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Quantitative variation in components of the maize mitochondrial genome between tissues and between plants with different male-sterile cytoplasms

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Summary

The amounts of a 1.9 kb mitochondrial plasmid relative to sequences in another mitochondrial DNA replicon and also to nuclear ribosomal DNA sequences have been compared in maize leaves and anthers. Similar comparisons have been made between plants with the same nuclear genotype but containing normal, S, or T cytoplasms. The ratio of 1.9 kb plasmid to nuclear rDNA is lower in plants with normal cytoplasm than in plants with S or T cytoplasm. It also differs between leaves and anthers. Furthermore, the relative concentration of the mitochondrial DNA sequences belonging to different replicons differs between leaves and anthers. It is concluded that components of different mitochondrial replicons are not maintained in fixed ratios during development and that the concentration of the 1.9 kb plasmid is regulated, in part, by cytoplasmically-inherited determinants. The 1.9 kb plasmid is absent from lines with the Vg cytoplasm, but related sequences are found in the maize nuclear genome.

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  1. A. G. Abbott

    Present address: Biology Department, Brown University, Providence, Rhode Island, USA

Authors and Affiliations

  1. Plant Breeding Institute, CB2 2LQ, Trumpington, Cambridge, U.K.

    A. G. Abbott, M. O'Dell & R. B. Flavell

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  1. A. G. Abbott
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  2. M. O'Dell
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  3. R. B. Flavell
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Abbott, A.G., O'Dell, M. & Flavell, R.B. Quantitative variation in components of the maize mitochondrial genome between tissues and between plants with different male-sterile cytoplasms. Plant Mol Biol 4, 233–240 (1985). https://doi.org/10.1007/BF02418241

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  • DOI: https://doi.org/10.1007/BF02418241

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