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At 443 kb, the map of Petunia hybrida line 3704 mitochondrial DNA is the largest yet produced from a dicot plant. Regions of similarity to known plant mitochondrial genes and to the chloroplast genome have been placed on a master circle. One long repeated sequence, apparently active in recombination, is present in three copies. Two copies of 6.6 kb occur in a direct orientation and are separated by 199 kb. A third truncated copy of 3.5 kb is inverted relative to the other two and is separated from the others by 99 and 145 kb. The presence of the recombination repeats predicts a multipartite molecular organization, consisting of four master circles and three subgenomic circles. Two other repeated regions were found not to be substrates for, or products of recombination. The absence of recombination at certain reiterated regions indicates that there is specificity of recombination at the recombination repeats.

Three copies of a single recombination repeat occur on the 443 kb mastercircle of thePetunia hybrida3704 mitochondrial genome