Abstract:Studies were conducted on the embryo sac development and early embryogenesis in thetriploid F_1(2n=3x=39),hexaploid F_1 and F_2(2n=6x=78),and tetraploidF_2(2n=4x=52),of G.hirsutum(2n=4x=52)×G.raimondii(2n=2x=26),and theirparents.1).No pollen grains of the triploid F_1 germinated on its stigma;those