Nuclear control of mitochondrial genome reorganization characterized usingcultured cells of ditelosomic and nullisomic-tetrasomic wheat lines

In vitro-mediated reorganization of the mitochondrial genome is governed by information contained in the nuclear genome. Here we show, from the study of tissue cultures initiated from an almost complete collection of diteloso mic and nullisomic-tetrasomic wheat lines, that nuclear control of the mito chondrial genome structure is a highly complex process. Whereas information responsible for the amplification of defined molecular configurations has been found to be located in either a single or a few chromosomal arms, othe r rearrangements such as changes in the relative amounts of interconverting subgenomic structures are governed by a number of genes scattered over mos t of the wheat chromosomes.