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Generally Gossypium hirsutum and G. barbadense flowers are chasmogamous. A true-breeding, cleistogamous line was derived from the F2 population of an interspecific cross between G. hirsutum and G. barbadense.  The inheritance of cleistogamy was studied in F1 and F2 generations of two crosses.  Cleistogamy is a variable character that changes with genotypic background and environmental factors or time of flowering.  The results suggest that cleistogamy is governed by a single recessive gene in the G. hirsutum upland background with indications that modifying factors influence the expression of cleistogamy.  A preliminary test showed no apparent deleterious effect due to the cleistogamous trait on agronomic performance in upland cotton.

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