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Reciprocal Maintainer-Restorer Relationship between A₁ and A₂ Sterile Cytoplasms Facilitates Millet Breeding¹

The reciprocal maintainer-restorer relationship found to exist between the maintainers for A₁ and A₂ sterile cytoplasms in pearl millet, Pennisetum typhoides (Burm.) Stapf and C. E. Hubb., appears to be a new phenomenon in plants. Through this relationship, maintainer Tift 23DB₁ for cytoplasmic male-sterile Til't 23DA₁ will restore fertility in cytoplasmic male-sterile Tift 239DA₂; and maintainer Tift 239DB₂ will restore the fertility of Tift 23DA_1. Population Y, containing plants with A₁ cytoplasm and their maintainers, and population Z, containing plants with A₂ cytoplasm and their maintainers, used in breeding systems such as reciprocal recurrent selection, will facilitate the development of superior F₁ hybrids.

Key Words: pearl millet • Penniselum typhoides • cytoplasmic male-sterility • reciprocal recurrent selection

² Research Geneticist, Crops Research Division, ARS, USDA, and the University of Georgia, College of Agriculture Experiment Stations, Coastal Plain Station, Tifton, Ga.; and Assistant Director, International Rice Research Institute, Los Banos, Laguna, The Philippines (former Professor and Head, Department of Plant Breeding, Punjab Agricultural University, Ludhiana, India); respectively.

Accepted for publication March 27, 1968.