Figure 3. Gene order and existed clusters between the mitochondrial gene maps of Gossypium and other four angiosperms.

Gene order of the protein-coding and rRNA-coding genes, and the former's trans-spliced exons were based on the mt genome of G. hirsutum arranging from top to bottom. Genes of other four mt genomes were indicated by the corresponding numbers given to cotton genes listed on the left margin. Duplicate genes carried the same number. From left to right for (A) C. papaya, (B) R. communis, (C) A. thaliana and (D) Z. mays.