title: Genetic classification of sources of cytoplasmic male sterility in maize.
mesh_terms: D003433:Crosses, Genetic; D003593:Cytoplasm; D005260:Female; D005298:Fertility; D006579:Heterozygote; D006824:Hybridization, Genetic; D007246:Infertility; D008297:Male; D009154:Mutation; D059828:Plant Cells; D011058:Pollen; D013997:Time Factors; D003313:Zea mays / Q000166:cytology