title: Variations in mitochondrial DNA organisation between normal and male-sterile cytoplasms of maize.
abstract: Mitochondrial DNA from male-sterile lines of maize carrying S cytoplasm contains two small DNA species which are absent from N (fertile) and other male-sterile cytoplasms. Portions of these species have been purified and amplified by constructing recombinant plasmids in vitro. Probes made with these plasmids have been used to demonstrate; i) a homologous region in the N mitochondrial genome, which may indicate the origin of the S specific DNA species. ii) two other DNA species present in low amounts in S cytoplasm only. iii) the absence of strong homology to the S specific DNA species in mitochondria from C and T male-sterile cytoplasms.
mesh_terms: D003593:Cytoplasm / Q000378:metabolism; D004247:DNA / Q000235:genetics / Q000378:metabolism*; D005796:Genes; D008928:Mitochondria / Q000378:metabolism*; D008970:Molecular Weight; D003313:Zea mays / Q000235:genetics / Q000378:metabolism*
chemical_list: D004247:DNA