Genetic Effects Assessment through Line × Tester Combining Ability for Development of Promising Hybrids Based on Quantitative Traits in Gossypium hirsutum L.

Abstract

Line × Tester combining ability analysis involving five lines (cultivars i.e., CIM-446, CIM-473, CIM-506, CIM-554 and SLH-284) and three testers (cultivars viz., CIM-496, CIM-499 and CIM-707) was carried out during 2015 and 2016 to determine the inheritance for earliness, yield and lint traits in upland cotton. Genotypes revealed significant (P≤0.01) variations for all the traits. On average, F 1 hybrids showed the significant increase over parental means for yield traits. Mean squares due to general (GCA) and specific combining ability (SCA) were highly significant, which suggested that additive and non-additive gene actions were involved in controlling all the characters. However, the preponderance of non-additive type of gene action observed for majority of the traits. Lines (SLH-284, CIM-473) and pollinators (CIM-707, CIM-496) were leading general combiners for majority of the traits. F 1 hybrids (CIM-473 × CIM-496, SLH-284 × CIM-707 and CIM-446 × CIM-496) which involve best general combiners, showed the leading performance for yield and lint traits. Heritability was moderate to high with appreciable genetic gain for majority of the traits. Except for lint %, the correlation of seed cotton yield was positive with other traits. The significance of additive and non-additive components suggested integrated breeding strategies with delayed selection for development of cotton hybrids with improvement in earliness and seed cotton yield.

Combining ability and gene action analysis for yield traits, fiber quality, and biochemical traits of cotton (Gossypium hirsutum L.)

“…The variance due to GCA were higher in magnitude than their respective SCA variances for ginning outturn indicating preponderance of additive gene effects for these characters. Almost similar results have been reported by Makhdoom et al (2019) [5] . For other characters except ginning outturn having higher SCA variance than their respective GCA variance.…”

“…Out of them, H-1452 × TCH-1705 for days to 50% flowering, all five crosses for bolls per plant, four crosses for boll weight viz., GISV-171 × GJHV-523, GSHV-172 × TCH-1828, PBH-116 × SCS-1061, PBH-116 × TCH-1705, one cross PBH-116 × TCH-1705 for seed index and oil content, one cross H-1452 × TCH-1705 for gossypol content and one cross PBH-116 × SCS-1061 for protein content showed significant SCA effect in desired direction. Similar results have been reported by Patel et al (2012) [8] , Kumbhalkar et al (2018) [4] and Makhdoom et al (2019) [5] .…”

Assessment of combining ability and gene action for seed cotton yield and fibre quality traits in Lintless-Fuzzless genotypes of upland cotton (Gossypium hirsutum. L)

“…Among the 36 hybrids evaluated, Cross TCH1646 / CO17 and MCU5 / AKH9881 were found to be promising hybrids as they exhibited high per se performance and desirable sca effects for prime most trait seed cotton yield and yield attributing traits. Thus, the study also proved that usage of parental cultivar with best gca as one of the parents produce superior hybrids (Makhdoom et al, 2019).…”

Genetic Analysis of Yield and Fiber Traits in Cotton (Gossypium barbadense L.) under Normal Irrigation and Drought Stress Conditions

“…Otherwise, dominance effects (H1 and H2) mainly contributed for number of bolls per plant, and partial dominance was involved for plant height, number of sympodial branches, boll weight, and yield of seed cotton, lint percentage, staple length and fiber strength (Raza et al, 2013). In line-tester analysis, the additive variance was significant for fiber length, fiber fineness and fiber elongation, and non-additive gene effects for seed cotton yield, lint yield, lint%, fiber strength and fiber uniformity (Karademir et al, 2009;Shaukat et al, 2013;Memon, 2017;Mahrous, 2018;Makhdoom et al, 2019). Likewise, the ratio δ 2 GCA/δ 2 SCA depicted the predominance of non-additive types of gene action for plant height, seed cotton yield and its components and fiber length and fiber strength (Karademir et al, 2009;Khokhar et al, 2018;Munir et al, 2018;Patil et al, 2018;Unay et al, 2019).…”