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Allele Determining Rugate Fruit Surface in Cotton¹

Rugate fruit surface in cotton (Gossypium hirsutum L.) is accompanied by dense glandulosity and correlates with increased terpenoid aldehyde level in flower buds. Rugate carpellary surface is determined in M. J. Lukefahr's XG-15 line by the allele Gl^r ₃ in the homozygous state acting in conceit with an array of other gland-determining alleles at other loci. A sister line, 3-T, is homozygous for Gl₃, an allele having little or no capacity to impart rugate fruit surface. Gl^r ₃ was transferred to two stocks of G. barbadense L. where the allele also produced densely glanded, rugate fruit surface.

Key Words: Cotton • Terpenoid aldehyde • Gossypol • Gossypium barbadense L.

² Geneticist, ARS, USDA, and professor of crop science.

Received for publication August 8, 1977.