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Heterochromatin and highly repeated DNA sequences in rye (Secale cereale)

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Abstract

Secale cereale DNA, of mean fragment length 500 bp, was fractionated by hydroxylapatite chromatography to allow recovery of a very rapidly renaturing fraction (C0t 0–0.02). This DNA fraction was shown to contain several families of highly repeated sequence DNA. Two highly repeated families were purified; (1) a fraction which renatured to a density of 1.701 g/ cc and comprised 2–4% of the total genome, and (2) polypyrimidine tract DNA which comprised 0.1% of the total genome. The 1.701 g/cc DNA consisted of short sequence repeat units (5–50 bp long) tandemly repeated in blocks 30 kb long, while a portion of the polypyrimidine tract DNA behaved as part of a much larger block of tandemly repeated sequences. The chromosomal location of these sequences was determined by the in situ hybridisation of radioactive, complementary RNA to root tip mitotic chromosomes and showed the 1.701 g/cc sequences to be largely limited to the telomeric blocks of heterochromatin, accounting for 25–50% of the DNA present in these parts of the chromosomes. The polypyrimidine tracts were distributed at interstitial locations with 20–30% of the sequences at three well defined sites. The combined distributions of the 1.701 g/cc DNA sequences and polypyrimidine tracts effectively “individualised” each rye chromosome thus providing a sensitive means of identifying these chromosomes. The B chromosomes present in Secale cereale cv. Unevita, did not show defined locations for the sequences analysed. — The data are discussed in terms of the structure of the rye genome and the generality of the observed genomic arrangement of highly repeated sequence DNA.

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Authors and Affiliations

  1. Division of Plant Industry, CSIRO, P.O. Box 1600, 2601, Canberra, A.C.T., Australia

    R. Appels & W. J. Peacock

  2. Department of Agronomy, Waite Agricultural Research Institute, University of Adelaide, 5064, Glen Osmond, Australia

    C. Driscoll

Authors
  1. R. Appels
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  2. C. Driscoll
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  3. W. J. Peacock
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Appels, R., Driscoll, C. & Peacock, W.J. Heterochromatin and highly repeated DNA sequences in rye (Secale cereale). Chromosoma 70, 67–89 (1978). https://doi.org/10.1007/BF00292217

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  • DOI: https://doi.org/10.1007/BF00292217

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