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Figure 1. Examples of the structural diversity observed among plant mitochondrial genomes. Based on genome-mapping data, a number of models have been developed to account for the array of genomic configurations. Many of these models have been based on certain underlying principles that may be unique to the plant kingdom, including a propensity to undergo multiple recombinations, a multipartite genome structure, and the retention of mutations derived by various aberrant genomic reorganizations. Many of these mutations are associated with the common phenotype of cms. Small boxes indicate repeated sequences and arrows indicate relative repeat orientation. Mitochondrial molecules are presented in circular form based on physical mapping data. There is, however, no definitive physical evidence that they exist in the genome as circles. Models were taken from Palmer and Shields (1984), Lonsdale et al. (1984), Fauron et al. (1990), Folkerts and Hanson (1 992), and Janska and Mackenzie (1 993).
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Source: Plant Physiol. (1994) 105: 775-780
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