Estimation of Genetic Components by Using Triallel Crosses Mating Design

Abstract

This investigation carried out to determine combining ability and types of gene action for yield component traits and some fiber properties in cotton. The genetic materials in this investigation included six cotton varieties i.e. G.85 (P1) ; Kar. (P2) ; G.93 (P3); Pima S7 (P4) Aust.12 (P5) and G.86 (P6). All these varieties belong to the species Gossypium Barbadense L. and they were utilized in a trialed crosses mating design to produce 60 hybrids. In 2013 growing season all genotypes which included 60 genotypes were evaluated at the Agriculture experimental Station at Sakha using a RCBD with three replications. the following traits were estimated : boll weight, seed cotton yield per plant, lint cotton yield per plant, lint percentage, number of bolls per plant, seed index, fiber fineness, fiber strength, Upper half mean and uniformity ratio %. The results indicated that the mean squares of genotypes were highly significant for all studied traits. The results also showed that the performances of most the three way crosses were as good as or better than their both grand parents or / and their third parent. From the analysis of triallel crosses the results illustrated that the variety G.86 (P6) was a good combiner as a parent and / or grand parent for most of studied traits and Kar. (P2) and G.93 (P3) were good combiners for most of studied fiber properties. In general, the crosses (Kar.

Heterosis and Estimation of General and Specific Combining Ability as Base for Selected Superior Recombination of the Some Crossed Cotton Genotypes

“…The good x good GCA combination could be due to additive and additive types of gene action which is fixable on nature which had significant SCA effects for studied traits. Yahia [32]; Sorour et al [33], Chinchane et al [26] and Yehia and EL-Hashash [34]. This study suggested that information of GCA effects of parent should be considered along with SCA effects and presence performance of hybrid for predicting the value of any hybrid.…”