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Two New Alleles at the sm₁ Locus in Cotton¹

Two new alleles were sited at the sm₁ locus of tetraploid Gossypium hirsutum L., upland cotton. One allele, derived from the wild Hawaiian tetraploid species, G.tomentosum Nutt. ex Seem., removed all trichomes from stems and most of the trichomes from mature leaves. The allele is dominant to "normally pubescent", the phenotype of most cultivars of upland cotton. The second allele steins from the Peruvian diploid species, G. raimondii Ulbr. The allele greatly enhanced density of tomentum of the upland cultivar ‘Empire,’ is dominant to "normally pubescent," and masks the expression of Sm₂ (A subgenome glabrousness allele). The finding of an allele at the sm₁ locus that enhances the density of pubescence, taken along with three other alleles at the locus that remove varying amounts of pubescence from the cotton plant, suggests that the sm₁, locus of the D subgenome is the homoeologue of the sm₂, or h₁, locus of the A subgenome which bears an assortment of alleles that produce similar effects.

Key Words: Gossypium armourianum Kearn • G. barbadense L. • G. hirsutum L. • G. raimondii Ulbr. • G. tomentosum Nutt. ex Seem. • Plant glabrousness • Trichomes

² Geneticist, USDA-ARS and professor of crop science, North Carolina State Univ., Raleigh, NC 27695-7620.

Received for publication January 19, 1984.