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Inheritance of Gossypol Level in Gossypium. IV. Results from the Reciprocal Exchange of the Major Gossypol-Gland Alleles Between G. hirsutum L. and G. barbadense L.¹

Cultivars of Gossypium barbadense L. commonly assay 2.00 to 2.50% terpenoid aldehydes (gossypol and methoxgossypol) in dried meals from whole seeds, whereas Upland cultivars of G. hirsutum L. commonly average 1.00 to 1.50%.G landlesss eeds of both species are virtually free of gossypol. Using glandless stocks as recipient parents, the gossypol-gland alleles of the two species, Gl₂ and Gl₂ were exchangedr eciprocally using the G. hirsutum cultivar, ‘Empire’, and the G. barbadense stock, AS-2 Sea Island, as donors. AS-2 made homozygous for alleles from Empire averaged about the same level of gossypol in seeds as the control (2.06% vs. 2.10%). Empire made homozygous for AS-2 alleles likewise stabilized near its control (1.20% vs. 1.23%). Neither of the introgresseed monomeric stocks (Gl₂Gl₂gl₃gl₃ and gl₂gl₂Gl₃Gl₃) showed parity of expression between the gossypol-gland alleles characteristic of "pure" G. barbadense. Rather, both showed the G. hirsutum type of expression wherein the Gl₂ monomeric stores 2.5 to 3.0 times as much terpenoid substances as the Gl₃ monomeric The high-terpenoid G. hirsutum stock, however, 3-T, showed a nearparity level of the substances between its monomerics after introgression with AS-2 alleles. No cytoplasmic effects were detected.

Key Words: Terpenoid aldehyde • Additive genetic variance • Epistatis variance • Cytoplasmic effects

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

Received for publication August 18, 1977.