Abstract
THE first hybrid between Asiatic and New World cottons (n = 13 xn = 26) was recorded and described by Zaitzev.1, 2, 3 The parentage of this cross was Gossypium herbaceum (female) by G. hirsutum (male), and the resulting plants were, without exception, completely sterile on both female and male sides. Other workers have since confirmed Zaitzev's results. Desai4 obtained a single plant of similar parentage to that described by Zaitzev. This plant was also sterile. He states that the pollen was successfully used on both parents. More recently, Vycotski5 again produced hybrids between G. herbaceum and G. hirsutum which were sterile when self-pollinated and when back-crossed to the parents. Nakatomi6 reported a hybrid in which the New World type (n = 26) was used as female. He found complete sterility of the hybrid, which he ascribed to irregular chromosome behaviour in meiosis.
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