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The structure, amount and chromosomal localisation of defined repeated DNA sequences in species of the genus Secale

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Abstract

The structure, copy number and chromosomal location of arrays of four families of highly repeated sequences have been investigated in representative species of the genus Secale. The four unrelated families, previously characterised in Secale cereale, have repeating units of 480, 610, 630 and 120 base pairs respectively. The following general conclusions can be drawn in addition to detailed knowledge of the sequence content of heterochromatin in each accession studied: (1) Every species is unique in its complement or chromosomal distribution or both of the four highly repeated sequence families. S. montanum and S. cereale accessions studied here show the same complement of repeated sequences, but they differ substantially in the amounts they contain of the 610 and 630 base pair (bp) families, and in the distribution over the chromosomes of the 480 bp family. The structure of the repeating unit is also different in many members of the 480 bp family in S. montanum. — (2) The substantial differences between species in the amounts of the most highly repeated DNA sequences exist in the absence of any such conspicuous differences in most other repeated sequences which were detected as fluorescent bands after restriction enzyme digestion and gel electrophoresis. — (3) Each of the different highly repeated families can exist independently of the other families, though all the families have telomeric sites. Also, in the outbreeding species, heteromorphisms are frequent, and are particularly conspicuous in hybridisation detecting the 480 bp sequence family. — (4) The association of the highly repeated sequences with heterochromatin, discussed in the accompanying paper is generally true for other species in the genus, and the lower amounts of heterochromatin in other Secale species compared to S. cereale are associated with lower amounts of specific families of highly repeated DNA sequences. — (5) Analysis of highly repeated sequence families is likely to provide an easy method of identification of new accessions of Secale.

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Jones, J.D.G., Flavell, R.B. The structure, amount and chromosomal localisation of defined repeated DNA sequences in species of the genus Secale . Chromosoma 86, 613–641 (1982). https://doi.org/10.1007/BF00285607

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