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Hexaploid Cotton: Some Plant and Fiber Properties¹

Hexaploid cottons were made by crossing Gossypium hirsutum L. (Acala 44-10-1) and Gossypium sturtianum Willis. The chromosome number of the sterile interspecific hybrids was doubled with colchicine. The hexaploids were selected and grown for several years. Fiber and spinning data were collected for the first time from plants having more than 52 chromosomes. The hexaploid cotton fibers produced yarn with very high yarn strength.

Key Words: Interspecific hybrid • Colchicine treatment • Doubling of chromosome number • Hexaploid cotton • Fiber properties • Spinning performance • Gossypium

² Associate Plant Breeder, Plant Breeding Department, The University of Arizona, Tucson 85721.

Received for publication April 11, 1968.

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