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Duplicate Linkage of Glandless and Nectariless Genes in Upland Cotton, Gossypium hirsutum L.¹

We developed a phenotypic classification system to identify several nectary genotypes in cotton, Gossypium hirsutum L. Duplicate linkage groups were established between the glandless genes, gl₂ and gl₃, and the nectariless genes, ne₁ and ne₂. The linkage value for gl₂-ne₁ in linkage group V in the A genome was 32.23 ± 1.40% crossover units and the linkage value for glones in linkage group IX in the D genome was 38.27 ± 1.40% crossover units. The establishment of these linkages marks these two chromosomes so that three-point linkage tests may be conducted to establish the gene order of the duplicate genes for glandless, nectariless, and withering bract.

Key Words: gossypol • inheritance • pigment • glands

² Formerly Agricultural Research Technician, Crops Research Division, ARS, USDA (present address, Agronomy Department, Purdue University, Lafayette, Ind.

³ Research Geneticist, Crops Research Division, and Adjunct Associate Professor of Crops, Mississippi State University; and Research Entomologist, Entomology Research Division and Adjunct Associate Professor of Entomology, Mississippi State University, respectively, both of the Boll Weevil Research Laboratory, ARS, USDA, State College, Miss. 39762.