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Chromosome Pairing in Triploid F₁ and Hexaploid F₁, F₂, and F₃ Generations of Gossypium Hirsutum L. x G. Sturtianum Willis¹

Chromosome pairing was studied in the triploid F₁ and the hexaploid F₁, F₂, and F₃ generations of Gossypium hirsutum L. (AD genome) x G. sturtianum Willis (C genome) hybrid. Pairing in the hexaploid forms in each generation was essentially homogenetic indicating that the transfer of agronomic characters between genomes by conventional breeding methods for cotton improvement would be difficult.

Key Words: Interspecific hybrid • Homogenetic pairing • Heterogenetic pairing • C genome • AD genomes • Wild diploid species • Cotton

² Assistant professor, Departamento de Fitotecnia, Centro de Ciências Agrarias-Universidade Federal do Ceará, Brazil; professors and associate professor, Dep. of Agronomy and Plant Genetics, The Univ. of Arizona, Tucson, AZ 85721, respectively.

Received for publication March 22, 1975.