Development of Heterotic Groups (G. hirsutum vs G. barbadense) Based on Combining Ability and Inter Specific Hybrids Performance for Yield and Fiber Quality Traits
Yanal ahmad Alkuddsi
Agricultural Research Station, Dharwad Farm, University of Agricultural Sciences, Dharwad, Karnataka, India 580005
Cotton Genomics and Genetics, 2013, Vol. 4, No. 3 doi: 10.5376/cgg.2013.04.0003
Received: 29 Jun., 2013 Accepted: 11 Jul., 2013 Published: 13 Nov., 2013
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Preferred citation for this article:
Yanal Alkuddsi et al., 2013, Development of Heterotic Groups (G. hirsutum vs G. barbadense) Based on Combining Ability and Inter specific Hybrids Performance for Yield and Fiber Quality Traits, Cotton Genomics and Genetics,Vol.4, No.3 33-44 (doi: 10.5376/cgg.2013.04.0003)
Utilization of heterosis depends on genetic diversity existing between the parents, magnitude of dominance at the yield influencing loci and the genetic distance between the chosen parental genotypes. It is possible to maximize heterosis by enhancing genetic distance between two chosen parental populations. The main objective of the Line x Tester study was to determine the combining ability status of the barbadense and hirsutum lines included in the heterotic box. These lines were compared with other barbadense and hirsutum lines. For the pattern of combining ability and the potentiality of the interspecific hybrids developed based on them. The efforts on creating recombinational variability have begun with two barbadense lines. However to compare the potentiality of the 8 hybrids with other potential hybrids developed over years at Dharwad centre and best commercial hybrids (Bt and non Bt), a separate evaluation of these hybrids was taken up. Realizing the need for developing potential interspecific (G. hirsutum x G. barbadense) hybrids, a detailed study was initiated at UAS Dharwad to identify hirsutum and barbadense genotypes capable of giving potential interspecific hybrids. Based on this study done during earlier years in 2009-2010 two barbadense DB 533 and DB 534 and four hirsutum DH 98-27 (T1), ZCH 8 (T2), 178-24 (T3) and DH 18-31 (T4) lines giving best hybrids (H x B) combinations between them were selected. 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. The potential of 8 bench mark crosses of heterotic box ZCH 8 x DB 533, DH 98-27 x DB 534, DH 18-31 x DB 533, ZCH 8 x DB 534, 178-24 x DB 533, DH 98-27 x DB 533, DH 18-31 x DB 534 and 178-24 x DB 534 recorded higher per se performance for seed cotton yield ranking 1, 2, 4, 6, 8, 10, 11 and 14 out of 49 crosses. These crosses also recorded superior value for yield attributing characters like number of bolls and mean boll weight. The mean performance of these crosses associated with this heterotic box was found to be 2174 kg/ha as compared to the overall mean of best HB interspecific hybrids which was 1921 kg/ha.
Heterotic groups; Interspecific hybrids; Combining ability; G. hirsutum, G. barbadens