Cytological analysis of interspecific hybrids of cotton

The article analyzes data on the production of new intergenomic hybrids involving the species Gossypium thurberi Tod., Gossypium raimondii Ulbr., Gossypium arboreum L., Gossypium hirsutum L., Gossypium barbadense L., belonging to genome groups D1, D5 A2 cotton and presents the results of some cytological studies of the resulting hybrids. As a result of experiments using the method of interspecific hybridization, an amphidiploid {[(G. thurberi Tod. × G. raimondii Ulbr.) × G. arboreum L.] × G. hirsutum L.} with a complex genetic basis was obtained. Based on the hybridization of the resulting amphidiploid with cultivars of the species G. barbadense L. and G. hirsutum L., interspecific complex hybrids were synthesized, including 4 species with hybridization of 46.7-55.1% and including 5 species with hybridization of 24.6-31.3%.By interspecific hybridization and backcrosses, valuable source material for the cotton breeding has been created. Valuable introgressed lines having high productivity and high quality, which are at various stages of testing have been realized. Cytological analysis of the hybrids revealed that they were true interspecific crosses. Observations of meiotic metaphase chromosomes indicated the degree of relatedness between species.