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Nucleic Acids Research, 1986, Vol. 14, No. 14 5651-5666
© 1986

Articles

Tripartite mitochondrial genome of spinach: physical structure, mitochondrial gene mapping, and locations of transposed chloroplast DNA sequences

David B. Stren1,* and Jeffrey D Palmer2

Carnegie Institution of Washington, Department of Plant Biology 290 Panama Street, Stanford, CA 94305 1Department of Botany, University of California Berkeley, CA 94720 2Department of Biology, University of Michigan Ann Arbor, MI 48109, USA

*To whom correspondence should be addressed

Received May 19, 1986. Accepted June 20, 1986.

A complete physical map of the spinach mitochondrial genome has been established. The entire sequence content of 327 kilobase pairs (kb) is postulated to occur as a single circular molecule. Two directly repeated elements of approximately 6 kb, located on this "master chromosome", are proposed to participate in an intragenomic recombination event that reversibly generates two "subgenomic" circles of 93 kb and 234 kb. The positions of protein and ribosomal RNA-encoding genes, determined by heterologous filter hybridizations, are scattered throughout the genome, with duplicate 26S rRNA genes located partially or entirely within the 6 kb repeat elements. Filter hybridizations between spinach mitochondrial DNA and cloned segments of spinach chloroplast DNA reveal at least twelve dispersed regions of interorganellar sequence homology.


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