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Linkage Tests in American Pima Cotton¹

The results of 42 linkage tests involving six American Pima cotton (Gossypium barbadense L.) mutants and 15 mutants of G. hirsutum L. are reported. Forty of the tests gave no significant evidence of linkage and two tests indicated linkage. A dominant Pima male-sterile mutant (Msp) was found to be linked with one of a pair of duplicate factors for glandless (gl₁) with 9.38 ± 0.98% recombination and with naked seed (N₁) with 13.95 ± 1.89% recombination. Msp was not allelic with the dominant male-sterile genes Ms₄, and Ms₇. The gene symbol, Ms₁₁, is proposed for the character Pima male-sterility in place of the currently used symbol Msp.

Key Words: Gossypium barbadense L. • Linkage groups • Allelism

² Research geneticist and research agronomist, USDA, SEA-AR, Univ. of Arizona Cotton Res. Ctr., Phoenix, AZ 85040.

Received for publication July 17, 1978.