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Cotton Genomics and Genetics
2013, Vol.4, No.2, 13-32 http://cgg.sophiapublisher.com
Research Report
Open Access
Combining Ability for Yield and Yield Attributing Characters in Line x Tester
Interspecific Hybrids (
G. hirsutum × G. barbadense
) for Confirmation of
Heterotic Groups
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 Genetics, 2013, Vol.4, No.2 doi: 10.5376/cgg.2013.04.0002
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
The prime objective of cotton breeders is to develop new varieties with high yield and yield components. Present study
aims to estimate general combining ability of the parents and specific combining ability of hybrids for yield and yield components.
The term heterotic group refers to a group of related or unrelated genotypes from the same or different populations, which display
similar combining ability and heterotic response when crossed with genotypes from other genetically distinct germplasm groups. If
two lines A and B are found to give potential crosses with testers T
1
and T
2,
it is possible to increase the genetic distance between
these opposite pairs A, B
vs
, T
1
and T
2
by following population improvement scheme for improving combining ability defined in
cross pollinated crops by introducing suitable changes to match the crossing system seen in self pollinated crops. The Line x Tester
study was planned to assess the relative potential of the barbadense and hirsutum in developing interspecific hybrid combinations.
The objective of this study was to determine the relative the 4 barbadense and 23 hirsutum lines. Barbadense were used as lines and
hirsutum were used as testers. The ongoing study at Agricultural Research Station, Dharwad on evaluation of interspecific hybrids
led to formation of a heterotic box of two barbadense lines DB 533 and DB 534 and hirsutum testers DH 98-27 (T
1
), ZCH 8 (T
2
),
178-24 (T
3
) and DH 18-31(T
4
). Among four barbadense lines positive
gca
effects for seed cotton yield was recorded by DB 533 and
DB 534 confiriming the potential of these barbadense lines in developing productive interspecific hybrids. Among 23 hirsutum
testers, four testers DH 18-31, ZCH 8, DH 98-27 and 178-24 exhibited good positive values of
gca
effects for seed cotton yield and
were located among top ten testers ranks 2, 8, 1 and 7 respectively when compared to other hirsutum testers.
Keywords
Combining ability;
gca
;
sca
; Heterotic group
Introduction
Cotton is a major fiber crop and contributes a large
share in the economy of India. Cotton is the main
source of foreign exchange earnings. There is need to
enhance cotton yield and fiber quality to become a key
producer in the global cotton market. All cotton
breeders aim to develop cotton cultivars with good
fiber quality and yield. Yield of cotton can be
improved by improving characteristics that make
genotype of cotton plant, such as; developmental
characters (optimum plant height, number of sympodial
and monopodial branches and number of nodes or
internodal length), economic characters (number of
bolls per plant, boll size or weight, yield of seed
cotton) and quality traits (lint percentage or ginning
out turn, lint index, seed index, staple length, fiber
strength and fiber fineness). Plant breeder should combine
these desirable components of yield and quality.
Combining ability method is important in the breeding
programme as it provide information’s about the
heritability of crossing parents involved in the
production of hybrid cotton seeds. It provides a
specific guide line to the plant breeder about the
establishment of a unique breeding experiment for the
evolution of spectacular cotton varieties.
Preferred citation for this article:
Yanal Alkuddsi et al., 2013, Identifying Combining Ability for Yield and Yield Attributing Characters in Line x Tester Interspecific Hybrids (
G. hirsutum
×
G. barbadense
) for Confirmation of Heterotic Groups, Cotton Genomics and Genetics,Vol.4, No.2 13-32 (doi: 10.5376/cgg.2013.04.0002)
Received: 29 Jun., 2013
|
Accepted: 11 Jul., 2013
|
Published: 11 Nov., 2013