Allele Determining Rugate Fruit Surface in Cotton.

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 Glr 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. Glr 3 was transferred to two stocks of G. barbadense L. where the allele also produced densely glanded, rugate fruit surface.