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Inheritance of Pollen Fertility Restoration in Cytoplasmic Male-Sterile Upland Cotton¹

Information regarding the inheritance of fertility restoration in cytoplasmic male-sterile cotton will be a valuable tool in commercial production of F₁ hybrid cotton seed. F₁, F₂, and testcross populations were planted in 1975 at two locations to determine the inheritance of the fertility-restoring factor in cytoplasmic male-sterile Upland cotton (Gossypium hirsutum L.). Fertility restoration in cytoplasmic male-sterile cotton is controlled by a single gene probably expressing partial dominance. Either some of the F₂ plants were misclassifled or some minor modifying factor(s) was slightly deleterious to the growth and development of fertile plants in segregating populations. G. barbadense L. apparently has a factor that enhances pollen production in the F₁ hybrid. A breeding program is underway to transfer this factor(s) into Upland stocks. Fertile plants in segregating F₂ populations showed a significantly higher lint percentage than corresponding sterile plants. Higher micronaire was found for sterile plants than fertile plants.

Key Words: Gossypium • Cytoplasmic male-sterility • F₁ hybrid • Lint percentage • Micronaire

² Graduate research assistant and associate professor of Agronomy, Univ. of Georgia.

Received for publication August 2, 1976.

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