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Genetic Analysis of Leaf Differentiation Mutants in Upland Cotton¹

A series of leaf mutants in Gossypium hirsutum L. was tested for allelism and linkage, and three closely linked loci were established on chromosome 15. One locus is represented by a single mutant allele, crinkled leaf (crcr), and the other two loci are represented by a multiple allelic series. The two loci with the multiple allelic series were designated as strap leaf and veins-fused. Alleles of the strap leaf locus are rugose (s_rs_r), Lubbock-1 (s_ls_l), strap leaf (ss), norma(SS), and Heritable Abnormality-3 (S_hS_h). Alleles of the veins-fused locus are veins-fused (vfvf), normal (VfVf), and Heritable Abnormality-1 (Vf_hVf_h).From independent two and three-point linkage data, we generated a calculated four-locus linkage map as follows: cr-O.20.s-l.20-vf-4.90-Lg [Lg = Green lint] The seven mutants tested all affect leaf development. Each of the three distinct loci appeared to function differently in leaf development and differentiation in cotton.

Key Words: Multiple alleles • Linkage

² Research geneticist, ARS, USDA, Brownsville, TX 78520; research geneticist, ARS, USDA, College Station, TX 77840; and research agronomist (retired June 1973), ARS, USDA, College Station, TX 77840, respectively.

Received for publication October 8, 1974.