Genetic diversity of oilseed Brassica napus germ plasm based on restriction fragment length polymorphisms

B. W. Diers, T. C. Osborn

Research output: Contribution to journalArticlepeer-review


Oilseed rape (Brassica napus) is an important oilseed crop worldwide. Cultivars have been developed for many growing regions, however little is known about genetic diversity in B. napus germ plasm. The purpose of the research presented here was to study the genetic diversity and relationships of B. napus accessions using restriction fragment length polymorphisms (RFLPs). Eighty three B. napus accessions were screened using 43 genomic DNA clones which revealed 161 polymorphic fragments. Each accession was uniquely identified by the markers with the exception of the near-isogenic cvs 'Triton' and 'Tower'. The RFLP data were analyzed by cluster analysis of similarity coefficients and by principal component analysis. Overall, there were three major groups of cultivars. The first group included only spring accessions, the second mostly winter accessions and the third, rutabagas and oilseed rape accessions from China and Japan. These results indicate that within B. napus, winter and spring cultivars represent genetically distinct groups. The grouping of accessions by cluster analysis was generally consistent with known pedigrees. This consistency included the grouping of lines derived both by backcrossing or self-pollination with their parents.

Original languageEnglish (US)
Pages (from-to)662-668
Number of pages7
JournalTheoretical and Applied Genetics
Issue number6-7
StatePublished - Aug 1 1994
Externally publishedYes


  • Brassica napus
  • Genetic diversity
  • Oilseed rape
  • Restriction fragment length polymorphism

ASJC Scopus subject areas

  • Biotechnology
  • Agronomy and Crop Science
  • Genetics


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