Genetic Analysis of Fiber Color Variants in Cotton.

Although white is the most common color of fiber in Upland cotton (Gossypium hirsutum L.), some lines display brown lint fibers, and others have green lint. Some cottons have white lint and green fuzz. Eleven lines with brown lint, one with green lint and fuzz, and two with white lint and green fuzz were tested for allelism against known genes for lint color, and for chromosomai location of lint color loci. All lines displaying green lint and/or fuzz proved to be alleles at the Lg locus. The green fuzz allele was designated Lg1. Four of the brown-linted lines proved to carry alleles at the Lc2 locus, and four alleles at the Lc2 locus. A dark brown phenotype was imparted by an allele at a new locus, Lc5. The Lc5 locus proved to be linked with another locus, Lc5, which harbors alleles for light brown lint color. Alleles at Lc4 and Lc6 also impart light brown lint color.