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陆地棉(G.hirsutum L.2n=52)生长势强、产量高、纤维长、但成熟较迟,抗病虫能力差。亚洲棉(G.arboreum L.2n=26)早熟、纤维短粗、抗病虫能力强。通过种间杂交,可以打破其遗传的稳定性,使子代产生极为广泛的分离类型,从中可选出早熟、丰产、优质、抗病虫力强的新类型和新品种。由于利间隔离、种间杂交F_o代往往不结实,多年来国内外许多学者为了克服F_o代不亲和性,提高杂交当代的结实率,做了许多试验研究工作。Weaver(1957、1958)研究了陆地棉×亚洲棉的受精和胚胎发育过程。冯午(1959)、Blacoba(1962)、胡适宜(1968)分别报道了陆地棉×亚洲棉的授粉受精过程的研究结果。Pundir(1972)作了陆地棉和亚洲棉正反交以及亲本类型的授粉、
Gossypium hirsutum L.2n = 52 had strong growth potential, high yield and long fiber length, but its maturity was late and its pest resistance was poor. Asia cotton (G. arboreum L.2n = 26) precocious, short stubble, pest resistance ability. Through interspecific crossbreeding, the genetic stability can be broken and a very wide range of segregation types can be generated in offspring. New types and new varieties with early maturity, high yield, high quality and pest resistance can be selected therefrom. Due to the isolation of interspecific hybridization, the interspecific hybrid F_o generation tends to be poor. Over the years, many scholars at home and abroad have done many experimental researches in order to overcome F_o generation incompatibility and improve the seed setting rate of hybrids. Weaver (1957, 1958) studied the fertilization and embryo development of upland cotton × asiatic cotton. Feng (1959), Blacoba (1962) and Hu Shiyi (1968) reported the results of pollination and fertilization studies on upland cotton × asiatic cotton. Pundir (1972) made the reciprocal crosses between Upland cotton and Asian cotton and their parental pollination,