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Gene Arrangement in the Duplicate Linkage Groups V and IX: Nectariless, Glandless, and Withering Bract in Cotton¹

Genetic investigations of Upland cotton, Gossypium hirsutum L., have established that the genes controlling the expression of nectariless (ne₁, ne₂), glandless (gl₂, gl₃), and withering bract (bw₁, bw₂) are at duplicate loci in homeologous chromosomes. Three-point linkage tests in these homeologous linkage groups indicate that the gene order was probably Gl₂-Bw₁-Ne₁ in the A genome and Bw₂-Gl₃-Ne₂ in the D genome. However, recombination percentages were not significantly different between Bw₁-Ne₁ and Gl₂-Ne₁ in the A genome, and between Bw₂-Ne₂ in the D genome.

Key Words: Three-point linkage test • Recombination • Gossypium hirsutum L.

² Research geneticist, SEA-USDA, College Station, TX 77843.

Received for publication May 13, 1979.