Genetic Resources and Crop Evolution

, Volume 48, Issue 6, pp 621–627

Introgression between oilseed rape (Brassica napus L.) and its weedy relative B. rapa L. in a natural population

  • Lise Bach Hansen
  • Hans Redlef Siegismund
  • Rikke Bagger Jørgensen
Article

DOI: 10.1023/A:1013825816443

Cite this article as:
Hansen, L.B., Siegismund, H.R. & Jørgensen, R.B. Genetic Resources and Crop Evolution (2001) 48: 621. doi:10.1023/A:1013825816443

Abstract

We investigated introgression in a mixed weedy population ofoilseed rape (Brassica napus) and itsrelative B. rapa usingspecies-specific AFLP-markers. The population wassituated in a field relayed from conventional to organic cultivation11 years ago. One-hundred-and-twoB. napus orB. rapa-like plantswere collected in a 3 m2 plot. Of these, onewas a first generation hybrid (F1) and nearlyhalf (44 plants) were introgressed, having bothB. napus andB. rapa specific markers.The remaining plants apparently corresponded to pure species, with 50having only B. rapa-and seven having only B.napus-specific markers. We compared thenumber of markers in the plants from the weedy population with thenumbers in controlled backcross generations (BC1 andBC2). The marker distribution in the weedy populationresembled the distribution in the second backcross generation mostclosely. Together with the cultivation history of the field, thissuggests that the introgression process in the weedy mixed populationhas been in progress for some time. This study is the first to showintrogression between B.napus and B.rapa under natural conditions.

AFLPBrassicaCrop-weedGene flowHybridisationTransgene spread

Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Lise Bach Hansen
    • 1
  • Hans Redlef Siegismund
    • 2
  • Rikke Bagger Jørgensen
    • 1
  1. 1.Department of Plant Biology and BiogeochemistryRisø National LaboratoryRoskildeDenmark
  2. 2.Botanical InstituteCopenhagen KDenmark