Double crosses analysis for yield component and fiber traits in Egyptian cotton ( Gossypium barbadense L.) [electronic resource].

Includes reference.

The combining ability estimates for yield , yield components and fiber traits in cotton were the ultimate aim of this investigation. In this study six cotton varieties i.e.: G. 45 , G.89 x Pima S6 , C.B.58 ,TNB , Aust. 12 and G. 89 belong to Species Gossypium barbadense L. and their 45 double crosses were used for this purpose. In the 2008 growing season • these all genotypes ( six varieties and 45 double crosses) were evaluated in a field trial experimental at Sakha Agriculture Research Station for following traits: seed cotton yield per plant (S. C.Y.lP.), lint cotton yield per plant (L.C.Y./P.) , number of seeds per boll ( No. S.lB.) , number of bolls per plant ( No. B./P.) • fiber strength ( F.S.) , fiber finenesses ( F.F.) ,2.5% span length (2.5% S.L.) , 50% span length (50% S.L.) and uniformity ratio ( U.R.%.) . The results showed that the mean squares of genotypes were significant and highly significant for all the studied traits . Further partition of crosses mean squares to its component showed that the mean squares due to 1- line general , 2- line specific effect, 2- line arrangement , 3- line arrangement and 4- line arrangement were either significant or highly. significant for most studied traits suggesting the presence of the additive and non- additive variance in the inheritance of these traits. For the mean performances, the results showed that the cross

Summary in arabic.

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