以四个栽培棉种为材料，通过种间杂交，产生了栽培棉种间二元、三元和四元杂种。对各材料叶片横切面结构研究表明，草棉与亚洲棉为等面叶，陆地棉与海岛棉为背腹叶，而各多元杂种均表现为等面叶，这一结果可用于多元杂种的早期鉴定。对各材料减数分裂的研究表明，二倍体的二元杂种（亚洲棉×草棉）Ｆ１联会成１１个二价体和１个四体环，四倍体的二元杂种主要联会成２６个二价体，而各多元杂种联会成大量的单价体和多价体。从而引起后期Ⅰ染色体分离混乱，并产生大量的异常四分体，造成多元余种的高度不育。 Using four cultivated cotton species as materials, interspecific binary, ternary and quaternary hybrids of cultivated cotton species were produced by interspecific hybridization. The cross-sectional structure of leaf of each material showed that cottonseed and Asian cotton were isofacial leaves, and both G. hirsutum and G. barbadense were dorsal-ventral leaves, while all the multivariate hybrids showed isodial leaves. This result could be used in the early stage of multivariate hybrids Identification. Studies on meiosis of various materials showed that the diploid bipartite hybrid (Asiatic cotton × cottonseed) F1 complex formed 11 divalent and one tetracyclic rings, and the tetraploid binary hybrids were the main associations Into the 26 bivalent body, and the multiple hybrids Association into a large number of monovalent and multivalent body. Resulting in late chromosome I chromosome confusion, and produce a large number of abnormal tetrad, resulting in a variety of highly sterile species.