Genetics, Vol 124, 423-428, Copyright © 1990

INVESTIGATIONS

The Mitochondrial Genome Organization of a Maize Fertile cmsT Revertant Line Is Generated Through Recombination Between Two Sets of Repeats

CMR. Fauron, M. Havlik and RIS. Brettell
Howard Hughes Medical Institute, University of Utah, Salt Lake City, Utah 84132

The mitochondrial genome (mtDNA) organization from a fertile revertant line (V3) derived from the maize cytoplasmic male sterile type T (cmsT) callus tissue culture has been determined. We report that the sequence complexity can be mapped on to a circular ``master chromosome'' of 705 kb which includes a duplication of 165 kb of DNA when compared to its male sterile progenitor. Associated with this event is also a 0.423-kb deletion, which removed the cmsT-associated urf13 gene. As found for the maize normal type (N) and cmsT mitochondrial genomes, the V3 master chromosome also exists as a multipartite structure generated by recombination through repeated sequences.

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