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Nucleic Acids Research, 1989, Vol. 17, No. 18 7345-7357
© 1989

MOLECULAR BIOLOGY

Three copies of a single recombination repeat occur on the 443 kb mastercircle of the Petunia hybrida 3704 mitochondrial genome

Otto Folkerts and Maureen R. Hanson

Section of Genetics and Development, Cornell University Ithaca, NY 14853, USA

Received May 15, 1989. Revised August 14, 1989. Accepted August 14, 1989.

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


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