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Classification of Male-Sterile Cytoplasms in Maize (Zea mays L.)¹

Thirty lines with male-sterile cytoplasm were backcrossed to a series of maize (Zea mays L.) inbreds. Each cytoplasm gave male-sterile plants in certain inbred backgrounds and partially or completely male-fertile plants in other backgrounds. The cytoplasms were divided into groups according to the pattern of fertility restoration observed. Each group appears to be composed of similar if not identical cytoplasms. The major groups are designated the Texas Group, the S Group, and the C Group. A fourth group (P) probably belongs to the Texas Group but may be distinct. A few sources of cytoplasm require further testing before they can be assigned to a group. C cytoplasm is assigned the permanent genetic symbol cms₃.

Key Words: Corn • Fertility restoration • Pollen

² Geneticist, Plant Science Research Division, Agricultural Research Service, US Department of Agriculture and Assistant Professor of Agronomy, University of Missouri, Columbia, Mo. 65201.

Received for publication March 20, 1971.

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