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Plant Mitochondrial DNA: Unusual Variation on a Common Theme

  • Arnold J. Bendich
Part of the Plant Gene Research book series (GENE)

Abstract

There are two unusual features of the plant mitochondrial genome that seemingly distinguish it from the mitochondrial genome in all other eukaryotes. First, the size of the genome is very large — embarassingly so — and can be extremely variable even among closely related species. And second, the circular DNA molecules obtained from plant mitochondria are not easily related to the size of the genome as inferred from reassociation kinetics measurements or from restriction enzyme analyses. The circles are heterogeneous in size, do not approach the size of the genome inferred from the other methods, and do not amount to more than a few per cent of the molecules obtained from mitochondria of intact plant tissues, although they can be obtained in much greater yield from cultured cells. The unusual properties of the circles have led to the speculation that the mitochondrial genome in plants is organized differently than it is in other eukaryotes with the genes borne on different linkage groups of chromosomes, as is found in the nucleus (discussed in Bendich, 1982). The large size of the genome has led to the suggestion that there may be more — perhaps many more — genes in plant mtDNA than in mtDNA of other eukaryotes (Leaver and Gray, 1982; Grivell, 1983; Levings, 1983; Hack and Leaver, 1983). It will be the purpose of this article to briefly review the information concerning genome size and DNA circularity for plant mitochondria and to ask whether the limited data for plants do in fact point to a fundamental genetic difference between the mitochondria of plants and other eukaryotes.

Keywords

Mitochondrial Genome Linear Molecule Plant Mitochondrion Circular Molecule Unusual Variation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag/Wien 1985

Authors and Affiliations

  • Arnold J. Bendich
    • 1
  1. 1.Departments of Botany and GeneticsUniversity of WashingtonSeattleUSA

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