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A Genetical Scheme for Isolating Cotton Cultivars¹

When the diploid cotton (Gossypium davidsonii Kell.) species, is crossed with cultivars of the tetraploid species, G. hirsutum L. and G. barbadense L., the hybrid embryos abort, or the seedlings become necrotized and moribund shortly after germination. A complementary lethality intereaction is indicated, the cultivated cottons contributing the factors Le₁ and Le₂, whereas G. davidsonii contributes at least one factor, Le^dav.

A rare genotype in G. barbadense is le₁le₁le₂le₂. Crosses between plants of this genotype and G. davidsonii yield viable triploids. Using the technique of hexaploid bridging, I transferred Le^dav from G. davidsonii to the cross-compatible stock, 15-4. The resulting stock—genotype le₁le₁le₂le₂Le^davLe^dav—is not cross-compatible with a series of cultivars of G. hirsutum and G. barbadense.

Utilizing the le and Le^dav alleles, I produced stocks of G. hirsutum that proved to be genetically isolated from a series of G. hirsutum cultivars under both greenhouse and field conditions. The use of the le - Le^dav genetical system for isolating cotton cultivars grown for special purposes, such as gossypol-free seeds, is discussed.

Key Words: Gossypium barbadense L. • Gossypium davidsonii Kell. • Gossypium hirsutum L. • Complementary lethality • Glandless cotton • Hybrid cotton • Species hybrids

² Geneticist. AR-SEA-USDA, and professor of crop science, North Carolina State Univ., Raleigh, NC 27650.

Received for publication September 2, 1980.