Epistasis and genetic correlation in cotton using F₂ triple test cross [electronic resource].

Includes references.

Assessment and quantifying the components of genetic variance, epistasis and additive, together with dominance genetic correlation using 30 families of catonl (Gossypium barbadense) was done in F2 triple test cross analysis derived from Giza 45 x Karshenky2.Results revealed that overall epistasis were important role in the inheritance of all traits, except for boll weight. Partitioning of epistasis into its components, (i) type of epistasis, additive x additive and (i+j) types of epistasis, additive x dominance and dominance x dominance were significant for most traits with predominant of (i) type, additive x additive. Additive gene effects were significant and played a major role for all characters, while dominance gene effects were significant for some characters. The estimates of F value (direction of dominance) were not significant for all characters irrespective of their sign indicated ambidirectional dominant genes among parents. Genetic correlations revealed additive and epistasis gene effect controlling most traits were associated with each other. Thus selection based on such type may indicate that the direct selection would be effective for improving such characters.

Summary in Arabic.

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