Estimates of genetic parameters using six populations in Egyptian Cotton(Gossypium barbadense L.) [electronic resource].

Includes reference.

The six populations P1 , P2 , F 1, F 2, BC 1 and BC2 of four cotton crosses were established during summer 2004 to 2005 and evaluated in 2006 summer season at Assiut .The experiment was grown in a randomized complete blocks design ( R.C.S.D ) with three replications. The means of the six generations recorded for plant height, days to flowering, no.of open bolls, no. of unopened bolls ,boll weight ,lint yield/plant and cotton yield/plant, , were subjected to scaling test, and six parameters method to detect epistasis and estimates of m, d, h, i, j and L parameters. Results revealed the epistatic gene effect cannot be ignored when establish a new breeding programc to improve cotton populations for economic traits. The inheritance of all traits studied was controlled by additive and non-additive genetic effects, with greater values of dominance gene effect than the additive one in most cases. Among the nonadditive effect, the other fixable component, i.e., additive x additive (i) type of interaction, was also significant and constituted a major portion of the gene effects. The signs of (h) and (L) were opposite in the case of plant height, days to flowering ,no.of open bolls, no. of unopened bolls ,boll weight, lint yield and cotton yield/plant, in most crosses suggesting duplicate type of non-allelic interaction in these traits. The coincidence of sign and magnitude of heterosis and inbreeding depression was detected for most traits.

Summary in arabic.

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