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Restriction mapping studies reveal that the mitochondrial genome of white mustard (Brassica hirta) exists in the form of a single circular 208 kb chromosome. The B. hirta genome has only one copy of the two sequences which, in several related Brassica species, are duplicated and undergo intramolecular recombination. This first report of a plant mitochondrial DNA that does not exist in a multipartite structure indicates that high frequency intramolecular recombination is not an obligatory feature of plant mitochondrial genomes. Heterologous filter hybridizations reveal that the mitochondrial genomes of B. hirta and B. campestris have diverged radically in sequence arrangement, as the result of approximately 10 large inversions. At the same time, however, the two genomes are similar in size, sequence content, and primary sequence.

Unicircular structure of the Brassica hirta mitochondrial genome