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Pollen Abortion in Relation To Cytoplasmic-Genetic Male Sterility in Sorghum¹

Preliminary data which seemed to indicate gametophytic control of pollen abortion in cytoplasmic-genetic male sterility led to the following study. Using the standard iodine method for counts of pollen grains, pollenabortion was determined on two A lines, three B lines, nine presumed fertility restorers, and the F₁'s of the A lines )x restorer. In addition, four backcross progenies involving A lines and restorers were classified as to sterility or fertility by seed set under bag. Data were also recorded in the backcrosses for seed color in relation to sterility. These studies failed to support the idea of gametophytic control. Sporophytic control by the restorer gene was further indicated by approximate 1:I ratios of fertility to sterility in the backcrosses. Other explanations of the data are suggested to be the effect of the environment on sterility, meiotic irregularities in crosses between lines of diverse origin, multiple modifying genes for fertility restoration, and cytoplasmic particles.

² Professor of Agronomy and Associate Professor of Botany and Plant Pathology.

Received for publication May 24, 1966.