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Cytoplasmic male sterility and fertility restoration in wheat are not associated with rearrangements of mitochondrial DNA in the gene regions for cob, coxII, or coxI

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Abstract

In comparing the genetic organization and exploring the molecular basis of cytoplasmic male sterility (CMS) in wheat, mitochondrial DNAs (mtDNA) from Triticum aestivum, T. timopheevi, CMS alloplasmic wheat with T. aestivum nucleus and T. timopheevi mitochondria, and fertility-restored lines were compared by hybridization analysis with specific probes for three gene regions: CoxII, cob, and coxI. Minor differences between T. aestivum- and T. timopheevi-derived sources were found for gene regions for coxII and cob. For coxI, there are significant differences between T. timopheevi-derived mtDNAs and T. aestivum mtDNA extending beyond an 8 kb distance. All T. timopheevi-derived mtDNA sources have a chimeric gene region (orf256) with part of the upstream coxI gene region, including some coxI-coding region, preceding coxI. The part of orf256 that does not include any of coxI and the 3′-flanking region of CMS coxI are not found in T. aestivum mtDNA. Neither orf256 nor the CMS 3′-flanking region of coxI are found in T. timopheevi or T. aestivum chloroplastic or nuclear DNA. There do not appear to be DNA sequence differences for the three gene regions studied that are related to either CMS or fertility-restored states.

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  1. Harold Rathburn

    Present address: Department of Botany and Microbiology, University of Oklahoma, 770 Van Vleet Oval, 73019, Norman, OK, USA

Authors and Affiliations

  1. Department of Biochemistry, Kansas State University, Willard Hall, 66506-3702, Manhattan, KS, USA

    Harold Rathburn, Jisaheng Song & Charles Hedgcoth

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  1. Harold Rathburn
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  2. Jisaheng Song
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  3. Charles Hedgcoth
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Rathburn, H., Song, J. & Hedgcoth, C. Cytoplasmic male sterility and fertility restoration in wheat are not associated with rearrangements of mitochondrial DNA in the gene regions for cob, coxII, or coxI . Plant Mol Biol 21, 195–201 (1993). https://doi.org/10.1007/BF00039632

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  • DOI: https://doi.org/10.1007/BF00039632

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