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Allelic among Ragged Leaf, Heritable Abnormalities 1, 2, and 3, Veins-Fused, and Rugose Mutants in American Upland Cotton, Gossypium hirsutum L.¹

Six monogenic mutants that occurred spontaneously in Gossypium hirsutum were tested for allelism. Allelic tests were conducted among ragged leaf and Heritable Abnormalities l, 2, and 3 because of similar gene action. In all of these the mutant form is the heterozygote while the homozygote is semilethal. Veins-fused and rugose were included because of phenotypic similarities to Heritable Abnormalities 1 and 3, respectively. Ragged leaf and Heritable Abnormality 2 were independent of each other and of the other mutants. Heritable Abnormalities 1 and 3, veins-fused, and rugose were allelic and located at the crinkled-dwarf (cr) locus. Heritable abnormality I and veins-fused are phenotypically distinct from Heritable Abnormality 3 and rugose. This divergence of function is similar to that in the crinkled-dwarf alleles of G. barbadense and suggests the existence of either a complex locus or two separate loci with tight linkage.

² Research Geneticist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture.

Received for publication August 10, 1966.