Theoretical and Applied Genetics

, Volume 65, Issue 3, pp 181–189

Chloroplast DNA evolution and the origin of amphidiploid Brassica species

  • J. D. Palmer
  • C. R. Shields
  • D. B. Cohen
  • T. J. Orton

DOI: 10.1007/BF00308062

Cite this article as:
Palmer, J.D., Shields, C.R., Cohen, D.B. et al. Theoret. Appl. Genetics (1983) 65: 181. doi:10.1007/BF00308062


The origin and evolution of a hybrid species complex in the genus Brassica (cabbage, turnip, mustard, rapeseed oil) has been explored through mutational analysis of the maternally inherited chloroplast genome. A detailed chloroplast DNA phylogeny enables identification of the maternal parent for most of the amphidiploids examined and permits quantitative resolution of the relative time of hybridization as well as the relative divergence of the diploid parents. Contradictory chloroplast and nuclear phylogenies obtained for two accessions of the amphidiploid B. napus (rapeseed oil) lead to the hypothesis that introgressive hybridization has also figured in their recent evolution.

Key words

Polyploidy Brassica Evolution of chloroplast DNA Phylogenetic tree Restriction endonucleases 



kilobase pairs


base pairs

Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • J. D. Palmer
    • 1
  • C. R. Shields
    • 2
  • D. B. Cohen
    • 3
  • T. J. Orton
    • 4
  1. 1.Carnegie Institution of WashingtonDepartment of Plant BiologyStanfordUSA
  2. 2.Department of Vegetable CropsUniversity of CaliforniaDavisUSA
  3. 3.Department of Agronomy and Range ScienceUniversity of CaliforniaDavisUSA
  4. 4.Agrigenetics CorporationBoulderUSA

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