Fertility Relationships Among Interspecific Hybrid Progenies of Gossypium1
- W. H. McKenzie2
The two cultivated New World cottons, Gossypium Hirsulum L. and Gossypium barbadense L., together with four hybrid families comprising a representative range between them were studied to obtain a quantitative measure of the potential for and the realization of reproductivity.
Three of the four hybrid families possessed a greater number ot fertilized ovules per ovary than either of the parent strains. Heterosis was thought to be largely responsible. Hybrid families, however, made less efficient use of their reproductive potential. Families with the greatest mixture of germplasm which correspondingly possessed the greatest number of fertilized ovules per ovary, matured the smallest number of seeds per boll. Selfing brought about an even more drastic reduction in the number of seeds recovered per boll for all of the hybrid families. A smaller, but statistically significant, elimination of hybrid progeny accompanied germination.
Even though the majority of elimination was postzygotic, it was concluded that the relative amount of interspecific recombination occurring during gamete formation could adequately account for the observed reproductive breakdown.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © . .