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Variegated Mutants in Cotton, Gossypium hirsutum L.¹

Variegated plants were observed as spontaneous mutations in the cotton nurseries, as an induced mutation in a line isolated from a seed-irradiated population, and as reoccurring mutations in a genetic marker line. Genetic analysis of this mutant-condition indicated that it is maternally inherited. Observations of the segregation patterns and development of this mutant led to the conclusion that mutant plants result from plastid mutations. The influence of the environment on the expression of this mutant phenotype and the possibility of nuclear control of the plastid mutation were discussed.

Key Words: cytoplasmic inheritance • plastid mutation

² Research Geneticist, Crops Research Division, ARS, USDA.

Received for publication February 23, 1967.