Genetic analysis of yield traits in Egyptian cotton crosses (Gossypium barbdense L.) under normal conditions

Abstract

To generate high-yielding cultivars with favorable fiber quality traits, cotton breeders can use information about combining ability and gene activity within a population to locate elite parents and potential F1 crosses. To this end, in the current study, twelve cotton parents (eight genotypes as female parents and four testers) and their F1 crosses obtained utilizing the linex tester mating design were evaluated for their general and specialized combining abilities (GCA and SCA, respectively) of yield traits. The findings showed that for all the investigated variables, variances owing to genotypes, parents, crosses, and parent vs cross showed extremely significant (P ≤ 0.01) differences. Additionally, throughout the course of two growing seasons, the mean squares for genotypes (parents and crosses) showed strong significance for all the variables under study. The greatest and most desired means for all the examined qualities were in the parent G.94, Pima S6, and tester G.86. The best crossings for the qualities examined were G.86 (G.89 × G.86), G.93 × Suvin, and G.86 × Suvin. The parents' Suvin, G89x G86 and TNB were shown to have the most desired general combining ability effects for seed cotton yield/plant, lint yield/plant, boll weight, number of bolls/plants, and lint index, while Suvin, G.96 and pima S6 were preferred for favored lint percentage. For seed cotton yield, lint percentage, boll weight, and number of bolls per plant per year, the cross-G.86 x (G.89 × G.86) displayed highly significant specific combining ability impacts. The crosses G.86 × Suvin, Kar x TNB, G.93 × Suvin, and G.93 × TNB for all the studied traits for each year and their combined were found to have highly significant positive heterotic effects relative to better parent, and they could be used in future cotton breeding programs for improving the studied traits.

Estimation of Genetic Parameters for Some Agronmic and Technological Quantitative Traits in Cotton Using Line X Tester Analysis

“…According to fiber trait Table (3), all crosses showed derived positive or negative better parents heterosis effects except for Micronaire reading which was negatively significant better parents heterosis effects for most crosses except for the crosses Giza92 x PimaS4, Giza92 x PimaS6, Giza92 x Australy13 and Giza93 x TNB1 which recorded insignificant better parents heterosis effects. Similar results agreed with those reported by Arif et al , (2022) , Abdel-Aty et al, (2023), Hottigodar et al, (2023) and Parmar et al, (2023) . The GCA and SCA effects of parents and their crosses for different yield contributing traits are presented in Table 4 and Table 5, respectively.…”

Exploring agro-morphological and fiber traits diversity in cotton (G. barbadense L.)

“…The cotton genotypes G.96, G.92, Karchenky, G.94, G.93, B.B.B, and G.70 had the greatest average values for fiber qualities when compared to the other cotton genotypes. Likewise, a multitude of previous studies have demonstrated comparable patterns in the assessed agro-morphological parameters [ 46 , 47 ].…”