.4, No.4, 45-59 http://cgg.sophiapublisher.com
Research Report
Open Access
Studies of Heterosis for Exploitation of Heterotic Boxes in Seed Cotton Yield and
its Attributing Characters
Yanal Alkuddsi , S.S. Patil , S.M. Manjula , B.C. Patil , H.L. Nadaf , B.S. Nandihali
Agricultural Research Station, Dharwad Farm, University of Agricultural Sciences, Dharwad, Karnataka, India, 580005
Corresponding author email: y.alkuddsi@hotmail.com;
Authors
Cotton Genomics and Genetic, 2013, Vol.4, No.4 doi: 10.5376/cgg.2013.04.0004
Copyright
© 2013 Yanal Alkuddsi. 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.
Abstract
One hundred twelve inter specific hybrids between
G. hirsutum
×
G. barbadense
derived from twenty eight
G.
barbadense
lines and four
G. hirsutum
testers DH 98-27 (T
1
), ZCH 8 (T
2
), 178-24 (T
3
) and DH 18-31 (T
4
) were evaluated to study
heterosis for seed cotton yield and its component traits. Significant heterosis was observed for the characters under study indicating
the presence of genetic diversity among the parental lines. For seed cotton yield, thirty crosses showed significant positive heterosis
and only one cross showed significant negative heterosis over their mid parent. The cross DH 98-27 X (DB 533 x DB 534 F
4
IPS 49)
(39.97) recorded highest significant positive heterosis over commercial
Bt
check MRC 6918 and the cross 178-24 X (DB 533 x DB
534 F
4
IPS 33) (-44.37) exhibited lowest significant negative heterosis over MRC 6918. Two crosses showed significant heterosis in
positive direction and two crosses showed significant heterosis in negative direction over MRC 6918. In case of DCH 32 non
Bt
check, the cross DH 98-27 X (DB 533 x DB 534 F
4
IPS 49) (44.31) showed highest significant positive heterosis over this check, but
the cross 178-24 X (DB 533 x DB 534 F
4
IPS 33) (-42.65) recorded lowest significant negative heterosis value over DCH 32
commercial check. Two crosses exhibited significant positive heterosis over DCH 32 commercial check and only one cross showed
significant negative heterosis.
Keywords
Heterosis; Inter specific crosses;
G. Hirsutum
;
G. Barbadense
Introduction
Cotton is one of the most important commercial crops
of India cultivated mainly for its fiber and other by
products. Cotton, through cloth, has influenced the
culture and civilizations. In the process of forming
clothes and garments, it provides livelihood and
employment to workers engaged in cloth making,
designers, traders and the like. Cotton is one of the
few crops which are accessible to development of
genotypes as varieties and at the same time amenable
for
commercial
exploitation of
heterosis.
Development of several hybrids during the last decade
has contributed to a quantum jump in cotton
productivity. Though cotton production in the country
has registered marked improvement in recent years,
the yield levels of hybrids appear to have reached
stagnation. The important reasons attributed for this is
the lack of systematic efforts made to develop hybrid
oriented populations, derived lines with improved
combining ability and develop new hybrids based on
such genetically diverse high combiner lines.
Response to selection for any character is dependent
on the existence of variability for that character. Quick
gains are possible through selection during breeding.
Cotton improvement programmes primarily lay
emphasis on improvement of hybrids by improving
the performance of hybrid parents. Emphasis is not
laid on creation of variability and assessing the nature
and magnitude of the variability for combining ability.
Like other characters, even for combining ability,
variability can be created either by inducing mutations
or by crossing genotypes and generating
recombinational variation. Though such studies are not
available in cotton, in sorghum, attempts were made to
assess the nature of induced variability for combining
ability by crossing the mutant lines with male sterile
tester (Shashidhar et al., 1989 and Patil et al., 1991).
Preferred citation for this article:
Yanal Alkuddsi et al., 2013, Studies of Heterosis for Exploitation of Heterotic Boxes in Seed Cotton Yield and its Attributing Characters, Cotton Genomics
and Genetics,Vol.4, No.4 45-59 (doi: 10.5376/cgg.2013.04.0004)
Received: 21 Jul., 2013
|
Accepted: 31 Jul., 2013
|
Published: 15 Nov., 2013
Cotton Genomics and Genetics