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Comparison of RFLP and RAPD markers to estimating genetic relationships within and among cruciferous species

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Restriction fragment length polymorphism (RFLP) and random amplified polymorphic DNA (RAPD) markers are being used widely for evaluating genetic relationships of crop germplasm. Differences in the properties of these two markers could result in different estimates of genetic relationships among some accessions. Nuclear RFLP markers detected by genomic DNA and cDNA clones and RAPD markers were compared for evaluating genetic relationships among 18 accessions from six cultivated Brassica species and one accession from Raphanus sativus. Based on comparisons of genetic-similarity matrices and cophenetic values, RAPD markers were very similar to RFLP markers for estimating intraspecific genetic relationships; however, the two marker types gave different results for interspecific genetic relationships. The presence of amplified mitochondrial and chloroplast DNA fragments in the RAPD data set did not appear to account for differences in RAPD- and RFLP-based dendrograms. However, hybridization tests of RAPD fragments with similar molecular weights demonstrated that some fragments, scored as identical, were not homologous. In all these cases, the differences occurred at the interspecific level. Our results suggest that RAPD data may be less reliable than RFLP data when estimating genetic relationships of accessions from more than one species.

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Communicated by A. L. Kahler

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Thormann, C.E., Ferreira, M.E., Camargo, L.E.A. et al. Comparison of RFLP and RAPD markers to estimating genetic relationships within and among cruciferous species. Theoret. Appl. Genetics 88, 973–980 (1994). https://doi.org/10.1007/BF00220804

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Key words

  • DNA
  • RFLP
  • RAPD
  • Brassica
  • Genetic relationships