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Conversion of a RAPD-generated PCR product, containing a novel dispersed repetitive element, into a fast and robust assay for the presence of rye chromatin in wheat

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Bulk segregant analysis was used to obtain a random amplified polymorphic DNA (RAPD) marker specific for the rye chromosome arm of the 1BL.1RS translocation, which is common in many high-yielding bread wheat varieties. The RAPD-generated band was cloned and end-sequenced to allow the construction of a pair of oligonucleotide primers that PCR-amplify a DNA sequence only in the presence of rye chromatin. The amplified sequence shares a low level of homology to wheat and barley, as judged by the low strength of hybridization of the sequence to restriction digests of genomic DNA. Genetic analysis showed that the amplified sequence was present on every rye chromosome and not restricted to either the proximal or distal part of the 1RS arm. In situ hybridization studies using the amplified product as probe also showed that the sequence was dispersed throughout the rye genome, but that the copy number was greatly reduced, or the sequence was absent at both the centromere and the major sites of heterochromatin (telomere and nucleolar organizing region). The probe, using both Southern blot and in situ hybridization analyses, hybridized at a low level to wheat chromosomes, and no hybridizing restriction fragments could be located to individual wheat chromosomes from the restriction fragment length polymorphism (RFLP) profiles of wheat aneuploids. The disomic addition lines of rye chromosomes to wheat shared a similar RFLP profile to one another. The amplified sequence does not contain the RIS 1 sequence and therefore represents an as yet undescribed dispersed repetitive sequence. The specificity of the amplification primers is such that they will provide a useful tool for the rapid detection of rye chromatin in a wheat background. Additionally, the relatively low level of cross-hybridization to wheat chromatin should allow the sequence to be used to analyse the organization of rye euchromatin in interphase nuclei of wheat lines carrying chromosomes, chromosome segments or whole genomes derived from rye.

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Communicated by K. Tsunewaki

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Francis, H.A., Leitch, A.R. & Koebner, R.M.D. Conversion of a RAPD-generated PCR product, containing a novel dispersed repetitive element, into a fast and robust assay for the presence of rye chromatin in wheat. Theoret. Appl. Genetics 90, 636–642 (1995). https://doi.org/10.1007/BF00222127

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Key words

  • Wheat
  • Rye
  • RAPD
  • PCR
  • In situ hybridization
  • Dispersed repeat