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Intraspecific 5S rRNA gene variation in flax,Linum usitatissimum (Linaceae)

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A relatively large proportion of the flax genome (~ 3%) is comprised of 5S rRNA genes. This study focuses on the intraspecific sequence variation among five distinct groups of 5S rRNA genes. The results indicate that group 1 and 2 5S rRNA genes most closely resemble other angiosperm 5S genes, while groups 3–5 are highly divergent. Sequence variation is higher in the spacer region compared to the transcribed region for all pairwise comparisons. The large degree of sequence variation observed in this study is discussed with respect to genome organization and proposed models for repetitive sequence maintenance.

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Schneeberger, R.G., Cullis, C.A. Intraspecific 5S rRNA gene variation in flax,Linum usitatissimum (Linaceae). Pl Syst Evol 183, 265–280 (1992).

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Key words

  • Linaceae
  • Linum usitatissimum
  • 5S rDNA sequence
  • sequence comparisons
  • repetitive DNA
  • concerted evolution