Localization of syntenic sequence blocks of mitochondrial genomes in other crops. Sequence blocks showing synteny (>2 kb, > 95%) between a CMS line and a different line were depicted as blue-green color. mtDNAs of CMS lines were used as the reference genome in each comparison. Distribution of repeated sequences (>100 bp, > 95%) in CMS lines is shown with brown bars and boxes. The CMS-associated genes in each crop are indicated above the alignments. Sequence blocks and repeated sequences are depicted in two layers to show the direction and length.