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Nucleic Acids Research, 1980, Vol. 8, No. 9 1999-2008
© 1980

Articles

Variations in mitochondrial DNA organisation between normal and male-sterile cytoplasms of maize

Richard D. Thompson, Roger, J. Kemble and Richard B. Flavell

Plant Breeding Institute Maris Lane, Trumpington, Cambridge, CB2 2LQ, UK

Received February 28, 1980. 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.


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