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Linkage Relationships between Le and Gl Alleles in Cotton¹

The major leaf-gland alleles of cotton, Gossypium hirsutum L., Gl₂ and Gl₂, were shown to be linked with the complementary lethality alleles, Le₁ and Le₂. Linkage between Gl₂ and Le₁ was estimated at 27.5 ± 2.8 centimorgans, and linkage between Gl₃ and Le₂ was estimated at 22.9 + 2.2 centimorgans. Because the complementary lethality allele from G. davidsonii Kell., Le^dav is also linked with the gl₃ locus of Gossypium, the question arose as to whether or not Le,^dav and Le₂ are alleles at a common locus. Direct methods of testing are not possible inasmuch as combining the two alleles in a zygote results in the death of the embryo, or the plant, stemming therefrom. However, indirect results as well as reconstruction of probable pathways in the evolution of alleles at the le loci in various Gossypium taxa led to the tentative conclusion that Le₂ and Le_dav although antagonistic in combination, are alleles at a common locus.

Key Words: Gossypium anomalum Wawra x Wawra and Peyr. • G. arboreum L. • G. barbadense L. • G. davidsonii Kell. • G. herbaceum L. • G. klotzchianum Andress. • G. hirsutum L. • G. sturtianum J. H. Willis • G. stocksii Mast. in Hook. • Complementary lethality • Duplicated linkage

² Geneticist, USDA-ARS and professor of Crop Science, North Carolina State Univ., Raleigh, NC 27650.

Received for publication October 23, 1981.