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Abstract
The present investigation was carried out at Department of Cotton Breeding, Cotton Research Institute, Agriculture Research Center, Giza during the growing seasons 2002-2005.
The work was aimed to study the genetic consequences of incorporating new genes from hirsutum cottons into two Egyptian cultivars via interspecific hybridization to increase their yield potentials using BC1s derived from backcrossing interspecific F1s to their Egyptian parents.
The genetic effects, based on components of generation means, of studied populations within each interspecific cross were examined. The work was extended to follow incorporating of such new genes by subjecting BC1 populations to clustering analysis to select some promising BC1 plants that outperform their Egyptian parents.
In the season of 2002, selfed seeds of the two Egyptian parents; Giza 85 and Giza 86; and the three American parents; Tamcot Camd-e, Acala Maxxa and Palala; were planted. Interspecific hybridization was done using the Egyptian varieties as female parents and the American ones as males, in order to obtain interspecific F1 seeds.
In the season of 2003, selfed seeds of the Egyptian parents and the obtained F1 seeds were planted and the interspecific F1 plants were backcrossed to their corresponding Egyptian parents to produce BC1 seeds.
In the season of 2004, selfed seeds of all parental varieties, their derived interspecific F1 seeds and their BC1 seeds were planted in complete randomized experimental design, with three replicates. At the end of this season, individual plants of each generation were separately harvested and