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  • 1
    Electronic Resource
    Electronic Resource
    Physical organization of the 18S and 5S ribosomal RNA genes in the mitochondrial genome of rye (Secale cereale L.) (1990)
    Springer
    Current genetics 17 (1990), S. 339-346 
    Details
    ISSN: 1432-0983
    Keywords: Secale cereale ; Triticum aestivum ; Ribosomal RNA genes ; Mitochondrial DNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The mitochondrial 18S and 5S ribosomal RNA (rRNA) genes of rye, plus a total of about 90 kilobase pairs of flanking DNA, have been cloned and maps of restriction enzyme cleavage sites have been constructed. Like their homologs from hexaploid wheat, the rye genes are closely linked and are part of a three-copy family of recombining repeats (the “18S/5S repeat”). The rye repeat probably also contains a mitochondrial tRNAfMet gene, which the wheat repeat is known to carry. However, despite the overall organizational similarity between the wheat and rye 18S/5S repeats in the immediate vicinity of their coding regions, extensive rearrangement of flanking sequences has taken place during evolutionary divergence of the two species. Our data provide additional support for an emerging picture of plant mitochondrial genomes as evolving much more rapidly in structure than in sequence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314882
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Polymorphism for ribosomal RNA gene arrangement in the mitochondrial genome of fall rye (Secale cereale L.) (1994)
    Springer
    Current genetics 26 (1994), S. 269-275 
    Details
    ISSN: 1432-0983
    Keywords: Secale cereale ; Mitochondrial DNA ; Ribosomal RNA genes ; Recombining repeats ; Restriction fragment length polymorphism ; Gene dosage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A restriction-fragment-length polymorphism (RFLP) in mitochondrial DNA (mtDNA) was detected between varieties of fall rye (Secale cereale L.) by Southern hybridization with rrn18, the gene encoding the mitochondrial 18S ribosomal RNA. Restriction mapping showed that the RFLP is based on differing numbers of genomic contexts (one vs three) for a recombining-repeat element (the “18S/5S repeat”). From examination of other Secale species, we conclude that the one-context state arose relatively recently, putatively by deletion of two of an ancestral set of three distinct genomic loci containing the mitochondrial 18S/5S repeat. This is consistent with our earlier conclusion that the 18S/5S repeat has probably existed in at least two genomic copies throughout much of the history of the grass family (at least 40 million years). Interestingly, the intervarietal difference in the number of distinct rrn18 loci is not accompanied by a major difference in the number of rrn18 copies per unit mass of mtDNA. This suggests the existence of a mechanism that can compensate rather precisely for differences in mitochondrial gene dosage, perhaps by over-replication or stabilization of specific subgenomic molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00309559
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    Paper (German National Licenses)
    Fulltext
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