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Ribosomal DNA repeat unit polymorphism in 49 Vicia species

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DNA restriction endonuclease fragment analysis was used to obtain new information on the genomic organization of Vicia ribosomal DNA (rDNA), more particularly among V. faba and its close relatives and the taxa within three (Narbonensis, Villosa, Sativa) species' complexes. Total genomic DNA of 90 accessions representing 49 Vicia species was restricted with 11 enzymes, and the restriction fragments were probed with three ribosomal clones. Twenty-eight repeat unit length classes were identified. The number of length classes (1–2) per accession did not correspond to the number of nucleolar organizing regions (NORs). The number of rRNA genes was independent of the 2C nuclear DNA amount present in the taxon. Each of the 90 accessions had 2 (rarely 1)-4 DraI sites. Those taxa with the same number of DraI sites generally could be distinguished from each other by different configurations. Probing of the DNA samples digested with tetranucleotide recognition restriction endonucleases emphasized differences between divergent spacer regions and enabled relative homologies between the coding regions to be established. Overall, rDNA restriction site variation among the species showed a good correlation with taxonomic classification. The rDNA analysis indicated evolutionary relatedness of the various taxa within the Narbonensis species complex. rDNA diversity within two other species complexes (Villosa, Sativa), on the other hand, was more extensive than expected. With few exceptions, data on the two complexes give evidence of taxon-specific divergences not seen with other approaches. The restriction site variability and repeat length heterogeneity in the rDNA repeat exhibited startling differences between V.faba and its close wild relatives included in the Narbonensis species complex. This analysis provides new evidence that none of the species within the complex can be considered to be putative allies of broad bean.

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Correspondence to S. N. Raina.

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Communicated by J. Mackey

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Raina, S.N., Ogihara, Y. Ribosomal DNA repeat unit polymorphism in 49 Vicia species. Theoret. Appl. Genetics 90, 477–486 (1995).

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Key words

  • Vicia species
  • Ribosomal DNA
  • RFLP Diversity
  • Phylogenetic relationships