Genetic analysis for Diallel crosses on Egyptian cotton (Gossypium Barbadense L. )‎

Abstract EN

The present experiment was carried out to assess the general combining ability (GCA) and specific combining ability (SCA) of seven important commercial cultivars of Egyptian cotton and their 21 F1 and F2 crosses.

Significant differences among genotypes were found for all studied traits.

Combining ability analysis of variance revealed significant differences for GCA and SCA effects among the parents and hybrids for almost all traits.

The results suggested the presence of additive and non-additive gene action for almost all of the traits.

The ratio of G.C.A/S.C.A for F1 and F2 hybrids decreased from unity for all characters studied.

The results (G.C.A) for seven parents revealed the good combiner for lint yield/plant and fiber fineness was the parent Giza 90, while for seed cotton yield/plant and seed yield /plant was the parent Giza 87 while, for fibre strength was the parent Giza 83 for F1 and F2 generations.

In F1 hybrid estimates of (S.C.A.) effects revealed that significant SCA effects were observed for most crosses.

Moreover, the best combinations were (Giza 86 x Giza 90) for seed cotton yield /plant and fiber fineness, (Giza 88 x Giza 83) for lint yield/plant and fibre strength.

But the F2 hybrid of the best combinations were (Giza 90 x Giza 83) for seed cotton yield/plant and fiber fineness, (Giza 86 x Giza 90) for lint yield/plant and fibre strength.

It can be conclude that possibility of use the superior crosses for improving Egyptian cotton traits by breeding processes and selection in sequent generations.